Installation Manual
Contents
1. 24v Low Voltage Wiring Field Thermostat Aquastat connections T stat SR C Common 24Vac Wiring Y O R Hot supply 24Vac O cO O O Reversing Valve Cooling Q O oO Oo Y Compressor 2 amp time HEATING MODE delay fuse 24Vac Connect R amp Y for to start CESA compressor heating mode COOLING MODE a 1 Connect R O to activate Sal reversing valve lt 6 2 Connect R Y to start I compressor in cooling mode Y Hot Water Circulator Pump Lock out Special Instructions Relay Note If heat pump is to be b operated without the hot water A circulator connected to the water 4 tank and flooded with water 0 _ El i oe remove the wire marked with A H E RED tape located here 2 R This pump is water lubricated 380 24v transformer g Circulator and must not be run dry e kaza o NOTE EEE The domestic hot water Field circulator pump voltage is Wiring Aux Circulator relay 220v 1 50 N tf YD L3 Te L 380v 3Ph 50hz Connections TS L1 Compressor relay TS Connect N to Neutral Gnd Connect L3 to Phase 3 Compressor relay Connect L2 to Phase 2 2 Connect L1 to Phase 1 Gnd lug Connect Gnd to gnd lug IMPORTANT NOTE FOR 3 PHASE SCROLL COMPRESSORS This uni2. r zg naM ps romii 80y Ad f s nid l d pI KON doo7 J i 1 L pls nO aa x OL S el HEM u jusweseg End L Je9H 4 h Ss ae J AA a oral Li 9L aime cones o 2 JBJE M gt yup yes ysn DIGUYON z uolsuedxg WOJ Soul WW Z sJ9y SPEW 3d BOVE 0 p ziueajeg LO UOHISUBA SBUBNH DAd 40 p zlueA eS doo punols o dung 3e9y Buiquinjd p suj 2BNFIOOD HIGAO OMLVIH 16 Page Maritime Geothermal Ltd constant for 1 hour NOTE If you use pressure gauges permanently installed on the system as in the case of a demonstration situation etc be careful not to exceed the maximum pressure rating of the gauges to avoid damage to their mechanism When satisfied all connections are leak free release the air pressure and connect a flush cart see diagram to the flushing access ports at the pump station A temporary flush ing system can alternately be constructed using a 170 litre barrel and a pump with Typical sufficient volume and head capability to Flush circulate fluid at a velocity of at least 1 Cart cm sec through all parts of the loop Be gin pumping water through the earthloop making sure that the intake of the pump stays submerged at all times by continu ously adding water from a hose etc Water flowing back
3. 32 mm PE 3408 Flexible Rubber Hoses x oA or other suitable Taco 011 ka j a 7 3 way 1 1 2 PVC Pool piping Backflush Valves 100 psig min Circulators Pump amp Purge Center ls coop 1 Valve in Loop fill purge position ml 2 Valve in HP fill purge position 3 Valve in normal running position Maritime Geothermal Ltd Page 19 Feb 00 Maritime Geothermal Ltd Typical 3 4 and 5 Loop Parallel Header Design oe be A HI 4 loop 4 ton system E Le LAD 160 m loops 1 2 3 4 5 5 loop 5 ton system 32 x 19 x 19 mm tee Ge 32 x 32 x 19 mm tee A kiwa a Y Y Y mi 32 mm 90 a Ly 19 mm 90 A OJ pa 19 mm tees 1m 32 mm SDR 11 Type 3408 PE pipe LO Page 20 Maritime Geothermal Ltd Feb 00 NORDIC Series Wec 45 55 65 80 175 o A A June 1998 Page 21 Feb 00 Maritime Geothermal Ltd Maritime
4. Supply Well Pressure Tank IS Nordic Heat Pump a 2 usss a Pitless l Adaptor Water Table i Tile Field 25 to 30 m 4 A U 92 M Submersible Pump C Tile Bed or Leaching Field Page 4 Maritime Geothermal Ltd 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 In to Heat Pump The heat pump is well con structed and every effort has been made to insure that it will arrive intact how ever it is in the customer s best interest to examine the unit thoroughly when it arrives 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 in floor 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 6m so that servicing and general maintenance can be carried out with a minimum
5. Installation WManual NORDICO models Wec 45 55 65 80 175 Liquid to Water Geothermal Heat Pumps Table of Contents METRIC VERSION CEE s c Water Well or Groundloop Operation Maritime Geothermal Ltd P O Box 413 Email nordic auracom com Petitcodiac N B E0A 2H0 www discribe ca nordic Feb 00 Maritime Geothermal Ltd A NORDIC Groundwater Heat Pump System Energy Input Solar Geothermal Water Pump System NORDIC Groundwater Heat Pump Fan Coils Infloor Heat Heat Distribution Disposal of thermally altered water Page 2 Maritime Geothermal Ltd Feb 00 NORDIC Liquid to Water System Prerequisites There are five specific parts or sub systems to a groundwater heat pump installation Returning the exhaust water to the earth for reheating Water Well Requirements The Heat Pump A heat pump with Btu output capable of heating the l A DRILLED well of 127 mm diameter oF larger home in all winter weather conditions should be selected us 2 Well casing properly sealed or grouted into rock ing a rule of thumb as follows 3 Water flow preferably entering well at a depth of 25m or morg Model Sq M of Home 4 Temperature of well at least 4 4 C Normally 7 C 5 Well must be able to supply requirements of BOTH heat Nordic Wec 45 160 pump and residence usage at the same time with maxi mum drawdown from static level of 9 m
6. amp Domestic Hot Water HOT Water OUT Cool Water 1 Es Compressor Accumulator V Connect to common A gt suction line II ll gt Bulb al A Bulb gt 1 Plate Desuperheater nev Valve a Eaporator i De energized A Heating Mode Plate W y CK Valve V Filter y A En Receiver E TXV Equalizer Tube Cold Water OUT Warm Water IN Maritime Geothermal Ltd Maritime Geothermal Ltd Feb 00 Water Flow Requirements in Litres min Condenser HOT Side We 65 60 000 Bas 182 nin J NOTE When selecting circulator pump sizes for the condenser side of a heat pump for infloor heat use it is normal practice to limit the temperature rise to 5 6 C or less for the highest output temperature vs refrig erant discharge pressure Equation Btu Output Btu s hr L min x 2 2 lbs litre x 60 min hr x temp diff C x 1 8 Therefore for a W 45 the temp rise across the heat exchanger would be Igpm Btu hr Output 35 000 26 51 L min C temp diff x 1 8 x 2 2 Ibs gal x 60 min hr 10 x 2 2 x 60 Divide the BTU output of any water heat pump by 1320 yields the flow required at a temperature rise of 5 55 C f
7. of difficulty Raising the heat pump off the floor a few inches is generally a good practice since this will prevent unneces sary corrosion of the bottom panel of the unit mometer We recommend that the heat pump be placed on a piece of 50 mm Styrofoam covered with 6 5 mm plywood The Styrofoam will smooth out any irregularities in the ce ment floor while the plywood will distribute the weight of the NORDIC 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 x 100 mm lumber can be placed under the unit running from the electri cal connection side to the opposite side of the heat pump Laying the 50 mm x 100 mm lumber in this manner will give the best support since they will be at right angles with the in ternal steel compressor and heat exchanger support Plumbing the Heat Pump water well application When installed on a water well the NORDIC heat pump must be supplied with an adequate water supply since In essence water is the fuel for the unit It is imperative that the flow requirements listed in the engineering section be closely adhered to When setting up the unit Maritime Geothermal Ltd Page lt Water IN 3 2 mm D stem Ther gauges attached through P T port Feb 00 recommends the installation of a water flow meter on the dis charge line so that the exact amount of water flowing c
8. E BO a ed O a else s O O O A E IA ZR16M3 TWD 3phase W 1 oo AC Nominal 12 ton Cooling EA il a kaiq u s A EF ERKA GAN Md A Kid A El A El A El O EC ms sz E A SS EC IS A E A KEEA ENCA E E E A MA EL R i i PE IO E E E ms EIC E MEGA Rm EAS E mus usa a IE IE EMI A A E A A A A EII E Km CD un mu E E AA us EA A A E E EA AE A A AA IA A A E EG cl A O UG O RO O A O SO A A E IG AAA AL PARA BE CA mm E BC um RA aa m A A CF ZR16M3 TWD 3phase Page 30 Maritime Geothermal Ltd Feb 00 NORDIC W Series Trouble Shooting Guide COMPRESSOR Compressor not op erating Possible Cause Power Failure Disconnect switch open Fuse blown Low voltage Burned out motor Thermal overload on com pressor tripped Faulty compressor contac tor Seized compressor due to locked or damaged mecha nism Verification Electric circuit test shows no volt age on the line side of compressor contactor Voltmeter shows no voltage on the line side of the compressor contac tor 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 ter minals Note Be sure compressor overload has had a chance to reset If comp is hot this may take sev eral hours Ohmmeter shows
9. Water e Double wall potable IN Sa _ water desuperheater e Domestic Hot Water eee Horae aicun e High Efficiency brazed ATT plate heat exchangers Galvanized metal with baked enamel or epoxy based fin ish Supply water IN _ x e Thermostatic ex pansion valves x e Reversing Valve e Liquid line filter drier e HOT water OUT e Sight glass e Liquid receiver e HOT water IN e Insulated water coils e High efficiency scroll compressors et e Supply water OUT e Suction accumula Front Plumbing side tor e Baked enamel cabi ir O O e High 8 Low access net with satin galva se Y h ports nized condensate n e Remote reset lock tray and floor out relay system pO aa El e Acoustically insulated sible from all four ail apiri y sides E e Heavy duty electrical eS e Cabinet spot welded components E together for superior e Hard start kit on all strength models single phase e High efficiency scroll models g compressor e Back Electrical Box Side Page a 23 W HACW Series Refrigeration Circuit Heating Mode Functions Heating Cooling
10. ground moisture content and configuration of loops desired It is often possible to shorten loop lengths and resulting costs when using some of the newer Slinky designs of earth loops A comprehensive manual dedicated entirely to the in stallation of groundloops is available from Maritime Geother mal Ltd which describes in detail the techniques involved in installing a closed loop system Vertical Groundloops Vertical groundloop systems are generally the system of choice for commercial and institutional buildings since the land area available 1s often limited to parking lots with some adjacent landscaped areas Boreholes of 100 to 152 mm diameter are drilled with conventional drilling equipment usually to a depth of less than 90m Each ton of heat pump installed requires approxi mately 46m of borehole The 19 to 25 mm plastic pipe U tubes are fused together using socket fusion techniques and Horizontal Groundloop WEY System 218 Vertical Boreholes 13 Feb 00 trench length y O 3 18 m Maritime Geothermal Ltd One Example of Piping Layout for Horizontal Closed Loop Heat Pump System ton system shown 18 2 m KE K 1 3 gt K 3 gt INFLOOR TUBING 12m BUILDING Page 14 Type 3408 PE tubing Excavated trenches minimum 1 3 m wide x 1 8 m deep NOTE Trenches will be back filled with m
11. land is available 8m spacing will produce better results Boreholes should be tremie grouted from bottom to top with bentonite or a mixture of bentonite and neat cement for proper con duction with the earth Design 4 Shown here is a typical series loop design using 32 to 38 mm pipe for the loops Some designs incorporate a double U tube as sembly down the well which allows for better heat transfer between the earth and the loop NOTE Many other loop designs are in common use throughout North America For a more comprehensive manual on earthloop design refer to our Earthloop Design Manual or contact IGSHPA International Ground Source Heat Pump Association and request their earth systems dealer training manual Page 12 Maritime Geothermal Ltd Feb 00 W Series Closed Loop Installation Information Introduction Many commercial buildings select a vertical or horizon tal closed loop as the earth heat exchanger either because of a lack of available groundwater or for the reduced maintenance costs which can be obtained when compared to open loop sys tems Often the problems which occur in a geothermal sys tem are associated with the wells pumps or the direct result of utilizing poor quality water or water which is contaminated with sand or other foreign materials Such contamination can cause premature failure with pumps water valves heat ex changers and return wells To reduce these problems to a mi
12. on the return line should be directed below the water level in the barrel or flush tank to prevent air being mixed with the outgoing water Once the lines have been filled and no more air bubbles are appearing in the line adjust the flow valves to circulate water through the heat pump using the same technique as de scribed above When all air is removed reverse the flow of water through the lines by interchanging the flush cart lines and purge again You will be able to visibly tell when all air is removed Installing Antifreeze In most mid and northern areas of the US and in all of Canada it is necessary to condition the loop fluid by the addi tion of some type of antifreeze solution so that it will not freeze during operation in the winter months This antifreeze Is required because the loop fluid will normally reach a low entering temperature of 2 2 C to 0 C and refrigerant tem peratures inside the heat pump s heat exchanger may be as low as 11 C cooler See the antifreeze concentration chart at left for details of freeze protection afforded under different concentrations NOTE Add enough antifreeze to allow for a tem perature 11 C lower than the expected lowest loop fluid temperature entering the heat pump NOTE Although many different antifreeze solutions have been employed in geothermal systems the alcohols such as methanol or ethanol have the most desirable characteristics for earthloop application The overall
13. pump is started A combination of low condenser temperature water and 7 C water in the hot water tank may cause the unit to shut down on it s low pressure con trol If this happens close ONE valve in the hot water circuit to temporarily shut off the flow to the domestic hot water gen erator Do not shut off both valves since water expanding in the hot water generator loop may cause damage to the circula tor pump housing When the hot buffer tank has come up to temperature open the valve for normal hot water operation Slightly open the union on the hot water discharge pipes to make sure that all air is out of the system and the cir culator pump is flooded with water 6 Make sure all pumps are wired purged of air and ready to pump water 7 Vacuum out any dust and debris that may have collected in the unit during installation 8 Make sure the unit is sitting level 9 Make sure the proper time delay fuse has been installed in the fuse box 10 Have the following tools on hand and know how to use them In line Flowmeter Page Maritime Geothermal Ltd A refrigeration gauge set An electronic or other accurate thermometer An amprobe e A water flow meter 11 Connect your refrigeration gauge set 12 After the 4 hour warm up period place the thermostat function switch in the HEAT position turn up the thermostat The compressor main heat exchanger circulators and domes tic hot water circulator will start NO
14. reading when Recommended Action 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 placed across R and S terminals and faulty replace compressor infinity between C amp or C 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 pttted or burned Compressor attempts to start but trips it s internal overload after a few seconds Faulty run capacitor Check with ohmmeter for shorts Replace if faulty open etc Page 31 Replace contactor Attempt to rock compressor free If normal operation cannot be es tablished replace compressor Feb 00 cont Compressor not operating Compressor short cycles Unit trips off on LOW suction pres sure control Unit trips off on HIGH pres control Possible Cause Open control circuit Intermittent contact in electrical control circuit Compressor over loaded Low or no evaporator water flow Evaporator water supply too cold Faulty low pressure ctrl Low refrigerant charge Low or no conden
15. the system before the unit is started This step will make certain that the water circulator is flooded with water 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 obtained A hand placed several feet down the line will sense when the water 1s flowing The thermostats on the hot water tank should be set to 49 C since the heat pump has an internal thermostat set at a low of 52 C By setting the tank thermostats as described 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 summer or periods of high de mand the electric elements will energize to help make hot water NOTE If 2 shut off valves are located on the hot water lines as shown in the diagram on page 11 be sure that the valves are open when the heat pump is operating If both valves are closed when the heat pump is operating water will expand in the hot water heat exchanger and could cause damage to the hot water circulator pump Water Disposal Methods Page Feb 00 Water disposal methods vary from area to area how ever some consideration should be made to prevent the cooled discharge water from immediately coming in contact with the supply source Generally speaking returni
16. with tape to add weight Table 1 Antifreeze Percentages by Volume Protection down to 10 to the assembly and also prevent it from curling up and goug ing into the side of the borehole during insertion The entire length of the assembly should be taped every 3 m to create greater rigidity in the U tube assembly as 1t 1s installed in the borehole The U tube is inserted into the borehole along with the tremie pipe and the borehole is tremie grouted from bottom to within 3 m of the top with a mixture of neat cement and bentonite or 100 bentonite When using bentonite refer to the manufacturers instructions for mixing and select a prod uct that provides a total solids content of from 25 to 30 when mixed Horizontal trenches from 1 3 to 1 8m deep are dug alongside the boreholes to the building so that a reverse return first pipe out on the supply line is the last pipe back on the return line header pipe arrangement can be constructed to tie all the loops together Lay out the header system so that air cannot be easily trapped in the header using a technique ap proved by IGSPHA or the local governing authority Use a shovel to break away any ground between the trench and the boreholes and dig a relief no less than 30 times the diameter of the pipe to allow the pipe to bend to the header pipe with out kinking Be very careful not to disturb the original ground under the relief so that you do not have to worry about the pipe b
17. A Soma anu wasa EA A EAN AAA AAA AAA EC O O as A A EA AAA AAA AAA A GO UG O GO O O O O A E NG sa 9 pe 1 pjs SAP AO OPA ZR68KC TFD 3phase Model Page 28 Maritime Geothermal Ltd Feb 00 W 80ec HAC Nominal 8 ton Heating Source Data Power Consumption Sink Data Ee EAT A A AAA u s MG O II O O CG A O GA A E IU e A E A eza E IS U ST IC IS J IS Is s s kasa mm Kum mun mmm Al Bk mm Rz ma AA MEG IEA m uN Kz ua m un um mm uw O A A mann kaa was WW AR Wc Wa A A A E kuska munku mm sn u O mm EA DA K N e l l T aie ee IC E DO O 0 ee AAA fete te area ZR11M3 TWD 3phase W 80ec HAC Nominal 8 ton Cooling ETA a a A u s E a aruna A A NE ME O A FEE A E A A i GO i GC OC IC E a E ms EIA IAE EEG mm IE RIC mun uma man LA aan mai A E mmn wimani Re al dM RA Bi IO A A mua nmmn ima mos utu wam ta ua toa a anun EA A E A E E E EA E E EE EC A E AC E IA RS EAN A O AECA EC EN IA A E A AAA EII IE E E EG E A mm AAA AO OPA ZR11M3 TWD 3phase Page 29 Feb 00 Maritime Geothermal Ltd W 175ec HAC Nominal 12 ton Heating Source Data Power Consumption Sink Data IED IIA EAT L il E A ll A u s AAA AAA AA A e E E a eras o BA Rm KZ ms EC ms mk um am ma A ka mm m kasa K us KZ mmmn ms m 2 IN maka kuka A Bk DS SB I A E E E aca A EIN A AA A PAPA II A O A SI BW SR A E A ll A E OS O EC E dO A j o L n a T IN T WDS O O IR a
18. Geothermal Ltd Color Caissie Grey Liquid to Water Heat Pumps Models W 45 55 65 Style Vertical Date June 1998 Drawn By G Kaye Title Cabinet Layout x AN High Pres 0 x o o Low Pres YV Electrical 710mm Box E E Ww a Back View pr 76 mm le e Domestic Hot IN 76mm 0 Domestic Hot OUT 100 mm an Thermostat wt e 8 Cold Supply IN Hot OUT 280 mm x 660 mm Aux Konocout V H 100 mm T e Electrical Supply AN O al e Cold Supply OUT Hot IN e 76 mm 64 mm gt A J Y V Right Side View Front View ToS s s General Specifications Case constructed of satin galvanized materials with epoxy latex enamel finish Type 316 copper brazed plate heat exchangers on both source and sink sides High Efficiency scroll or reciprocating heat pump compressor Liquid receiver and suction line accumulator Four removable doors and a removable top for easy access from any side Acoustically insulated cabinet Optional domestic hot water heat exchanger All Copper piping throughout the heat pump Pace mis 22 76mm 76mm Maritime Geothermal Ltd Feb 00 Maritime Geothermal Ltd Color Caissie Grey Liquid to Water Heat Pumps Models W 45 55 65 Style Horizontal Date June 1998 Drawn By G Kaye Title Component amp Piping Layout e Domestic Hot
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20. S A EIA IE OB ICA ICO II O A A AE A A E EA E Km E DO mms mmn ma ms Ga ma ka A Km A BO ananman ks Es SN DE Km mun mn ma Bl Km um NE ESA EA A A E A a E E L21828 DG E O E O FR O AA WN AR A A A A A A E OO e _ abe A Guss _ I O ee IO E L a l l eles n el LIST Ppp ZR57K3 TFD 3phase Model W 55ec HAC Nominal 4 ton Cooling ETA e el ie a A u s e e e OW A DEA ED O EC KN E EI EC m mm am E AE KEEA ENEA A A i O E SC CS am mm E Gal EA zs ENLACE A AAA EMI EIA E E EIA OIE Kx Sum m um ua wam A AA gus AAA Ee BA E Su AL um O SEA EE asum IA A A E E EA A A EA A GA UG O O O GA E O A EG Ape ss 19 10 pe pjs gt PPP ACP ZR57K3 TFD 3phase Model Page 27 Feb 00 Maritime Geothermal Ltd W 65ec HAC Nominal 5 ton Heating Source Data Power Consumption Sink Data mmmn EAT a E a il ES A ll A u s T lt L O O a A A IE II A A A A c ESA E E EA Km I Oa mus Kol mm CO A ma koa taka A Km Bk mam sn ms mm um mn mmmn maka sus mm MEG EA Kum Kz Kms mm mn un ll MW WE A MSW AAA AAA si EA Tas E AC OS Kun FI AA um AR A A A E E E O s CS O s A EA EA A A e _ A II i HES O a IO IO l a eet O GO O O A E E E ZR68KC TFD 3phase Model W 65ec HAC Nominal 5 ton Cooling ESE MENE ll a ni Ml de ea el sasa u s OW cA AA A Nal A A EC US A EEE AAA AAA i EGO DIC CE CS A IL O i A E EIA AA AE E REG mun CS IA CO ma O ms wan mai EA A A A A AAA AAA BI A A oan mw wn
21. TE If the unit is equipped with an electric TACO water valve the valve will open in 30 to 60 seconds followed by the compressor When the TACO water valve is fully open an internal switch activates the compressor circuit 13 Observe the readings on the high and low pressure gauge set With entering water temperature of 7 to 10 C the suc tion pressure blue gauge should be approximately 365 to 400 kPa while the head or discharge pressure red gauge should be in the area of 1550 to 1900 kPa Depending on the condenser side water flow and temperature Record this in formation on the warranty test card 14 Using an electronic thermometer or other accurate ther mometer record the supply water temp IN and the water temperature OUT The outlet water temperature should be from 2 2 to 4 C cooler than the inlet water temperature 15 Record the supply water flow in gpm 16 Record the condenser HOT water flow through the ma chine At 45 Lpm You will see a 4 C to 5 5 C rise through the heat exchanger 17 Record the voltage at the terminal blocks with a digital voltmeter 18 At the electrical disconnect switch place the amprobe jaws around the supply wires and record the current in each 19 Place the thermostat function selector in the COOL posi tion and turn down the stat to a temperature that will cause water chilling to begin When the aquastat selector switch 1s set in the COOL mode the reversing valv
22. Water Requirements For Nordic Heat Pumps Model Wec 45 Heat Pump Home Total 32 L min 46 Wec 65 55 Limin 14 69 90 L min Wec 175 113 L min Note These are minimum water requirements based on an entering water temperature of 7 C 104 127 Water Pump System Nordic Wec 55 Nordic Wec 65 325 Nordic Wec 80 Nordic Wec 175 NOTE Rule of thumb use proper heat load software to Maritime Geothermal Ltd recommends that anyone consider ing the installation of a heat pump in their home or office have a professional heat loss load calculation prepared on the building to determine the heating and cooling require ments The correct sizing of the heat pump to the home can only be properly accomplished with the use of specialized software programs designed for this job Discharge Water Methods 1 Although we highly recommend it you do NOT neces sarily have to have a return well 2 Some of our customers do one of the following with their return or waste water A Run it into a drain or ditch 1 A submersible pump is generally required Must be able B Pond river or stream to pump the required water flow listed above at a mini C Leaching field mum of 210 kPa at the dynamic pumping depth of your In most instances if you run the water right out on well f top of the ground it will soak back into the ground in less than 2 Make sure you select the pump using the pump manufac 15m of travel If suitable car
23. a properly qualified electrician be retained to make the connec tions and wire the thermostat The NORDIC unit may be supplied with a thermostat and connections are clearly marked on the control box Using a 3 conductor 18 gauge wire suitable for the job connect the terminals in the heat pump electrical box to the corresponding terminals on the thermostat Feb 00 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 Check all low voltage thermostat to make sure they are connected properly Place thermostat HEAT OFF COOL switch in the OFF position 3 Turn on the main power switch Allow the power to remain ON without starting the unit for a period of 4 hours Refriger ant migrates to the compressor oil when the compressor is unheated On most units a crankcase heater is standard equip ment on your heat pump and it will warm the compressor dispelling the liquid refrigerant Compressor damage can oc cur if the heat pump has been brought in from a cold location and immediately started up 4 Turn on the water supply and check all plumbing for leaks 5 Check all buffer tanks and the domestic hot water tank to be sure it is filled with water before energizing the circuit NOTE The hot water tank should be energized for at least 4 hours before the heat
24. an be determined at a glance Once the correct flow of water has been established and determined to be consistent the water flow meter could be removed from the line NOTE Installing unions at each end of the meter and similar unions on a piece of pipe of the same length allows the user to insert the meter in the line whenever the flow of water is to be checked and then remove the meter so that 1t does not deteriorate from day to day usage Plumbing lines both supply and dis charge must be of adequate size to handle the water flow necessary for the heat pump For distances less than 12 m from the pres sure tank 19 mm copper or plastic lines should be run while for longer distances we recommend that 25 mm plastic or copper lines should be run to the heat exchanger Similarly a 25 mm line should be run from the discharge pipe to the method 1f disposal Install a P T Pete s Plug plug on the Wa ter IN and Water OUT lines just outside the heat pump so that it is easy to record the water in and out tempera tures and pressures accurately Ideally there will be water flow available in excess of the requirement of the heat pump In such a situation the proper pump can be selected to maintain a pressure of 200 to 275 kPa on the lines when the heat pump is operating However in some cases a well can supply a heat pump only if the minimum requirement for water is used Brass fitting on water lines to heat Pump and OUT line
25. aterial which will maximize the thermal conduc tivity of the adjacent earth Each loop consists of 150 m of 19 mm type 3408 PE 1100 kPa SDR 11 geothermal e heat pump polyethylene tub ing Allow a minimum of 3 m be tween each trench and pref erably 5 to 6 meters if space is available az E s H 19 mm T s j Tum us Header ae Detail 32 mm header pipe VO A Insulate all tubing within 3 m of the structure with 13 mm closed cell insulation Piping that is laid in a header trench should be insulated to a point where each loop branches to it s individual trench Loop 4 shown above could be left uninsu lated to pick up heat in the header trench as long as the header trench is more than 3 m out from the building Manifolding is normally done outside the building using suitable fusion tools Maritime Geothermal Ltd then pressure tested for leaks at 690 kPa using either water or air Provision should be made to allow enough extra pipe to extend from the boreholes to the proposed location of the header system Prior to inserting down the hole the assembly must be filled with water so that buoyancy will be at a mini mum when inserting the U tube Cap the ends so that mud and debris cannot enter the loops during insertion and grout ing A piece of heavy rebar or galvanized pipe is attached to the bottom 3 to 5 m of the U tube
26. e is taken to insure that the drain turers pump chart f f pipe runs downhill and the end of the pipe is protected by a 3 Use a minimum of 135 litre equivalent air bladder tank bale of hay or spruce bows etc the end of the pipe will not 4 Make sure the pump will be able to pump the required flow for the heat pump while maintaining 275 kPa on the water lines for usage in the rest of the home Page freeze When snow comes it will usually cover the entire process much like a small spring The above information is intended to give the prospective user purchaser some insight as to the general requirements for a successful application of the NORDICO heat pump Feb 00 Maritime Geothermal Ltd NORDIC W Series Open Loop Disposal Methods A i Supply Well Pressure Tank Nordic 6 Heat Pump aA gt Pitless gt Adaptor Water Table j TEEN A Single Well Pump amp Dump B S Supply Well Da onte ank Nordic Return Well Heat Pump al AAN C s 1 Pitless Adaptor Water Table I 25 to 30 m ee S gt Submersible Pump B Two Well System q HH
27. e will be energized The Dole flow control is a simple self cleaning device designed to deliver a con stant volume of water from any outlet whether the pressure is 100 kPa or as high as 860 kPa The controlling mechanism con sists of a flexible orifice that varies it s area inversely with pressure so that a constant flow is maintained 10 Maritime Geothermal Ltd Feb 00 Maritime Geothermal recommends that a qualified service General Maintenance man be retained to carry out this procedure since the solution As with any piece of equipment there will eventually be some involved is highly corrosive maintenance to be done on the heat pump Reversible NORDIC heat pumps are equipped with coaxial type heat exchangers These heat exchangers are not manually cleanable however they can be cleaned with a sulfamic acid solution commonly marketed under the trade name Iron Out If you suspect that the water being pumped through the unit is of a poor quality or you notice a decrease in per formance after several years of use it may be necessary to have the liquid heat exchanger cleaned Open Well amp Hot Water Tank Plumbing Diagram W Series Liquid to Water Heat Pumps Cold Supply IN Hot Water out NOTE Check IN and OUT Labels on your heat pump Remove drain in tank and Design changes can cause in
28. eat pump can then be restarted by resetting the lock out relay Turn power off then back on Replace faulty control if it will not reset Add refrigerant slowly until sight glass clears Install fluorescent dye and check for possible leaks with ultra violet light halide leak detector etc Check circulator pump operation Check operation of condenser refrigerant water flow valve Replace filter or TX V if required Maritime Geothermal Ltd Feb 00 Low temperature sensor opens High Pressure limit opens DOMESTIC HOT WATER Insufficient hot water Domestic Hot Water Storage Tank not maintaining at least 49 C Possible Cause Verification Recommended Action Low or no water flow on Check fluid flow strainers pumps Restore proper flow and tempera evaporator side and valves in the system Temp ctrl ture Reset lock out relay Re Note The function of the two will open in about 1 minute if water place low suction temp thermo heat exchangers are reversed _ flow is interrupted or if unit is run stat when in cooling mode Evap with suction pressure below 345 kPa Becomes cond cond Be comes evaporator Aquastat on cold buffer tank Verify accuracy of aquastat with reli Replace or readjust aquastat for set too low Should be 6 1 able hand held thermometer proper operation T2 C Low water flow on condenser Check flow of well water or loop wa Restore flow and reset lock out side te
29. eing kinked through compaction of the earth under the pipe after the trench is backfilled Fuse the individual smaller loops to the main header loops and extend these into the home by drilling through the concrete wall or by rising up the out side of the basement wall or slab and entering the structural part of the home or building above grade Any piping that comes within 3 m of the structure should be insulated with 10 to 13 mm closed cell armaflex insulation to prevent freezing from occurring near any structural part of the building Like wise all piping inside the building must be insulated to pre vent condensation and subsequent dripping onto floors or walls Circulator Pump Module When the groundloop has been brought inside the home or building to the location of the heat pump it must be con nected to the pump module which generally consists of 1 Grundfoss Model UPS 26 99 or Taco Model 0011 pump for systems up to 3 ton and 2 pumps for systems up to 5 ton Page Feb 00 These units must be able to pump at least 9 5 to 12 l min per ton of heat pump for proper operation of the system To cal culate the size of pumps required use the pressure drop tables for the diameter and type of tubing used along with all el bows T s etc and the pressure drop through the unit s heat exchanger to arrive at total ft of head x 12 l min ton x No of tons Heat Pump to Circulator Piping The heat pump must be connec
30. flow regulating valve 35 to 55 L min mi A 10 mm Copper or Plastic lines Air Bladder tank Return Well Dl Pressure Pressure s e Gauge Switch 50 Micron Strainer Supply Well c w Submersible Pump System Page 8 Maritime Geothermal Ltd Feb 00 NORDIC W Series 2 fitting Buffer Tank Piping Lines C and D can be run to any device that requires hot water such as infloor heating car wash laundry or commercial kitchen See other diagrams in this section for further details on typical plumbing schemetics ie gt C Y Check Valve Min 25 mm lines Wec 45 65 Min 32 mm lines Wec 80 Min 38 mm lines Wec 175 4 C to 70 C Thermometer Pressure Relief Valve PRV Taco Model 0011 Aquastat High Velocity Pump Insulated Tank IMPORTANT INSTRUCTIONS 1 Diagram above shows the proper manner for plumbing a tank that has only 2 ports 2 The tank must have at least 38 mm fittings at A to accommodate the flow from the heat pump and the floor circulator pump when both are in operation 3 The water line between A on the tank and the Tee at B should be at least 38 mm 4 Install a check valve at C and D to prevent back flow through the floor system or the heat pump when only one of the two pumps is running 5 The ta
31. h are designed to protect the unit from situations which could damage it A LOW REFRIGERANT PRESSURE heating mode The low refrigerant pressure control is designed to shut the unit down if the refrigerant evaporating pressure be comes too low thus risking the danger of freezing conditions in the evaporator There are only 4 reasons why this control would activate and they are 1 Low water flow See requirements for each model 2 Low water temperature Below 4 5 C 3 Dirty or fouled heat exchanger 4 Low refrigerant charge B 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 there is an interruption in water flow Such a situation could occur if the hot buffer tank circulator pump failed or if the heat pump had an extremely dirty air filter C LOW SUCTION TEMPERATURE CONTROL cooling mode Feb 00 Maritime Geothermal Ltd NORDIC W Series Hot Water Production Domestic Hot Water Out check valve thermometer O N Aquastat set at 49 C max l Regular 3 Hot Water sl VOS Tank J gt A i Taco Model W 0011 DF or High DC Velocity Circulator u _A Use FULL port ball valves to minimize pressure drop in all systems Dole
32. heat transfer character istics of these fluids remain high although care must be taken when handling pure alcohols since they are extremely flam mable Once mixed in a typical 25 by volume ratio with wa ter the solution is not flammable In situations where alcohols are not allowed as a loop fluid due to local regulations then propylene glycol is a non toxic alternative which can be sub stituted Propylene glycol should only be used in cases where Page Feb 00 alcohols are not permitted since the heat transfer characteris tics are less desirable and 1t becomes more viscous at low temperatures which increases pumping watts The volume of fluid that your loop system holds can be closely estimated by totaling the number of ft of each size pipe in the system and referencing Table 2 the for approximate volume per 30 me ters When the volume of the loop has been calculated and the appropriate amount of antifreeze 1s ready for addition by referencing Table 1 drain the equivalent amount of water from the flush cart or mixing barrel and replace it with the antifreeze When using alcohols be sure to inject it below the wa ter line to reduce initial volatility of the pure antifreeze If the loop is large and the tank is small it may be necessary to refill the tank with antifreeze several times to get all the antifreeze into the loop Pump the loop for 5 to 10 minutes longer to insure the remaining fluid has been well mixed I
33. ly 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 Geothermal Ltd within 21 days after the in stallation of the unit 3 It is the responsibility of the building or general contractor to supply temporary heat to the structure prior to occupancy These heat pumps are designed to provide 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 4 It is the customer s responsibility to supply the proper quantity and quality of wa ter If the heat pump manufactured by MARITIME GEOTHERMAL LTD fails to con form to this warranty MARITIME GEOTHERMAL LTD s sole and exclusive li ability shall be at it s option to repair or replace any part or component which is re turned 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 comp
34. ng cooling unit then a dual high pres sure low pressure valve or a pair of valves must be installed Another method of regulating the flow is by the use of a DOLE valve This valve will automatically control the amount of water flowing through it by varying the diameter of a flexible rubber orifice through which the water passes If either of such valves is needed they can be supplied and in stalled by your dealer All water line valves on both the supply and dis charge lines should be either BALL or GATE valves since a GLOBE valve will create too much restriction across the line possibly causing the heat pump to trip out on it s low pressure safety cutout control as a result of insufficient water flow Exposed water lines will have a tendency to sweat when the heat pump is in operation therefore it 1s recom mended that both the water supply and discharge lines be in sulated with suitable insulation 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 litre minimum A typical piping diagram is shown on page 11 in this manual Be sure to note the position of the check valve and the direc tion of water flow One should be sure the tank is filled with water and is under pressure before activating the heat pump Slightly loosen the copper union on the hot water discharge pipe to allow air to escape from
35. ng water to a second well pond lake or stream is acceptable while re turning water to the same well will usually cool the water so much that the heat pump will shut off on it s low pres sure temperature safety control A return well should be a minimum of 25 m from the supply well for residential applications The water returned to the well will not be necessarily be pumped into the same aqui fer depending on underground conditions but the return well does have to be able to supply the same quantity of water as the amount you wish to recharge into it If the static level level when not being pumped of a well is high 3 to 6 m from the surface it may be necessary to place a watertight well cap on the well to keep the return wa ter from flowing out the top of the well This cap is com monly required since a certain amount of pressure 1s needed to force the return water back down the well if the static level is high Return wells are not always the answer and to some it may be more satisfactory to pump the water to a pond or away into the woods Water recharged naturally through percolation into the soil is an alternative to a recharge well The water discharged will generally soak into the ground within a distance of 15 to 30 m If care is taken to make sure the end of the pipe does not freeze then this method of disposal works well Safety Controls The NORDIC reversible W series heat pump has three built in safety controls whic
36. nimum a closed secon dary heat exchange system is constructed with Type 3408 Polyethylene Plastic Pipe specifically engineered for the job Materials such as PVC and polybutylene are not recom mended since their underground joining process is not as reli able as the fusion process used with type 3408 polyethylene The earthloop heat exchanger can consist of a single long length of plastic commonly called a series style heat ex changer or more commonly is found as a number of parallel loops connected to a reverse return header system The se ries system for homes or light commercial applications up to 10 tons normally is constructed with 32 to 51 mm diameter pipe while the parallel system uses multiple branch loops from 19 to 23 mm connected to a larger header pipe system of 32 to 38 mm diameter The parallel system offers several ad vantages such as e Less expensive pipe e Easier to handle the smaller pipe e Lower pressure drop e Smaller circulator pump s Of course on larger commercial systems it would not be unusual to find header systems with up to 152 mm diameter pipe for fluid flow into and out of the building Socket Fusion Mechanical joints or metal fittings of any kind are not acceptable underground in an earth loop system due to large temperature fluctuations which may loosen and break clamps and the possibility of eventual corrosion perforation in cou plings and Ts Fittings and joints are socket or butt fused t
37. nitial Pressurization At this point open all valves in the flow circuit and slowly close off the supply and return flush cart valves in a manner that leaves about 175 300 kPa on the system If an air bladder expansion tank is used the bladder should be charged to the above pressure before actual water pressure is put on the system Systems employing a commercially available loop pump kit that do not have an expansion tank thermometers and pressure gauges will experience a greater fluctuation of pressure in the loop between winter and summer This fluctuation is normal since expansion and contraction of the loop fluid must be handled by the elasticity of the plastic loop Pressurize the loop to a pressure of 300 kPa when installing a system in the fall going into the heating season If installing in spring or summer charge to 175 kPa After operating the machine for a period of time any residual air in the system can be bled off through valved verti cal standpipes in the pump module If pressure drops below 175 kPa add additional water antifreeze mix with the purge pump to bring the pressure back to the original setting 17 Feb 00 Maritime Geothermal Ltd NORDIC Horizontal Trench Design N Closed loop Plastic Earthloop Next trench line Elevation View Next trench line A Y Backfill with heavy dense material if excavated material contains rock which may damage the tubing 1 8 m l 19 mm
38. nk should have an additional 19 mm fitting at M to allow for an immersion well style probe thermostat This control works during the cooling mode to shut down the compressor as in A above If one of these controls trips it will activate a LOCK OUT RELAY which prevents the unit from restart ing until power to the control circuit is broken by turning the thermostat to the OFF position and then back on again or the electrical supply to the unit is broken by opening the heat pump breaker and then closing it again If one of these con trols trips there is a serious problem with the system and it must be rectified if the unit is to maintain good service NOTE Under no circumstances should the heat pump lock out relay be reset more than twice in an hour If the heat pump is shutting off because of LOW or NO water flow then repeated resetting of the unit could cause the heat exchanger to freeze and rupture destroying the heat pump Page Electrical Connections The NORDIC unit is supplied with an opening for 19 mm conduit nipple on the right side of the unit An additional knockout 13 mm is provided to facilitate connection of an external circulator pump to the set of dry contacts provided Above this is another 9 5 mm hole for the thermostat wire A wiring diagram is located inside the electrical box cover for quick reference and although the connections to be made are quite simple Maritime Geothermal Ltd recommends that
39. ogether into one contiguous unit using a technique developed by the gas industry A heater tool with the appropriate faces heats both the pipe and fitting for a prescribed period of time and then the two pieces are quickly removed from the heater inserted together and held in place until the joint cools When properly done the resulting joint is stronger than the original pipe with no chance of leaks or breaks For more information on butt and socket fusion techniques see our website at http www discribe ca nordic fusion htm or request a copy of the Cen tral Tools Butt and Socket fusion manual Page Horizontal Groundloops Horizontal groundloop systems are most commonly used where land is readily available since they are cheaper to construct than their vertical counterparts Although many con figurations are available we have found that a parallel system with one 1 150m U pipe per ton placed in a 76m x 1 3m wide x 1 8m deep trench is easy to construct and provides ample ground impact area to adequately supply a 0 C or bet ter Entering Fluid Temperature to the heat pump even in the most severe winter months See opposite Diagram A Several companies including Thermalworks and the International Ground Source Heat Pump Association igshpa provide modeling software to size the heat pump to the home and then size the loop to the demand of the home and heat pump Consideration is given to many factors such as type of
40. onent 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 im proper installation repair or improper testing Page 36
41. orm entering water temp EWT to leaving water temp LWT Electrical Supply and Thermostat Wire Sizes 380v 3 50 Micrapis 9 n o 2 3 _ Drazed Plate Heat Exchanger Water Flow Vs Pressure drop Tables kPa Page 25 Feb 00 Maritime Geothermal Ltd W 45ec HAC Nominal 3 ton Heating Source Data Power Consumption Sink Data mmmn EAT a E E il ES A ll A u s A GO O CG O A A E IU II E A II a a E E gt o E EA Kum Kz mm mn IS IS um am ma EA Kua Rm m A E NA A A EA A IA UA EA E DECO A wam A A O E E SA AA E um En DI mms IO ma mau man maa ka EA A Rm A ESENCE KD WC GS OG Em NE A A A E a A E E EA Ts A man O O O uma ama A A Ka us RS RR E E A E A A GR E EE O us CS s A A A E AA E e _ A CPT 1 ah IO ee K Es a ee a ae paapejoo la eee e pe Pps Pet ZR40K3 TFD 3phase Model W 45ec HAC Nominal 3 ton Cooling ESE MENE la ni Ml eal el A kaiq Btu s AAA AAA AAA ECG A CO IA CS DS I mas AAA AAA AAA i EGO DE MO A E E DC ALEA A A AA AA EEG mm CA CA O O 0 II EA E EA IA EMI A A AE AI AAA A APA AA A A E E EA EE EEC IA IE E AA AA AAA AAA AAA A GO O GO GO O O O O A A IGG AAA ALLA APA SPP E ZR40K3 TFD 3phase Model Page 26 Maritime Geothermal Ltd Feb 00 W 55ec HAC Nominal 4 ton Heating Source Data Power Consumption Sink Data Ee EAT Hd A a ES ll A u s A O O CG O GA A E IU e IA s a ez sa e E BA REA EIC m m m mun am Sea Ka kakun Km m A E l
42. ps Models Wec 45 175 380 3 50 Date June 1998 Drawn By G Kaye Title Schematic Diagram A Maritime Geothermal Ltd NORDIC W H W 380 3 50 Unit Schemetic Diagram H HW HAC HACW i 380 3 50 I 1 Amp Fuse ip 220 1154 A Time Delay o N NOTE a y E ova AY Water To temporarily disconnect l l dy Circulator pump remove wire I from terminal T3 marked with 380 3 50 1 380 3 50 N N N red tape See A at left A i I l l U T3 I I I T2 i Pela T2 I I T1 T1 Control transformer 50 va 24v Thermostat Connections Amp ruse ao A Time Delay Lock out relay 3 4 R 0 Comp relay coil E pi Thermostat h fe Y o 21 5 Wiring Pine u e O r gt i A High Pres Low Pres e C Aux relay coil yn Tr Reversing valve coil only on HAC or HACW models ea a cl Page 34 Maritime Geothermal Ltd Feb 00 Maritime Geothermal Ltd EC Model Liquid to Liquid Heat Pumps Models W 45 55 65 380 3 7 50 Date June 1998 Drawn By G Kaye Title Electrical Box Connections A Maritime Geothermal Ltd NORDIC W HACW 380v 3Ph 50Hz Models Field Wiring
43. r relay Check for air or strainer restrictions Water valves open TXV possibly not opening Warm bulb with hand and observe Replace TXV or filter drier 1d Liquid line possibly plugged suction pressure while operating non operational or plugged Circulator pump not operating Use an amprobe to measure current Replace if faulty Blockage or restriction in the Check water flow and power to Remove obstruction in water water line or hot water heat pump Check water lines for obstruc lines Acid treat the domestic hot exchanger tion water coil Thermostat limit is open Check contact operation Should Replace thermostat if faulty close at 49 C and open at 57 C Disconnect switch open or Check both line and load sides of Replace blown fuse or breaker or fuse blown in electrical supply fuses If switch is open determine close switch to hot water tank why Reset button tripped on hot Check voltage at elements with mul Push reset button water tank timeter Thermostat on hot water tank Visually inspect the setting Readjust the setting to 49 C set too low Should be set at 49 C Heat pump not running enough Note the amount of time the heat Temporarily turn up the tank ther hours to make sufficient hot pump runs in any given hour mostats until colder weather cre water ates longer run cycles Page 33 Feb 00 Maritime Geothermal Ltd Maritime Geothermal Ltd EC Model Liquid to Liquid Heat Pum
44. s s amp Pressure Supply water flow to the heat pump can be con PIT Plugs Pete s Plug Protective Cover Included lli nae Fittings and accessories available for P T plug application to heat pump ares Feb 00 Maritime Geothermal Ltd NORDIC W Series Typical Plumbing Aquastat Minimum line size 25 mm Boiler drain Boiler feed for Air Release pressure re Pressure gauge 80 to 10 kPa Manual Vent 4m 5 To and form Well gt 5 l or Groundloop n Thermometer HW GO 400 Ltr Pressure relief valve set at lt Ball Valve E00 ta 700 KPA Electric Hot Water Distribution Tank II lt Circulator Pump Taco 0011 or Grundfos UP 26 99 high velocity IA gt Pa pasas yy DF or DC 0 or DXW Heat Pump Minimum line size 25 mm Zone Valves LLL ZONE 1 ZONE 3 ZONE 2 ZONE 4 Page 6 Maritime Geothermal Ltd trolled very accurately by the installation of a reverse action pressure valve in the supply water discharge line of the unit If the unit is a heati
45. s ing water flow TXV stuck closed Filter drier plugged Verification Thermostat not calling for heat High or low pressure limit open Lock out relay energized Normal operation except too frequent starting and stopping Check for continuity through internal overload in compressor Manually open water valve if equipped and measure water flow with a flowmeter Measure temperature of water Check flow rate with spec sheet to determine 1f proper gpm is available Refrigerant pressure control should open on drop at approx 310 kPa for well opera tion and 240 kPa for closed loop application Check water temp and flow Clean heat exchanger If suction is still low check suction gas pres Normal suction is 345 415 380 typical on R 22 or R 407C Check condenser flow with flowmeter Check for refrigerant flow through TX V and filter Pase Z 32 Maritime Geothermal Ltd Recommended Action Locate open control and determine cause Replace faulty control if necessary Check for loose wiring Check differential setting on aquastat Widen setting to allow longer run cycles Observe suction amp discharge pressures make sure amp draw is within range Check well pump or circ pump for proper operation Check water valve for proper operation Increase flow to proper gpm for tempera ture of water used The low control should reset automatically when refrigerant pressure reaches 450 to 485 kPa H
46. stall T as shown piping arrangement to dif below fer from those shown at Check I left dl I 49 C Follow the labeling on Valve your unit I a _ I T gt Hot OUT Air Bladder Tang Optional T 50 Micron Supply Out C Strainer gt Optional Dole k g flow restrictor Supply IN Page 11 Feb 00 Maritime Geothermal Ltd Diagram A Design 1 Design 2 Parallel piping Reverse Return Header System Series piping 1 or 4 pipes per trench Diagram A Shown above are several of the many possible horizontal loop layouts which have been successfully employed in vari ous types of ground conditions Design 1 Shown is a typical reverse return header system and 2 parallel loops On a 2 ton system each of these loops would be 150m long with 1 3m spacing between the U sections 3m spacing between the loops and buried 1 8m underground Design 2 is a single loop of 32 to 38 mm diameter pipe with a length of 150m x the tonnage of the system and buried to a depth of 1 8m underground Individual runs of pipe should be kept a minimum of 3m apart Diagram B Design 3 Vertical Parallel Vertical Series Design 3 Shown 1s a vertical borehole reverse return header system Vertical systems generally require 40 to 55m of borehole per ton of heat pump for successful heat transfer to take place with the earth Boreholes should be spaced a minimum of 3m apart while if
47. t is equipped with a scroll compressor which must rotate in the proper direction After initial connection start the compressor while observing the suction and discharge pressures with a refrigeration guage set If the compressor is not pumping reverse supply conductors L1 and L2 and then recheck Reversing any two of the three input wires to a three phase motor will C reverse the direction of the motor J Page 35 Feb 00 Maritime Geothermal Ltd O LIMITED WARRANTY MARITIME GEOTHERMAL LTD warrants that the heat pumps manufactured 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 GEOTHER MAL LTD transportation charges prepaid which upon examination proves to be defective in materials or workmanship Replacement or repaired parts and compo nents are warranted only for the remaining portion of the original warranty period This warranty is subject to the following conditions I The NORDIC heat pump must be proper
48. ted to the circulator pump module with a lineset suitable for the flow required with mini mum pressure drop Common line sizes would be 19 mm rub ber or plastic for heat pumps from 1 to 2 5 ton while for unit sizes 3 through 5 ton 25 mm lines should be used The instal lation of P T plugs pressure temperature pronounced Pete s plugs should be installed on both the entering and leaving lines at the heat pump The P T plug will allow the installer or homeowner to check water flow through the loop by measuring the pressure difference through the heat ex changer and comparing this pressure drop to that of the appro priate model in the engineering section See Pressure Drop vs Water Flow Table Table 2 Litres of fluid per 30 meters of pipe Diameter Volume Litres Type of Pipe Copper Rubber Hose Polyethylene 381 mm x 9 m high Flushing amp Purging the Earthloop Once the earthloop has been installed and all connec tions are completed to the heat pump and pumping station the entire plumbing system should be pressure tested with air to 690 kPa to make sure there are no leaks on any of the inside fittings Soap all joints and observe that the pressure remains Heat Exchanger Flush Cart Tank 15 Maritime Geothermal Ltd Feb 00 ajddiu ajep ww 61 Z L adid doojype a oNseid 8076 Ad WW ZE pa L AEB WU 6 L L MOQIS 06 80VE Ad WU ZE EZ LAN WU 61 aajea 491 91 annssaud ex 00S
49. type 3408 Plastic Undisturbed laid in each corner Soil lt 3m gt lt 13m gt 3m s IMPORTANT NOTES Horizontal style pipe runs should be placed 1 8 m deep a minimum of 1 3 m wide trench as shown above Hand backfilling in the area just over the plastic is recommended to prevent crushing or pinch ing the pipe during backfilling operations Individual trenches 1 per ton should be spaced a mini mum of 3 m apart to allow the best performance of the ground field See additional diagrams for pump and piping information LA AAA Excavated Trench W Insulate all in A side piping with Armaflex B closed cell in sulation 10 mm minimum l Pe thickness Basement floor Insulate all lines within 3 m of the foundation with 10 mm armaflex Page 18 Maritime Geothermal Ltd Feb 00 Interior Loop Pump 3 way Fill Valve Valve Assembly 1 Fill amp Purge access ports Basement Wall Heat Mounting Clamps Pump pe _ Transition Adaptor 3408 to male thread I 32mm PE 3408 Ql TN
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