Installation Manual
Contents
1. A gt ta lt 2 spacing between all refrig lines Comp Location Vapor Lines 1 2 EE O aN SISK FRONT VIEW RIGHT SIDE VIEW Door J A oor 48 3 E 7 i CUCUTE BACK VIEW LEFT SIDE VIEW Page 19 17 Feb 00 Maritime Geothermal Ltd Maritime Geothermal Ltd Revision 4 35 Color Caissie Grey Energy Module DX Heat Pumps Models EMDX 45 65 Style Horizontal Date June 1998 Drawn By G Kaye Title Refrigerant Circuit Diagram f w ty Self Contained Direct Expansion 2 ORDIC Energy Machine Energy Collector Direct Expansion Energy Receiver Copper Earth Loop K Energy Transfer Heat Pump M gt Domestic Hot Water 6 Supply Return CLD i 4 Vertical Boreholes or Optional Air Coil Fan and Circ Horizontal Trench Pump for Ducted Systems Heating 3 O N Receiver Full Capacity Domestic Hot Water Exchanger gt 4 x 4500 watt electric elements US Compressor Accumulator gal tank The Energy Machine simpilifies the installation of a DX to Water heat pump since it contains all mechanical components required for a typical in2. between R and D activates the domestic hot water circulator v Floor Circ relay coil pump Q Domestic Circ relay cail Page 29 17 Feb 00 Maritime Geothermal Ltd NORDIC EMDX HW Series Electrical Box 208v 3 60 Box Heating amp Domestic Hot Water Versions Maritime Geothermal Ltd EM Series Heat Pumps Electrical Box Connection Diagram C ommon R hot T hermostat D omestic Hot Water SET Rance Electronic Temperature Contra EREEREER EE 5 una a ae a a ee io iii ee all I NOTE A Electric Heat 1 Electric Heat Back up is 1 Breaker amp Relay An option which can be l I activated or deactivated by I A A A the customer by discon l l elf e l ol necting the breaker as re 0 0 0 0 0 0 i i I el oul on quired To disconnect per I Te w manently remove wires out Floor Cie 1 D E amp Fat left l l Relay Circ Relay I I i Pump System Voltages I 208v 3 60 Compressor i Gee ae 120v 1 60 Circulators i G 208v 1 60 Hot Water Elements l eat Compressor g Gnd l pakeg Circuit Breaker a BE m al E ae ll l ls O Neutral D Hiah 00 7 L1 Phase 1 Ig D FE 2 Phase 2 pt TLDs 3 Phase
3. Maritime Geothermal Ltd NORDIC models EM DX 45 55 65 Direct Expansion Energy Module Heat Pumps Table of Contents Heat Pump System Requirements Conceptual Overview Technology Explanation Installing DX linesets Inside Installation Domestic Hot Water Refrigerant Filled Copper Heat Exchanger Loop Hot Water Output Maritime Geothermal Ltd P O Box 413 Email nordic atcon com Petitcodiac N B E0A 2H0 www discribe ca nordic 17 Feb 00 Maritime Geothermal Ltd A NORDIC Direct Expansion Heat Pump System Energy Input Solar Geothermal Storage System Earth s Mass HEATING Extr action amp COOLING Rejection System EM heat pump Heat Distribution Infloor Heating Fan Coil Distribution Infloor Heating Fan Coil NORDIC DX Ducted Energy Module Er Systems AL Maritime Geothermal I td 17 Feb 00 NORDIC EM DX System Prerequisites There are four specific parts or sub systems to a EMDX heat pump installation oo to 7 Horizontal a Fields 17 7 The successful application of a EMDX heat pump depends on sizing ssa the machine cor s irectly for the Ss viding enough land area or vol ume of earth from i which to extract or reject heat JEMDX heat pumps react with the earth much like a conven tional reversing heat pump a
4. 5 Domestic Water In lt Domestic Water Out z Main Hot Water Out i lt Main Hot Water In if A Liguid Lines U m M i Vapor Lines N Expansion Valves 40 Gal Stainless Distribution Tank Electric Heat Elements 3 x 3KW EMDX Front Side rpn gt u m gt i m r Ranco 2 stage Digital Aguastat A Compressor Contactor Right Electric Heat Contactor Left Electric Heat Breaker Left Compressor Breaker Right Main Power Terminal Block Floor Circulator Compressor Accumulator Page 1 17 Feb 00 Maritime Geothermal I td NORDIC Series EMDX 45 55 65 HW A A A Oo a m m A Feb 00 Page 18 Maritime Geothermal I td 17 Feb 00 Maritime Geothermal Ltd Revision 4 35 Color Caissie Grey EM Direct Expansion to Water Heat Pumps Models EMDX 45 65 Style Horizontal Date Feb 1999 Drawn By G Kaye Title Piping Electrical amp Dimensions NOTE Electrical supply enters from left side through knockouts as shown 26 gt 41 K gt A Door Door al Door Domestic OUT 3 4 5 Thermostat Domestic IN 3 4 Knockout 23 i c S A Floor Out 1 N Floor IN 1 x N Yas 48 1 09 Knockout A q aA AAA A O 88 knockout Tank Location Height 38 Diameter 20
5. by opening the 24v circuit between R and T or the electrical supply to the unit is broken by open ing the heat pump breaker and then closing it again If one of these controls trips there 1s a serious problem with the system and it must be rectified if the unit is to maintain good service Electrical The NORDIC unit is supplied with an opening for 19 mm conduit nipple on the right side of the unit An additional 13 mm knock out is also supplied to accommodate accesso ries which may be attached to the heat pump s relays such as circulator pumps etc Above the accessory knock out is an other 9 mm hole for the thermostat wire which controls the circulator pump A wiring diagram is located on the electrical box cover for quick reference and although the connections to be made are quite simple Maritime Geothermal Ltd recom mends that a properly qualified electrician be retained to make the connections and wire the thermostat Starting the Heat Pump BEFORE starting the heat pump the following areas should be rechecked to assure proper operation 1 Check all high voltage field wiring and electrical connec tions inside the control box for good connection 2 Turn on the main power switch The Ranco 2 stage aq uastat stagel setpoint is set to 110 F with a 10 F differ ential from the factory Stage2 of the aquastat is factory set at 100 F with a 5 F differential This means that the unit will cycle on stagel and st
6. 3 S Connect R amp T to bring on floor circulator Connect R and D to turn ob domestic hot water circulator eae Page 30 Maritime Geothermal I td 17 Feb 00 LIMITE D W AR R ANTY MARITIME GEOTHERMAL LTD warrants that the heat pumps manufac tured by it shall be free from defects in materials and workmanship for a period of 1 ONE YEAR after the date of installation or for a period of 1 ONE YEAR AND 60 SIXTY DAYS after the date of shipment whichever occurs first In addition MARITIME GEOTHERMAL LTD warrants that the compressor shall be free of defects in materials and workmanship for an additional period of 48 FORTY EIGHT MONTHS from said date MARITIME GEOTHERMAL LTD shall at it s option repair or replace any part or parts covered by this warranty which shall be returned to MARITIME GEO THERMAL LTD transportation charges prepaid which upon examination proves to be defective in materials or workmanship Replacement or repaired parts and components are warranted only for the remaining portion of the original warranty period This warranty is subject to the following conditions 1 The NORDIC heat pump must be properly installed and maintained in ac cordance with MARITIME Geothermal LTD s installation and maintenance instruct ions 2 The installer must complete the Installation Data Sheet have it endorsed by the owner and return it to Maritime Geotherma
7. heating and cooling projects Vertical Liquid to Air Liquid to Liquid V za U TRS BAR RXN RANA BAX RAX RANA XX KXRRXRANRY XRAXRX PASAY KAKAA KKK XARA ERX KX RAXRAN RANG SAX RAXRAXRA RANK KANOE AN RK AXA wy KZ Horizontal Slim Liquid to Air Split Systems NORDIC Environmentallysound solutions to today s Heating and Cooling needs Page 32
8. insure adequate oil re turn During cooling mode the machine automatically selects one or more loops based on discharge pressure to act as the condenser As the discharge pressure builds to a predeter mined point the on board computer selects the most appropri ate combination of groundloops to dissipate the heat at the lowest cost to the homeowner By intelligently controlling the manner in which the condenser is utilized our total system charge does not have to be altered nor does an excess charge have to be stored anywhere EMDX Better than Current Technology There are several advantages of EMDX technology that are superior to conventional geothermal heat pumps of both the open loop and closed loop variety Listed below are some of the reasons why EMDX technology is becom ing more attractive to Homeowners Dealers and Utilities More Reliable e Fewer parts to the system e Does not require a supply and return well e Does not require a well pump or circulation pumps No water heat exchanger and associated valving to cor rode freeze and break More Efficient The direct expansion principle allows the refrigerant to come directly into contact with the earth separated only by copper tubing During winter maximum heat transfer takes place at higher temperature than conventional groundloop technology without the maintenance and electrical cost of cir culation pumps Less Maintenance Only a
9. operates all its internal pumps and circulators automatically 3 Because the condenser of the heat pump is built into the distribution tank there is no need for an intermediate water loop and associated pump system This integration saves the first cost of the circulation pump and the costs of operating and maintenance on the pump over the years 4 The maximum output water temperature can be up to 52 C 125 F whereas a conventional water to water heat pump will normally have a maximum output temperature of 46 C 115 F 5 A conventional heat pump can only supply hot water dur ing regular floor heating cycles unless there is an auxiliary heat exchanger installed The EM has a heat exchanger em bedded 1n the tank which can produce domestic hot water year around 6 The EMDX has fewer moving parts than a conventional heat pump and requires no servicing or maintenance of any kind 7 A two point connection to the floor header system is all that 1s required 8 External back up boiler or electric hot water tank is not re quired since the EM tank is equipped with 9 15 Kw of back up electric heat prewired and activated as the second stage of a 2 stage digital aquastat 9 The integrated storage tank 1s fabricated from type 316 Stainless Steel which will last the life of the building 10 The EM is controlled with a digital 2 stage thermostat with individually adjustable setpoints and differentials First and second stages wi
10. sealed refrigeration circuit to maintain More Versatile EMDX systems can be installed in a more confined area than a conventional groundloop system primarily because the heat exchanger coil is much more efficient at transferring heat Page 7 17 Feb 00 Maritime Geothermal Ltd Piping Layout of Vertical Style DXW Vertical Loop Typical 5 ton 5 loop Vertical System Another possible borehole layout with one possible borehole layout Home Infloor Heat HP Schrader Valve Pressure Gauge 7 H m gt lt 76 mm or larger borehole 30 m pre made loops of 9 mm NT liguid line and 13 mm vapor line copper tubing Dp Spacers Charge to nitrogen 9 mm copper Check pressure again before tubing inserting into borehole and after NI 13 mm OD tubing incefti m f r 2A 7 Loops can be taken to jobsite Spacer in coiled up formation and then a Assembly uncoiled just before insertion Boreholes should be backfilled up to approx 10 m from the surface with 6 mm pea gravel thereafter to into borehole the surface with bentonite clay 5 7 cm x 13 mm 22 mm Stub Cap Polyet
11. side of the loop to start unrolling first To begin unroll approximately 4 m of copper tubing Slide three 2 m lengths of armaflex closed cell insulation with wall thickness of at least 13 mm over the end of the tubing and insert it through the plastic sleeve of hole 1 approxi mately 20 cm into the basement It 1s good practice to label this line loop I gas to identify it when interconnecting linesets inside the building Unroll the copper tubing down one corner of the trench When 53 m of tubing has been laid out make your turn and proceed back the other side of the trench to the foundation of the building Slide two 2 m lengths of armaflex insulation onto the tubing and insert the stub end through hole 2 in the wall to match the other end of the loop Label this end of the line loop I liquid so that the complete loop can be identified later Manually backfill the loop with fill to a depth of 15 cm for protection during the machine backfill process Duplicate the process described above applying labels to identify the two ends of successive loops loop 2 3 4 etc until all required loops are in place Insulation Placement Near Foundation It is important to apply closed cell insulation to the copper groundloops as they come within 3 m of the building to pre vent the possible build up of ice near the foundation of the home Applying 13 mm wall closed cell waterproof insulation to the tubing as described above will insure that ve
12. to be large enough to accommo date all the loops required in the system The copper tubes should have a spacing of at least 2 m minimum A wider spac ing would lead to slightly greater efficiency Page 17 Feb 00 Entering dwelling The copper groundloops must enter the dwelling at some location typically through the concrete foundation just above the poured floor An alternate method would be to run the pipe insulated up the outside wall making a 90 degree turn above ground and entering the dwelling between the floor joists just below the first floor These pipes should be insu lated with a minimum of 13 mm closed cell weatherproof in sulation There will be two 13 mm OD copper tubes for each nominal ton of capacity of the heat pump being installed For example a 3 ton unit would have 3 groundloops and thus 6 ends to go through the concrete wall We recommend that you drill these holes to a diameter large enough to allow for the insertion of a plastic sleeve see drawing and the tubing with it s insulation jacket Suitable measures must be taken to seal the installation from water penetration before the trench is backfilled Unrolling amp Placing the Tubing Each 15 m roll of tubing is taped both individually and to the next roll in the group so that at any one time only 15 m of the 107 m is free to unroll This allows for easier unrolling and prevents kinking the pipe Observe how the taping is done so that you know which
13. transfer of heat from the ground by means of a secondary heat exchanger system and working fluid e g wa ter which is pumped to the geothermal unit located in the heated structure The conventional heat pump has it s own internal primary heat exchanger which extracts heat heating mode or rejects heat cooling mode from this water which is then pumped back to the earth to be reheated or cooled EMDX systems similarly use a ground coil system how ever the working fluid is a refrigerant and the copper ground loop is the primary heat exchanger Such geothermal heat ex change 1s an efficient and effective way of achieving heat ex change 1n heating and air conditioning systems and especially heat pump type systems Since the ground temperature is rela tively constant at 7 at a depth 2 m below the frost line the available heat is constant The elimination of the secondary earth heat exchanger typically plastic in nature and its associated working fluid reduces the temperature difference required between the ground and the evaporating refrigerant yielding a higher suc tion pressure than a conventional system under similar cir cumstances and thus a higher efficiency Many attempts have been made in the past to develop suc cessful direct coupled heat pumps for residential and commer cial uses These attempts have failed adequately to meet a number of requirements associated with an economically and functionally viable system S
14. water Circulator pump not operating Heat pump not operating Switch set to OFF Valves shut off draw tion Blockage or restriction in the Check water flow and power to Use an amprobe to measure current Observe any shut off valves for loca Replace if faulty Remove obstruction in water water line or hot water heat pump Check water lines for obstruc lines Acid treat the domestic hot exchanger tion Thermostat if equipped is Check contact operation Should open close at 40 C and open at 45 C Electric Disconnect switch open or Check both line and load sides of Elements in breaker open in electrical sup fuses or breakers If switch or Storage Tank ply to heat pump breaker is open determine why not operating water coil Replace thermostat if faulty Replace blown fuse or breaker or close switch Electric element breaker inside Check voltage at elements with mul Reset breaker electric panel of heat pump timeter Check for grounded or open shut off element Second stage of aquastat on Visually inspect the setting Readjust the setting to 40 C hot water tank set too low Temporarily adjust the setting up to Should be set at 38 to 40 C see if the elements engage In line Flowmeter Page 23 The Dole flow control is a simple self cleaning device designed to deliver a con stant volume of water from any outlet whether the pressur
15. If comp is hot this may take several hours Ohmmeter shows reading when placed across R and S terminals and infinity between C amp RorC amp S Make sure the internal overload has had time to reset Voltage on line side with contactor held closed but no voltage on one or both terminals on the load side Points pitted or burned Compressor attempts to start but trips it s internal overload after a few seconds Check with ohmmeter for shorts open etc Page 21 Check for blown fuse at heat pump s disconnect box or blown fuse Determine why the disconnect switch was opened if all is OK close the switch Replace fuse with proper size and type Time delay type D Check total load on system Call power company Determine cause and replace motor If windings are open or overload 1s faulty replace compressor Replace contactor Attempt to rock compressor free If normal operation cannot be estab lished replace compressor Replace if faulty 17 Feb 00 Compressor not Open control circuit operating Intermittent contact in elec trical control circuit Compressor short cycles Unit trips off on LOW suction pressure control HEATING Faulty low pressure ctrl Faulty TXV s Aguastat setting too high Eg Above 50 C 122 F TXV stuck closed Filter drier plugged No or low water in tank Unit trips off on HIGH pres control HEATING The
16. age2 when first powered up 3 Turn on the water supply to the hot water lines and check all plumbing for leaks 4 Check the hot water tank to be sure it is filled with water before energizing the circuit Slightly open the pressure relief valve on the top of the hot water tank to make sure that all air is out of the system and the circulator pump is flooded with water 5 Vacuum out any dust and debris that may have collected in the unit during installation 6 Make sure the proper time delay fuse or breaker has been installed in the electrical panel 7 Have the following tools on hand and know how to use them A refrigeration gauge set Pace 17 Feb 00 An electronic or other accurate thermometer Anamprobe 1 Connect your refrigeration gauge set 2 Turn on the power to activate the system The Ranco ag uastat will display the temperature in the tank and if be low the setpoint S1 and S2 will be displayed in the LCD window and the compressor will start 3 Observe the readings on the high and low pressure gauge set With an initial earth temperature of 7 to 10 C the suction pressure blue gauge should be approximately 315 to 400 kPa while the head or discharge pressure red gauge should be in the area of 1350 to 1900 kPa Record this information on the warranty test card 4 The temperature on the aquastat should show a steady rise as the internal distribution tank warms up As the
17. bing cleaned amp dehydrated suitable for the job Every ef fort must also be made to insure that the tubing does not be come contaminated during installation We recommend that caps be placed on the open ends of tubing immediately after cuts are made and that these caps are only removed after all bends have been made and the pipe fixed 1n its permanent lo cation ready to make the silver soldered joints It is very im portant to keep a refrigeration system perfectly clean and dry therefore removing the caps just prior to silver soldering will insure that the tubing 1s exposed for a minimal time to the at mosphere and the associated moisture contained therein Insulating linesets All tubing inside the basement must be insulated with 9 mm wall armaflex or equivalent insulation to prevent conden sation and sweating during winter operation Silver soldering linesets Once all the tubing runs have been routed insulated and fastened in place the caps can be removed couplings applied or alternately the tubing can be swaged and the joints sil ver soldered with 5 silfos NORDIC absolutely requires that dry nitrogen be bled through the system during all silver soldering procedures so that no oxidation occurs on the inside of the copper tubing Vacuuming system When silver soldering is finished the entire system should be pressurized to 700 kPa with dry nitrogen and all joints Page 17 Feb 00 made by the installer check
18. cludes the following components eCompressor earth heat exchanger or provision for DX connection to the ground eInsulated 40 gal 316 SS distribution tank with integrated refrigerant condenser and domestic hot water generator eExpansion tank PRV Boiler feed valve pressure gauge electronic 2 stage aquastat e12 kw back up heat eFloor distribution circulator pump Standard Taco 0011 or you spec head and volume e All controls prewired and ready to use With a typical water to water HPmost of these components were outside the heat pump and had to be procured and in stalled by the plumber Page 17 Feb 00 Energy Machines are superior to a built up system in the following ways 1 Installed first cost is cheaper 2 Building controls are simpler requiring less control points 3 Higher efficiency 4 Hotter output temperature 5 Year around domestic hot water capability 6 Fewer moving parts less maintenance 7 Simple integration to an infloor heating system 8 Back up heat built in 9 Stainless Steel storage tank 10 Accurate temperature regulation 1 Cost of purchasing the individual components and building the mechanicals on site are higher than purchasing an inte grated package such as the NORDIC EM 2 Costs associated with the control points in a building man agement system are also reduced since the machine only has to be put in the ON or OFF mode requiring point The energy machine
19. e in the boreholes provides very uniform conduc primarily for heating will have no problem with conduction tion both winter and summer and heat transfer since it will be cooling the loop during heat ing mode Cooling the soil draws moisture towards the coils since they are colder than the surrounding ground Horizontal a et gd loop fields should be laid out so that the copper coils have a a if f if eae 1 TI af it min good cross sectional influence on the minimum areas listed in a i Hit A m o A a GE iii al ji Ww ar 1 M SL I 111 p A J nnam i EMDX 45 3 x 106 1 3 x 53 ml EMDX 55 4 x 106 1 3 x 53 m EMDX 65 5 x 106 1160 m 1 3x53m Note These are minimum loop field requirements based on an earth temperature of 7 C Table 1 Page 3 17 Feb 00 Maritime Geothermal Ltd NORDIC EMDX Series Typical Plumbing HOT Water OUT to home 2 v Domestic l HOT Water 2 O 7 Tank iz Ze SS er Check V Va DX copper lines to outdoor loops gt 4 Q 1 3 14 zone valves or telestats ZONE 1 ZONE 4 ZONE 2 ZONE 3 Page 4 Maritime Geothermal I td Introduction to EMDX Technology Direct earth coupled heat pump or EMDX heat pump is one that has its refrigerant evaporator condenser in direct thermal contact with the earth from which heat 1
20. e is 15 psig or as high as 125 psig The controlling mechanism con sists of a flexible orifice that varies it s area inversely with pressure so that a constant flow is maintained 17 Feb 00 Maritime Geothermal Ltd Heating Mode Btu s Comp Comp Suct Disch EWT LWT Flow Out Amps Watts Watts COP Pres Pres 100 109 9 10 29556 19 4 3640 4045 4 3 88 282 100 108 9 10 53285 18 7 3489 3896 4 0 75 100 108 6 10 51532 l 3393 3803 4 0 68 100 108 1 48670 3296 3697 l 62 100 107 6 45594 l 3178 3584 i 57 100 107 3 43956 l 3129 3543 54 100 106 3 38008 2963 3378 45 100 106 35919 2877 3301 Water flow in IGPM Temperatures in F Btu s per Hour Coefficient of Performance Ground Temperature Deg F Page 24 Maritime Geothermal I td 17 Feb 00 Heating Mode Soil Btu s Comp Comp Blower Blower TOTAL Suct Disch Temp HAB EWT Flow Out Amps Watts Amps Watts Watts COP Pres Pres 70 60745 100 10 70897 23 0 4780 3 4 318 5089 4 1 84 302 60 50181 100 10 61739 20 7 4356 3 5 325 4673 3 9 12 55 46173 100 10 58374 4132 3 5 4447 3 0 65 50 42875 100 10 53868 l 3943 3 4 4288 3 7 60 45 38208 100 10 49602 3764 3 4 4083 3 6 54 40 35795 100 10 46611 3594 3 5 3923 3 5 50 35 31942 100 10 42399 l 3410 3 6 3738 3 3 44 29447 40126 l 3256 3581 Water flow in IGPM Temperatures in F Btu Output Ground Temperature in Deg F Page 25 17 Feb 00 Maritime Geo
21. ed for leaks using soap suds or some other technique that the installer feels comfortable with It is important not to bypass this step since vacuuming the system with a leak will be impossible and attempting to do so will introduce moisture to the system making the process take much longer to vacuum after the leak has been found and re paired Vacuum the system until the reading on an electronic vac uum gauge stays below 500 microns for a period of 5 minutes after the vacuum pump is shut off and the system sealed Charging system Once the system has been vacuumed refrigerant can be added by weighing in 1 3 of the prescribed refrigerant charge into the low side of the system Start the heat pump in the heating mode and continue to add refrigerant as a liquid at a rate of no more than 5 kg per minute until the prescribed charge is reached Alternately before the machine is started the entire charge can be weighed into the system through the high side schrader valve Hot Water Connections Connection to the hot water generator feature of the heat pump is accomplished by teeing into an electric or oil fired hot water tank with a capacity of 180 litres minimum A typical piping diagram is shown elsewhere in this manual Be sure to note the position of the check valve and the direction of water flow One should be sure the tank 1s filled with water and is under pressure before activating the heat pump to insure proper lubrication of the c
22. floor heating installation with full capacity domestic hot water The contractor need only connect to the supply in and out water lines and the control wiring for the internal circulator pump to have a fully functional system Infloor Heating Headers or Fan Coil Units EMDX 45 HW EMDX 55 HW EMDX 65 HW Min Circuit Ampacity 21 15 61 with 50 Elec back up Recommended Wire Size 3 10 3 10 3 6 3 10 3 3 6 3 6 3 3 3 6 3 TD Fuse or Breaker 20 30 50 00 A 00 100 00 18 3 thermostat wire for all Page 20 eco SS J N N Er Uo Maritime Geothermal I td 17 Feb 00 NORDIC EMDX Heat Pump Trouble Shooting Compressor not Power Failure operating Disconnect switch open Fuse blown Low voltage Burned out motor Thermal overload on com pressor tripped Faulty compressor contactor Seized compressor due to locked or damaged mecha nism Faulty run capacitor Electric circuit test shows no voltage on the line side of compressor con tactor Voltmeter shows no voltage on the line side of the compressor contactor At heat pump disconnect box volt meter shows voltage on the line side but not on the load side Voltmeter shows abnormally low voltage Below 210 v at heat pump disconnect switch Ohmmeter shows no resistance be tween common and run terminals or between common and start terminals Note Be sure compressor overload has had a chance to reset
23. heat exchanger supports Materials supplied by NOR DIC NORDIC sup a plies the EMDX heat pump with all internal valv ing and header ing pre assembled pres sure tested and ready to be installed to the customers infloor system and un derground copper exchanger loops The underground coil as semblies can be purchased with the unit pre tested and sealed with 700 kPa nitrogen pressure A EMDX system may comprise from 2 to 5 underground loops One loop is required for each nominal ton of compressor capacity The standard loops are 13 mm OD type L or K copper tubing When the dealer unpacks the coils the integrity of the loops can eas ily be checked by attaching a suitable pressure gauge to the 6 mm schrader valve on the coil assembly The pressure read at room temperature should be approx 700 kPa 30 kPa If a loop is not within this tolerance it should be set aside for re testing or returned to NORDIC for replacement Under no circumstances should a copper groundloop be used if there is any question that it may not be pressure tight The EMDX heat pump es unit has been high pres sure tested for leaks and has a holding charge of 200 kPa nitrogen when the dealer receives it i gt Materials you will i need inside CSO A lineset is required to u connect the heat pump to the underground coils which will be installed outside the structure This lineset con sists
24. hly when it arrives Optimum Placement The location of liquid to water heat pump inside the home should be determined by 1 The ease at which piping runs can be connected to the infloor heating headers on the output side of the unit 2 Space availability in a mechanical room for the hot water distribution tank and associated pumps etc 3 Ease of access to the water well supply and discharge lines or groundloop lines If possible the four main service doors should remain clear of obstruction for a distance of 6 m so that servicing and gen eral maintenance can be carried out with a minimum of diffi culty Raising the heat pump off the floor a few inches is generally a good practice since this will prevent unnecessary rusting of the bottom panel of the unit We recommend that the heat pump be placed on a piece of 50 mm Styrofoam covered with 6 mm plywood The Styro foam will smooth out any irregularities in the cement floor while the plywood will distribute the weight of the NOR DIC unit evenly over the Styrofoam This process will also deaden the compressor noise emitted from the bottom of the cabinet As an alternative several pieces of 50 mm lumber can be placed under the unit running from the electrical connection 17 Feb 00 side to the filter rack side of the heat pump Laying the wooden pieces in this manner will give the best support since they will be at right angles with the internal steel compressor and
25. hylene Pea gravel is used for backfilling material because it copper Ny pipe Wire tie allows any water that may be in the borehole to Tok in a figure 8 circulate freely thus improving the heat transfer _ fashion characteristics of the hole ee a The bentonite clay seals the top 10 m of the hole from surface contamination thus posing no problem to the aquifer Maritime Geothermal I td to the refrigerant than a plastic earth exchanger Normal loop lengths for a EMDX machine are nominally 107 m per ton as opposed to 140 to 150 m per ton for a plastic earth ex changer Similarly vertical systems require only a 75 mm borehole to a normal depth of 30 m per ton Easier to sell Systems can be guoted more accurately and easily since there 1s less outside subcontracting involved Excavation or drilling contractors know in advance what is required and can quote definite prices whereas with well drilling for open loop systems the well price may eliminate the sale entirely Installation Instructions Unpacking When the heat pump reaches it s destination it should be unpacked to determine if any damage has occurred during shipment Any visible damage should be noted on the carrier s freight bill and a suitable claim filed at once The heat pump is strongly constructed and every effort has been made to insure that it will arrive intact however it is in the customer s best interest to examine the unit thoroug
26. ible AT configuration for a horizontal DX piping system Each loop should encompass about 230 m to 325 m of land area per ton of heat pump Fach loop consists of 107 m of 13 mm copper tubing The pit could be a excavated area or an existing area which needs to be filled as part of general excavation Loops should be buried approxi mately 2 m underground for best performance Example 25m Nordic DX 45 should have 3 loops as shown at left a DX 55 4 loops and a DX 65 5 loops Other configurations would work as well such as a 15 x 15 m pattern or a 18 x 14 m etc The object 1s to encompass at least the minimum area mentioned above with spacing no closer than 2 5 m between any two pipes Home Page 14 Maritime Geothermal I td if the refrigerant evaporating pressure drops below 20 psig Some possible causes for a trip out on low pressure are 1 Ruptured or broken groundloop coil 2 Low refrigerant charge 3 Other refrigerant leak 2 High pressure control The second safety control is a high pressure safety limit which monitors compressor discharge pressure This device will not normally trip unless 1 There is low or no water in the internal tank 2 Aquastat is set too high Above 53 C If either of these controls trips it will activate a lock out relay which prevents the unit from restarting until power to the con trol circuit is broken
27. irculator pump Slightly loosen the copper union on the hot water discharge pipe to allow air to escape from the system before the unit is started This step will make certain that the water circulator is flooded with wa ter when it is started Since the pump is water lubricated damage will occur to the pump if it is run dry for even a short period The union on the discharge water line may have to be purged of air several times before good circulation is ob tained A hand placed several feet down the line will sense when the water is flowing The thermostats on the hot water tank should be set to 38 C since the heat pump will transfer energy via an in ternal heat exchanger from the main internal tank normally maintained at 45 C By setting the tank thermostats as de scribed the heat pump will try to keep the tank above the cut in point of the electric element settings thus generating hot water from the heat pump only During periods of high demand the electric elements could energize to help make hot water Safety Controls The NORDIC heat pump has two built in safety controls which are designed to protect the unit from situations which could damage it 1 Low pressure control The low pressure control is designed to shut the unit down 13 17 Feb 00 Maritime Geothermal Ltd NORDIC EMDX Pit Heat Exchanger Layout ONE LOOP PER TON REQUIRED S 3 m 3 m aj 3 m aj Diagram at left shows another poss
28. l Ltd within 21 days after the in stallation of the unit 3 It is the responsibility of the building or general contractor to supply tempo rary heat to the structure prior to occupancy These heat pumps are designed to pro vide heat only to the completely finished and insulated structure Start up of the unit shall not be scheduled prior to completion of construction and final duct installation for validation of this warranty If the heat pump manufactured by MARITIME GEOTHERMAL LTD fails to conform to this warranty MARITIME GEOTHERMAL LTD s sole and exclusive liability shall be at it s option to repair or replace any part or component which is returned by the customer during the applicable warranty period set forth above pro vided that 1 MARITIME Geothermal LTD is promptly notified in writing upon discovery by the customer that such part or component fails to conform to this war ranty 2 The customer returns such part or component to MARITIME GEOTHER MAL LTD transportation charges prepaid within 30 thirty days of failure and 3 MARITIME GEOTHERMAL LTD s examination of such component shall dis close to it s satisfaction that such part or component fails to meet this warranty and the alleged defects were not caused by accident misuse neglect alteration 1m proper installation repair or improper testing Page 31 17 Feb 00 Maritime Geothermal Ltd Maritime Geothermal Ltd has the solution for all your
29. lines must be insulated from the heat pump to approx 1 m down the drop pipes in the vertical boreholes Install spacers to keep the pipes separated as far as possible from one another in the boreholes Install 30 to 35 m of dual tubing 13 mm vapor amp 9 mm liquid Re check pressure on lines Secure pipes through opening in borehole head Backfill with pea gravel to 10 m from top Seal hole with ben tonite clay from 10 m to surface Most commercial installations will require tremie grouting of the bore hole from bottom to top with bentonite with 28 to 30 solids Install linesets from well heads in horizontal trenches to heat pump in building Silver braze all joints with 5 silver solder using dry nitrogen to purge the system When all joints are complete pressurize the entire system with 1000 kPa nitrogen and recheck for leaks Vacuum until system stays below 500 microns for five minutes after vacuum pump has been shut off Charge the prescribed amount of refrigerant through the high side schrader valve located on the front of the machine 22 mm Stub Cap Copper Page 6 Maritime Geothermal I td Refrigeration Cycle The general refrigeration cycle of our EMDX machine is similar in nature to a conventional water to air or water to water heat pump in that there exist a compressor expansion device reversing valve and refrigerant to air heat exchanger Conventional technology concerned with heat pumps re lies upon the
30. ll not overlap unless set to do so 17 Feb 00 Maritime Geothermal Ltd NORDIC Vertical EMDX Typical Loop design NOTE Layout for one borehole shown below Actual installation re quires one borehole per ton I E 3 holes for a EMDX 45 4 holes for a EMDX 55 and 5 for a EMDX 65 a mene ate NORDIC DX Energy Module Heat Pump 1 Line 2m Insulate liquid line to here 35 m max L Spacers ae A Pinch around pipes and silver braze Keep pipes up 13 mm off bottom to insure good flow Mh Vapor Line SH J lt Trench NOTES Drill vertical bore to a depth of 30 to 35 m Pre assemble or construct on site the dual 9 and 13 mm piping assem bly required Seal both ends and pressurize with 1000 kPa nitrogen for leak checking Silver brazing a schrader valve in the end of the 9 mm line will allow gauge checking for loss of pressure Check for leaks with soap suds After a minimum 2 hr waiting period recheck the line for loss of pressure If the temperature of the loop hasn t changed then the pressure should be same as it was originally Insulate both liquid lines and vapor lines from the heat pump to the well head unless in separate horizontal trenches Vapor lines in separate horizontal trenches need only be insulated from 3 m out in the trench to the basement wall Liquid
31. lso describe a heat cool system If your system is heat only or heat and hot water then skip over the cooling description sections 4 Ton System Description Heating Mode All NORDIC EMDX systems utilize multiple earth loops to transfer heat to and from the ground One loop per ton of capacity is normally required and during the heating mode all the loops are active Liquid refrigerant passes from the air handler section through the bi flow filter drier and through the cooling TX valve which 1s fully open by virtue of it s equalizer line being 15 17 Feb 00 connected to the common suction inlet line and it s controller bulb attached to the vapor inlet line hot in heating mode of the air handler Liquid refrigerant then travels towards the liq uid line header solenoid valve and check valve assembly So lenoid valve A is a normally open valve and is de energized during the heating mode thus refrigerant can travel unre stricted through the heating check valves B C D E towards the inlet of all the heating TX valves Each heating TX valve is equipped with a small bypass capillary tube which allows approximately 1 2 ton of refriger ant to flow regardless of the position of the TX valve This by pass is intended to perform 2 functions Limits the amount of hunting done by the TX valve due to the long evaporator length Prevents the heat pump from tripping out on a high pres sure limit if all the heating TX val
32. nd splicing 22 gauge 2 con ductor copper wire in place Regular telephone wire can be used for this op Mounting Holes Conduit Opening eration 24v Power Connection Stage 1 rela Stage 2 relay Stage 1 o Stage 2 NC NO C NC C NO Page 28 Maritime Geothermal I td 17 Feb 00 NORDIC EMDX 45 55 65 HW Series Schematic 208v 3ph 60Hz l l l I I 1A i l hn 16 2 I l f l T3 I i IA I 1s I I f is is 0 oe iv po fe ic Z 10 to ro I 1 TI l l i i a i z i i M I ot Comp Relay L eee I I na L3 T3 Na r Heater Element T2 Heater Element 120v Domestic T1 Circ Pump Heater Element Domestic Circ Relay ump Electric Heat Relay Greyed Circled Items Optional 120v Floor 0 IL Circ Pump 62 ui Floor P mp Relay 208v Thermostat Wiring Control transformer 40 va eee 24v Common C Ranco Thermostat m Floor stat T R C oe SSS I Electric Heat relay coil Domestic stat D i a a Stage 1 Stage 2 S69 S6 3 14 NC O NC H 7 A dry contact closure 3 a Lock out relay between R and T eee oe pees Sees i S activates the floor I circulator pump a NA A gt High P A dry contact closure Comp relay coil SOLEN CS Mole
33. nd closed loop plastic earth heat exchanger Heat that is available to the unit must travel through the earth and therefore the conduction capability of the earth in the lo cation of the heat exchanger is very important A unit used The source of energy ceeeceeccceccccceceeceeeesseseeeeees The stotag TIC ssa iosi anou bosa up inani Converting the energy to a useable form Distributing the heat 2 0 eeeeeeseceeceeeeeeeeeeeeeeees Solar amp Geothermal The Earth s mass ee re Heat Pump NA TO O Hot Water radiant slab fan coils Table 1 As a general rule wider spacing between the loops so that they do not influence one another will result in im proved performance of the heat pump Unless you are sure there will be sufficient moisture pre sent in the loop field area during the summer a soaker hose is recommended in all horizontal trench systems which will used for air conditioning purposes Vertical Bore Systems Vertical bores 76 mm x 30 m holes provide an alter nate method of installing a EMDX unit A high water table in Nordic EMDX 45 will heat up to 140 m Nordic EMDX 55 will heat up to 200 m Nordic EMDX 65 will heat up to 260 m Assuming at least R 20 walls and R 40 ceiling the borehole area 6 to 9 m will insure that there is adequate conduction with the earth and although the loop length per ton is shorter than the horizontal design the vertical orientation and moistur
34. ng for a small degree of error by the excavator operator Take special care that the bottom of the trench is kept as smooth as possible to reduce the chance of pinching or crushing the cop per tubing when backfilling the trench If rocky conditions are encountered 1t 1s recommended that the bottom of the trench especially the corners where the pipe will lay be covered by hand with limestone tailings or some other heavy dense ma terial to provide a relatively smooth resting place for the cop per pipe Unlike plastic pipe the copper tubing will stay where you put it when unrolled rather than arguing with you as plastic does on a cool day Once the pipe has been un rolled and placed backfilling by hand to a depth of 152 mm with fill as described above will ensure that the pipe 1s pro tected from falling rock etc during the machine backfilling procedure Other excavating devices such as a ditch witch chain dig ger or a regular back hoe can be used if ground conditions permit however you will have to dig a U shaped trench with spacing 2 to 3 m We have found that the greater speed of the tracked excavator in most soil conditions and the fact that you only have to dig one trench which 1s excellent width for a man to work in more than compensates for it s extra rental or operational costs An alternative technique for burying the underground cop per tubing would be to dig a large shallow pit with a bull dozer This pit would have
35. of one 9 mm liquid line and one 13 mm gas line for each ton or loop installed The dealer will be required to silver braze 5 silfos the required indoor linesets from the point of entry to the basement or installation area to the heat pump Horizontal Trench Requirements The EMDX heat pump requires one ground coil or loop per nominal ton of capacity Trenching for the EMDX heat pump can be best accom Page 9 17 Feb 00 Maritime Geothermal Ltd NORDIC EMDX Horizontal Trench Design Elevation View Za Next trench line Next trench line 1 8 m Backfill 15 cm or more by hand with heavy dense material if excavated material might damage the ubing 13 mm Type Type L or K copper pipe placed in each corner fee IMPORTANT NOTES Horizontal style pipe runs should be placed 1 8 m deep x minimum of 1 3 m wide trench as shown above Hand backfilling in the area just over the copper pipe is recommended to prevent crushing or pinching of the pipe during backfilling operations Individual trenches 1 per ton should be spaced a minimum of 3 m apart to allow the best performance of the groundfield Install a Soaker hose in all trenches as per the diagram to assist in initial compaction around the copper loops and also to heat conductive moisture to the ground during cooling modeif required by the system Experience has shown that groundloop fields with the piping laid in a relatively ho
36. ome of the shortcomings 1n cluded 1 Inadequate oil return to the compressor primarily in the heating mode 2 Inadequate evaporator length and spacing for properly extracting heat from the earth resulting in low capacity and low efficiency of the systems 3 Refrigerant charges in the range of 10 times greater than a similar capacity conventional geothermal heat pump 4 Approximately 3 times as much refrigerant required in the cooling mode as 1s required in the heating mode 5 Lack of a proper means to store additional refrigerant re quired during the cooling operation but not needed during the heating mode 6 Inefficient and ineffective method to account for vastly varying condenser capability depending on ground tem perature 7 Difficulty in providing an easy to install system of earth exchanger loops The NORDIC solution has been to start with a clean new concept and to design a unit from the ground up We started by developing an evaporator system that would yield the best performance to pressure drop factor and which would impact enough area to maintain a minimum suction pressure above 276 kPa The current horizontal groundloop comprises 17 Feb 00 107 m per ton of 13 mm OD copper tubing A 3 ton system would have 3 such loops working in parallel during the heat ing mode Refrigerant charge had been determined to be 1 8 kg of refrigerant per loop These 13 mm copper loops main tain sufficient velocity at all times to
37. point mode Then press either the UP key to increase or the DOWN key to decrease the setpoint to the desired temperature Step 6 Press the SET key again to access the stage2 differential The LCD will display the cur rent differential and the DIF 2 an nunciator will be blinking on and off to indicate that the control is in the differential mode Then press either the UP arrow key to increase or the DOWN arrow key to de crease the differential to the desired setting Step 7 Press the SET key again to access the stage 2 cooling or heat ing mode The LCD will display the current mode either C2 for cooling or H2 for heating Then press either the up or down key to toggle between the C2 and H2 des ignation Press the SET key once more and programming is com plete NOTE The ETC will automatically end program ming if no keys are depressed for a period of 30 seconds Any settings that have been input to the control will be accepted at that point All control settings are retained in non volatile memory if power to ETC 1s interrupted for any rea son Re programming is not necessary after power outages or disconnects unless different control set 21 17 Feb 00 Maritime Geothermal I td Ranco ETC PC Thermostats 8 ft extension cable Cover screws 4 Temperature sensor Circuit board Locking switch NOTE The temperature sensor can be extended up to 400 ft by cutting the sen sor extension cable a
38. rizontal fashion or with a Slight incline uphill will have better performance in the cooling mode due to considerations concerning the flow of liquid refrigerant back to the air handler when cooling Undisturbed Soil The 13 mm liquid lines must Floor Joist be reduced to 9 mm at the point of entry to the building N 7 where the vertical rise begins S Insulate all AA Inside lines Excavated Trench e V with armaflex 9 mm wall a Drill hole through wall approx 25 TN riran mm larger than pipe size Seal with foam or other watertight sealant Reduce the 13 mm liquid lines v suitable for max temp of 120 C to 9 mm here gt Insulate all lines within 3 m of Basement floor basement wall with 9 mm armaflex Page 10 Maritime Geothermal I td plished with a tracked excavator eguipped with a 1 to 1 3 m bucket If a wider bucket is available and you can afford the extra cost the trenches could be wider for improved perform ance The object of course is to allow the copper loops to contact earth which has not been influenced by the prox imity of another loop The trenches are dug from 1 5 to 2 m deep to a total length of 55 m Each of the EMDX loops is 107 m long and when laid in the form of a U down each side of the trench the turn at the end will occur at 54 m allowi
39. rmostat not calling for heat High or low pressure limit open Lock out relay energized Heat Cool units only control board shows hi or low pres per manent lock out Normal operation except too fre quent starting and stopping Refrigeration gauges show suction pressure dipping below 138 kPa Refrigerant pressure control should open on drop at approx 138 kPa Normal suction is 275 400 kPa Check individual suctions to verify that each TXV opening and closing cycle 1s approximately the same Check for refrigerant flow through TXV and filter Make sure tank 1s full of water and not above 50 C 122 F Page sien 22 Maritime Geothermal Ltd Locate open control and determine cause Replace faulty control if nec essary Heat Cool Units Only Microcontroller board shows RED high pres or GREEN low pres lockout flashing or glowing steadily Check differential in aquastat is set for at least 3 C Check refrigerant level Add refrig erant slowly Check for possible leaks Normal charge is 1 8 kg per ton Control should reset automatically Heat pump can then be restarted by resetting the lock out relay or ctrl board Turn power off then back on Replace faulty control if 1t will not reset Replace TX V s if not operating properly Replace filter or TX V if required Fill tank with water Maritime Geothermal I td 17 Feb 00 DOMESTIC HOT WATER Insufficient hot
40. ry little heat is absorbed from the ground near the basement wall thus avoiding possible frost damage to the structure 17 Feb 00 Maritime Geothermal Ltd Horizontal EMDX Loop Field Plan View lt A 4 ton system shown 1 3 lt Z K m Coiled copper tubing r ee U gt gt gt e Excavated trenches minimum 1 3 m wide x 1 8 m deep Note Trenches will be backfilled with material which will maximize the thermal conductivity of the adjacent earth e Each loop consists of 107 m of 13 mm OD type L copper tubing 53 m e Allow a minimum of 3 m between each trench and preferably 5 6 m if space is available IMPORTANT Install 13 mm plastic perforated soaker hose 6 to 1 3 m below grade A Manifolding done inside the building CA e Insulate all tubing within 3 m of the structure Example with 13 mm closed cell armaflex insulation Heat Pump Building is slab on grade construction with heat provided by e Piping that is laid in a header trench should M hot water pumped through tubing be insulated to a point where each loop Utility Room embedded in the slab branches to it s individual trench am e Loop 4 shown above could be left DX to W style heat pump uninsulated to pick up heat in the header trench as long as
41. s either ex tracted from during the heating mode or introduced to during the cooling mode of operation Energy Machine Overview As a result of direct urging from the engineering community Maritime Geothermal Ltd has developed a unique new heat pump solution specifically targeted at buildings which employ infloor heating as the primary energy distribution system in the building The need for an integrated package liquid to water or DX to water heat pump became apparent as mechanical engineers who were designing the buildings found that the complexity of setting up a mechanical room with suitable heat pumps circulator pumps storage tanks aquastats and other controls seemed to pose a confusing demand on the installation con tractors plumbers and electricians This complexity usually required repeated consultations on site with the designing engineer and various tradesmen in volved in carrying out the heat pump installation and with companies involved in integration of the building manage ment system To address this situation Maritime Geothermal Ltd Designed the Energy Machine with all mechanical components re quired to mate successfully with an infloor heating system built into the heat pump enclosure The plumber need only connect the supply and return to the floor header system and the electrician makes a single wiring connection to the unit for heat pump circulator pumps and back up electric heat An Energy Machine in
42. temperature rises above the electric back up setting S2 will disapear from the display and only the heat pump will be operating 5 If you wish to operate the unit without the electric back up coming on then switch the internal electric heat breaker off 6 At the electrical disconnect switch place the amprobe jaws around the supply wires and record the current in each conductor and record this current 7 When the tank comes up to temperature you can open any valves on the hot water supply lines and the unit is ready to operate General Maintenance As with any piece of equipment there will eventually be some maintenance to be done on the heat pump however a EMDX heat pump 1s relatively maintenance free and only one item will need attention as follows Check contactors for burned or pitted points Theory of Operation The EMDX heat pump utilizes a typical vapor compres sion refrigeration cycle similar to many other common appli ances The only difference between a Direct Expansion heat pump and a conventional geothermal unit 1s the fact that the DX unit has it s heat exchanger embedded in the ground The EM machine also incorporates the condenser coil directly in side the internal hot water buffer tank Due to some engineering obstacles involved with remote parallel evaporators some special equipment and techniques which are described below are required to allow such a sys tem to work effectively Some text below may a
43. the header trench is more than 3 m out from the building 12 m BUILDING Page 12 Maritime Geothermal I td Pressure testing linesets Using the 6 mm schrader valve supplied on each loop the installer can again check the pressure on each lineset with his refrigeration gauge set before releasing the pressure and cut ting the loop stubs coming into the basement to the proper lengths Interconnecting tubing Once the outside loops have been installed it is necessary to interconnect the gas and liquid lines of each loop coming into the building to its corresponding line on the heat pump Each set of two pipes is labeled on the EMDX heat pump as loop 1 liquid loop 1 vapor etc depending on the tonnage of the heat pump The larger of the two pipes is the gas line 13 mm OD while the smaller line is the liquid line 9 mm OD The dealer must install a 13 mm OD gas line from each of the gas lines on the heat pump to the corresponding gas lines of each groundloop Similarly a 9 mm OD liquid line must be run from each heat pump liquid line to the cor responding liquid line of each groundloop Note that there is a transition in size from 9 mm to 13 mm as the liquid line attaches to the groundloop stub coming into the basement A suitable reducing coupling can be purchased from any refrigeration wholesaler The tubing used for this procedure must be refrigeration tu
44. thermal Ltd Heating Mode Soil Btu s Comp Comp Blower Blower TOTAL Temp HAB EWT LWT Flow Out Amps Watts Amps Watts Watts COP 70 62860 100 114 1 10 84730 31 8 6551 4 2 414 6965 3 56 65 60207 100 113 7 10 82080 30 5 6299 4 3 420 6719 3 58 60 56347 100 112 8 10 76542 29 2 5990 4 3 415 6405 3 50 55 50459 111 8 10 70659 5721 4 2 413 6134 50 46511 100 111 2 67164 l 5428 4 1 414 5842 45 42117 100 110 4 62200 5173 l 415 5588 40 38521 100 109 7 58167 l 4904 l 410 5314 34 33010 100 109 53759 4611 l 412 5023 30341 100 108 3 49725 4491 l 4903 Water flow in IGPM Temperatures in F Btu Output Ground Temperature Deg F Page 26 Maritime Geothermal I td Ranco ETC Thermostat Controls 17 Feb 00 The Ranco ETC is a microproc essor based electronic temperature control designed to handle the OFF ON functions of the NOR DIC EMDX unit The ETC 1s equipped with an LCD display which provides a constant readout of the sensed temperature and a touch keypad that allows the user to easily and accurately select the setpoint temperatures and differen tials for the first and second stages of operation Programming Steps and Dis play Step 1 To start programming press the SET key once to access the Fahrenheit Celsius mode The display will show the current status either F for de grees Fahrenheit or C for degrees Celsius Then press either the UP arrow or DOWN arrow key to
45. tic casing is removed units so eguipped where a small portion of 1ts heat 1s re moved in the production of hot water The hot refrigerant then enters the air coil where the refrigerant vapor is condensed by the process of cool household air flowing across the air to refrigerant coil Further sub cooling of the refrigerant liquid takes place as the refrigerant reaches the bottom of the coil and begins another cycle 1 It allows the machine to switch from heating to cooling mode without shut off on it s low pressure control since refrigerant pressure is supplied to the intake of the com pressor by the idle loops while the refrigerant is being repositioned to operate in another loop or loops Once the refrigerant enters the groundloop s 1t condenses giving up its heat and returns to its liquid state Oil and liquid refrigerant are swept along the underground copper lines back to the liquid line header assembly where it flows through the cooling check valve s connected to the respective liquid lines and onward towards the cooling TX valve which meters re frigerant into the air coil as required Liquid cannot enter any of the other liquid lines because of the orientation of the cool ing check valves nor can it enter the heating section of the liquid line header by virtue of liquid line solenoid valve A being energized closed while in the cooling mode Maritime Geothermal I td 17 Feb 00 EMDX Left Expansion Tank
46. toggle between the F or C des ignation For closer regulation of your PC temperatures we recom mend you program in the Fahr enheit mode STAGE 1 Step 2 Press the SET key again to access the stagel setpoint The LCD will display the current setpoint and the 1 annunciator will be blinking on and off to in dicate that the control is in the setpoint mode Then press either the UP arrow key to increase or the DOWN arrow key to de crease the setpoint to the desired temperature Step 3 Press the SET key again to access the stagel differential The LCD will dis play the current differential and the Dif 1 annuncia tor will be blinking on and off to indicate that the control is in the differential mode Then press e1 ther the UP arrow key to increase or the DOWN arrow key to decrease the differential to the desired setting Step4 Press the SET key again to access the al feed b b ELELEE i M 1 Pace Electrical Box stagel cooling or heating mode The LCD will display the current mode either C1 for cooling or H1 for heating Then press the UP or DOWN key to toggle between the C1 or H1 designation NOTE For purposes both stages of both aquastat are set to the H1 or H2 designation STAGE 2 Step 5 Press the SET key again to access the stage 2 setpoint The LCD will display the current set point and the S2 annunciator will be blinking on and off to indicate the control is in the set
47. ves decide to close at the same time The TX valves control the flow of liquid refrigerant to it s loop by virtue of the sensing bulbs being attached to each respective return vapor line and all the equalizer lines con nected to the common suction inlet line The sensing bulb of each TX valve is located just below the connection to the 3 way valves on the gas line header assembly Excavate alongside each borehole so that the cop per tubing can lay over into the trench The liquid refrigerant coming in contact with the warm earth vaporizes to a gas and flows back to the heat pump via the 13 mm OD copper return vapor lines System oil 1s en trained 1n by the velocity of the return gas and is continuously swept back towards the compressor Refrigerant vapor nor mally picks up from 2 to 6 C superheat as it returns to the heat pump Refrigerant vapor enters the 3 way valve header assembly at ports F passes straight through the valve to ports G where it exits to the vapor line header From the vapor line header the refrigerant gas enters the reversing valve at point H and exits to the common suction line T where it travels to the accumulator and onward to the compressor Hot high pressure refrigerant gas enters the desuperheater coil on Page Maritime Geothermal Ltd Vertical DX Borehole With Cop per U Tube Enoush extra tubing has been supplied to reach into the building when temporary plas
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