NORDIC
Contents
1. BACK SIDE Return Air Side m BLOWER DOOR Actual G 1 Blower 13 5 x 15 4 ee FRONT VIEW I y LEFT SIDE DOQ 31 H x 22 W Sate eee s a N 4 D e LEFT SIDE VII Page 19 12 2003 Maritime Geothermal Ltd NORDIC External Wiring Geothermal Heat Pumps Thermostat Disconnect Switch Nominal BTU output Minimum wire size 8 3 8 3 6 3 Max Fuse Size 40 40 50 Thermostat wire size 18 18 18 Thermostat conductors 8 8 8 18 2 conductor NOTE 18 3 conductor required if external pump relay employed Domestic Hot Water Generator Specifications Maritime Geothermal Ltd 7 Feb 00 Maritime Geothermal Ltd Color Caissie Grey Liquid to Air Heat Pumps Models TF 45 55 65 Style Vertical Date June 1999 Drawn By G Kaye Premium Features Triple Function Series valve Title Cabinet amp Piping Layout Return Air Filter Oversize high efficiency air coil Belt drive blower with ball bearings High efficiency ball bearing PSC style motor Galvanized drip tray Sight glass optional Suction accumulator Bi flow filter driers Thermostatic expansion Baked enamel cabinet with satin galvanized condensate tray and floor Components accessible from three sides Heavy duty electrical components Hard start kit on all models Bl2. Main Condense OUT NOTE Infloor Ports on the Hot Header Header Buffer Tank at right should be Zone Valves minimum 1 m LEGEND 1 Domestic Hot Water IN 2 Domestic Hot Water OUT 3 Well or Groundloop Liquid OUT 4 Well or Groundloop Liquid IN 5 Primary HOT WATER OUT 6 Primary HOT WATER IN Floor Zone s Maritime Geothermal Ltd Page 12 Maritime Geothermal Ltd 7 Feb 00 Triple Function with Infloor Heating Systems NORDIC TF heat pumps have been successfully used as the prime heat source for under floor heating systems in many applications The following information is intended to enable a dealer to install the hot water side of such a system successfully Heat Pump Selection The heat pump should be selected on the basis of heat loss in the building just as it normally would be done with a typical water to air unit The Triple Function model chosen has to be large enough to cool the section of the structure served by the air side as well as the infloor section served by the water side Once the size has been selected then the proper evaporator water flow and correct pump for the system can be determined from the engineering section The remainder of this information 15 dedicated to the distribution of heat from the heat pump into the concrete floor Floor Preparation Concrete floor heating systems provide good performance when the following steps are
3. 2003 Maritime Geothermal Ltd NORDIC Series Alternate Plumbing 4 Port hot buffer tank Desuperheaer HOT 1 2 copper lines Insulate with 5 8 Armaflex Domestic HOT TF Heat Pump C Coe Domestic DN Ka LA AKA AAI j 60 65 C i RON EE Electric or i 3 75 Psig QE 5 Ball Gas Pressure Valve or Relief 6 T Tx Valve Insulated HOT B WATER ec lt Valve IANS 7 T Loop or Well IN Drain Loop or Well OUT HOT Main Condenser HOT Main Candense OUT NOTE Thenncsiat Supply Infloor Ports on the Hot 1 Lines Header Header Buffer Tank at right should be Zone Valves minimum 1 Header LEGEND 1 Domestic Hot Water IN 2 Damestic Hot Water OUT Floor Zone s 3 Well or Groundloop Liquid OUT 4 Well or Groundloop Liquid IN 5 Primary HOT WATER QUT 86 Primary HOT WATER IN Maritime Geothermal Ltd Page 8 Maritime Geothermal Ltd Electrical NORDIC TF models The NORDIC unit is supplied with an opening for 3 4 conduit nipple on the right blank side of the unit An additional knockout 1 2 is provided to facilitate connection of a plenum heater blower control wire if required Above this is another 3 8 hole for the thermostat wire A wiring diagram is located inside the electrical box cover for quick reference and although the connections to be m
4. be adjusted to approx 12 15 psig 2 Select a circulator pump of suitable capacity to circulate the working fluid fast enough to keep the head pressure of the heat pump in the range of 225 to 290 psig and produce a temperature drop of 8 to 15 deg F across the hot water heat exchanger The pump selected should be of the smallest type that will provide adequate circulation thus minimizing the power consumption of the entire system On most applications a typical GrunTFos UP 26 99 or a TACO Model 0011 circulator will be adequate The amount of fluid needed to cool the heat pumps condenser is directly proportional to the size of the heat pump and the amount of floor area plumbed to radiate the heat produced 3 Unions or some other type of disconnect should be placed as shown on the diagrams to facilitate the changing or servicing of the circulator pump or heat pump If shut off valves are placed as shown the indiviTriple components can be isolated if required during start up or for servicing 4 The pressure relief valves are used to prevent the build up of pressure in the system should the system be started while the condenseris isolated 5 All valving is done with full port ball valves to minimize pressure drop associated with globe valves 6 The boiler drains shown on the vertical riser pipes are to allow manual removal of air from the system when initially charging the system with water or methanol water solution A methanol water ant
5. 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 accordance 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 installation 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 water 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 provided that 1 MARITIME Geothermal LTD is promptly notified in writing upon discovery by the customer
6. 230 115V Spec L3 ote If heat pump is to be operated connected to the water tank and flooded with water remove the wire marked with RED tape located here This pump is water lubricated and must not be run dry L2 without the hot water circulator Heat Pump Flectrical Service Requirements hs 2 15v Connections ii 1 phase BO Hz 230v A Compressor relay Min Circuit Suppl TD fuse or Thermostat Connect L3 to Black Ampaci Wie Breaker Wire Connect L2 to Neutral middle Lenn nal as showr al Ic Connect L1 to Red Connect Gnd to gnd lug Page 28 Maritime Geothermal Ltd 7 Feb 00 NORDIC Series Aquastat Wiring Aquastat Wiring Theory of Operation Heat Purnp Terminal Box Ranca Aquastat eY w y gt F Wi lele 8 8 8 8 858 88 8 6 Connections Required Connect C from HP terminal box to COM in aquastat Connect O W2 from HP terminal box to C of stage 2 in aquastat Connect RA from HP terminal box to C of stage 1 AND 24V terminal in aquastat Connect YA from HF terminal box to NO of stage 1 in aquastat Connect OA from HP terminal box to NC of stage 2 in aquastat Aquastat Settings When setting aquastat setpoints stage 1 51 and stage 2 52 settings MUST be set at the same temperature setpoint with the same differential The reason for this is reversing valve 1 must be disconnected in order to allow the discharge gas of the compressor to go the water
7. Allow a minimum of 10 fl between each trench and preferably 15 20 ft if space is available Building is slab on grade construction with heat provided by hot water pumped through tubing embedded in the slab 604 ee 40 ft BUILDING Page 31 UM C A pow Insulate all tubing within 12 of the structure with 3 4 closed cell armaflex insulation Piping that is laid in a hcadcr trench should be insulated to a point where each loop branches to it s individual trench Loop 4 shown above could be uninsulated to pick up heat in the header trench as long as the header trench is more Ilhan 12 out from Ihe building 12 2003 Maritime Geothermal Ltd 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 GEOTHERMAL LTD transportation charges prepaid which
8. down if the refrigerant evaporating pressure becomes 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 9 Low water flow See requirements for each mode Low water temperature Below 40 deg F Dirty or fouled heat exchanger Low refrigerant charge 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 there is an interruption in air flow Such a situation could occur if the blower motor or fan belt failed or if the heat pump had an extremely dirty air filter If either of these controls trips it will activate a LOCK OUT RELAY which prevents the unit from restarting 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 controls 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 12
9. that such part or component fails to conform to this warranty 2 The customer returns such part or component to MARITIME GEOTHERMAL LTD transportation Page 32
10. 3 Well or Groundloop Liquid OUT 4 Well or Groundlaop Liquid IN 5 Primary HOT WATER OUT 6 Primary HOT WATER IN AGMINE i Maritime Geothermal Ltd Page 6 Maritime Geothermal Ltd 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 40 gal 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 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 the system before the unit is started Repeat this procedure until all air is purged from the system 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 is flowing The thermostats on the hot water tank should be set to 120 F since the heat pump has an internal thermostat set at a low of 130 deg F By setting the tank thermostats as described the heat pump will try to keep the tank above the c
11. Maritime Geothermal Ltd Optimum Placement Plumbing the Heat Pump NORDIC models TF 45 55 65 Heat Pump System Requirements Triple Function Table of Contents Dual Function amp Infloor Heating 13 Geothermal Heat Pumps CFM available Trouble Shooting Guide Electrical Schemetic Revision 1 0 7 Feb 00 Safety Controls Component Layout Electrical Boc Starting the Heat Pump Maintenance S ees MANN Vertical Case P O Box 2555 Petitcodiac N B gt AA Performance Ratings S N Maritime Geothermal Ltd EAZ 6H4 Duct sizing Guide Warranty ac 4 XI NSN ROKR KRY oS SS RRR YY RRR RAR KKK ASSI NN Horizontal Case Hot WATER Active AIR Cooling Heating 48 LR 56328 Email nordic 2auracom com www discribe ca nordic 12 2003 Maritime Geothermal Ltd A NORDIC Triple Function Open Loop System Water Pump System RDI R x T t t 1 adiant Heating Heat Pump Warm Cool Air Disposal of thermally altered water Subsurface Irrigation Domestic Pond Lake Return Well Leaching Surface Page 2 Maritime Geothermal Ltd 7 Feb 00 NORDIC TF Heat Pump Prerequisites There are fiv
12. ade are quite simple Maritime Geothermal Ltd recommends that a properly qualified electrician be retained to make the connections and wire the thermostat The NORDIC unit comes supplied with a thermostat and connections are clearly marked on the control box Using a 8 conductor 18 gauge wire suitable for the job connect the terminals in the heat pump electrical box to the corresponding terminals on the thermostat An additional 4 conductor wire will be required for low voltage control of a NORDIC plenum heater if required Ductwork Ductwork layout fora NORDIC heat pump will differ from normal design in the number of leads and size of main trunks required Air temperature leaving the heat pump is normally 95 to 105 F much cooler than that of a conventional warm air furnace To compensate for this larger volumes of lower temperature air must be moved and consequently duct sizing must be able to accommodate the greater air flow without creating a higher static pressure or high velocity at the floor diffusers Maritime Geothermal Ltd recommends that the static pressure be kept below 2 inches of water total Return ducts should ideally be placed in every room and be sized 50 larger than corresponding supplies In some instances the number of floor diffusers will actually double when compared to the number that would normally be used for a warm air oil fired furnace NOTE See the duct sizing chart in the engineering section
13. air conditioning Open control circuit Compressor repeatedly locks out on it s LOW pressure safety control Intermittent contact in electrical control circuit Low water flow Thermostat not calling for heat High or low pressure limit open Lock out relay energized Open contacts on low pressure safety limit switch Lock out relay energized Water heat exchanger frozen Normal operation except too frequent starting and stopping Manually open water valve and measure water flow with a flowmeter 7 Feb 00 Locate open control and determine cause Replace faulty control if necessary Check for low or no water Restore proper water flow Thaw out heat exchanger Check anticipator in thermostat Make sure setting is for longest cycle or max amps Check well pump for proper operation Check water valve for proper operation Replace Water supply too cold Ambient air too cold Faulty low pressure ctrl Faulty low temp ctrl Low refrigerant charge No water flow Unit trips out on it s high pressure limit Measure temperature of water Check flow rate with spec sheet to determine if proper gpm is available Measure return air temp Should be above 60 F Refrigerant pressure control should open on drop at approx 45 psig Temp ctrl will open in about 1 minute if water flow is interrupted or if unit is run with suction pressure below 50
14. ay cause damage to the circulator pump housing When the home has come up to temperature open the valve for normal hot water operation Slightly open the union on the hot water discharge pipe to make sure that all air is out of the system and the circulator pump is flooded with water Make sure the air filter is clean and in place Vacuum out any dust and debris that may have collected in the unit during installation Check the condensate drain to be sure that it is free of obstruction Make sure the unit is sitting level so that condensate water will not overflow the catch pan Make sure the proper time delay fuse has been installed in the fuse box Have the following tools on hand and know how to use them A A refrigeration gauge set B An electronic or other accurate thermomete C An amprobe D A water flow meter TF Thermostat Function The room thermostat on a TF unit decides whether the home is in HEATING or COOLING mode The mode selection switch can be set for HEAT COOL OFF or AUTO by the homeowner OFF All systems OFF HEAT This position allows the hot buffer tank aquastat to operate the heat pump compressor and associated circulator pump The blower will not operate in this mode Individual thermostats in each zone or room of the building control the flow of hot water from the buffer tank to the floor Setting the main room thermostat temperature up or down will have no effect on the operation of th
15. b 00 NORDIC TF Series Schematic Wiring Diagram HW Unit Schemetic Diagram No Water Valve 115v R Jp Start Cap NOTE To temporarily disconnect circulator pump remove wire marked with red tape from bottom right terminal on compressor relay Marked A on diagram at left relay Td Low Pres High Pres Electric Reversing Valva 1 Aquastat Page 27 12 2003 Maritime Geothermal Ltd NORDIC TF Series Electrical Box Connections Electrical Box Block Wiring Diagram Field Wiring Low Voltage Wiring Sii Use an 18 8 conductor cable Field Connect C Y Y2 R L W W1 O W2 T stat in terminal box to the corresponding Wiring letters on the thermostat supplied 24v AC C common G blower Y Y2 compressor R hot supply a sYn oe L Compressor lock out light may W Wi Plenum heater relay Sida Back up O W Reversing Valve Use an 18 4 wire to connect FF to in heater Lockoul Priorily Walter Heal Relay Relay Relay to in heater AGUAS tat Wiring Compressor 24v Use a 18 5 wire to connect C O W2 Run Cap Gnd Potential RA YA OA from terminal strip to 20 24v Relay terminals in aquastat See following control Irans ormer diagram for details e Wiring Hot water Circulator Pump
16. cing steel should then be laid over the plastic heating pipes to increase the strength of the concrete floor The mesh pattern provides a good method of fastening the piping in place by tying the pipes at intervals so that they will not move during the pouring if the concrete Page slab 5 Tie the header pipes up in position and plug the ends so that foreign material cannot enter and pour the slab The thickness of the slab will have some bearing on the heat retention ability of the system with a thicker slab taking longer to heat up initially and of course taking longer to cool down in the case of a power failure 6 Insulate around the outside perimeter of the concrete slab by gluing or otherwise fastening styrofoam vertically to the outside edge of the concrete slab as shown Diagram D One of the unique features of the concrete slab is it s inherent ability to provide continuing heat through electrical power failures of several hours duration Equipment Description and Use Components shown in the accompanying diagrams are incorporated into the system in the following manner 1 Expansion tank provides an area for the liquid in the floor to expand when heated by the heat pump It should be sized large enough to accommodate the expansion of the working fluid when heated to its hottest state Typically 120 F A 10 gallon equivalent tank with an air bladder is acceptable in most cases The internal pressure of the tank can
17. ct switch Ohmmeter shows no resistance between common and run terminals or between common and start terminals Note Be sure compressor overload has had a chance to reset 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 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 is faulty replace compressor Faulty compressor contactor Seized compressor due to locked or damaged mechanism Faulty run capacitor 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 24 Replace contactor Attempt to rock compressor free If normal operation cannot be established replace compressor Replace if faulty Maritime Geothermal Ltd Compressor not operating Compressor short cycles Unit trips off on LOW suction pressure control Low or
18. d be approximately 50 to 60 psig while the head or discharge pressure red gauge should be in the area of 200 to 300 psig NOTE The suction pressure LOW gauge will be affected by the volume and temperature of water flowing from the well or groundloop through the machine Larger flow and higher temperature will both increase the suction pressure which in turn increases the COP or efficiency of the unit The discharge pressure HIGH gauge will be affected by the temperature and flow of water from the hot buffer tank Cooler water will lower the discharge pressure while lower water flow will tend to raise the discharge pressure Normal operating range for a buffer tank cycling between 110 F and 120 will be about 260 Psig to 300 Psig Record this information on the warranty test card Using an electronic thermometer or other accurate thermometer record the supply water temperature from your well or groundloop IN and the water temperature OUT The outlet water temperature should be from 4 to 7 degrees cooler than the inlet water temperature Record the supply water flow in gpm At the electrical disconnect switch place the amprobe jaws around the supply wires and record the current in each Cooling Check Out Place the thermostat function selector in the COOL position and turn down the stat to a temperature that will cause the air conditioning to begin When the thermostat selector switch is set in the COOL mode the
19. e backup heat by simply using an electric hot water tank as the storage tank The zone valves used on the system can end switches wired so that the circulator be of whatever variety that you choose with comes on as required Page 15 7 Feb 00 12 2003 Maritime Geothermal Ltd Maritime Geothermal Ltd Color Caissie Grey Dual Function Heat Pumps Models TF 45 55 65 RENE Date June 1997 Drawn By G Kaye Title Preheating Hot Water Hot OUT from TF EM or W Hot IN from TF EM or W series unit Infloor Supply Header f Return Header jom Zone Valve or Telestat Pre heat Final Electric Insulated Domestic Hot Hol Waler Water Tank Tank i Out to Home PRV amp 125 psi Internal Heat Exchanger Domestic Cold Water IN l Ball Valve eck Valve Ch m teg Pressure Relief A Valve Boiler drain Tor I initial purging Desuperheater Desuperheater Geothermal Heat Pumps QUT IN Page 16 12 2003 Maritime Geothermal Ltd Maritime Geothermal Ltd Color Caissie Grey Liquid to Air Heat Pumps Models TF 45 55 65 Style Vertical Date June 1999 Drawn By G Kaye Title Cabinet amp Piping Layout Cold Air Return NORDIC General Design Features Basic cabinet design 15 similar for all DF 45 55 65 A Coil Below series units Cold air return measures 27 x 30 5 Hot air plenum can be attached at any point
20. e compressor or the temperature in the home The thermostat will NOT automatically go into COOLING mode when set on HEAT The domestic hot water desuperheater functions in this mode COOL This position allows the room thermostat to operate the compressor and blower in the cooling mode Hot water making capability is disabled while in COOL mode The main room thermostat has full control of the heat pump therefore setting the temperature up or down will affect the temperature in the entire home The desuperheater functions during this mode AUTO In this position the thermostat automatically 12 2003 Maritime Geothermal Ltd NORDIC TF Series Preheat amp Final DHW Tanks NORDIC TF series Preheat Tank 4 HOT Water Tank Connections Desuperheaer 1 2 copper lines Insulate with 5 8 Armaflex HOT Domestic Domestic HOT Cold IN TF Heat Pump 0 65 C i Insulated Boiler 3 lE domestic Drain Electric Thermostat Preheat or 75 Psig Tank Gas Pressure Fu Relief Insulated Valve HOT E WATER Loop or Wel IN loot or Well OUT HOT Main Condenser HOT n eua OUT 4 Lines Lj 3 Header NOTE 5 507C eee Ports on the Hot Thermostat p Infloor Buffer Tank at 1 Buffer Headers right should be Tank minimum 1 Return Header LEGEND 1 Domestic Hot Water IN 2 Domestic Hot Wat
21. e specific parts or sub systems to a groundwater heat pump installation WPwWN Pr Water Well Requirements 1 A DRILLED well of 5 diameter or larger 2 Well casing properly sealed or grouted into rock 3 Water flow preferably entering well at a depth of 75 ft or more 4 Temperature of well at least 40 F Normally 45 F 5 Well must be able to supply requirements of BOTH heat pump and residence usage at the same time with maximum drawdown from static level of 30 ft Water Pump System 1 A submersible pump is generally required 2 Must be able to pump the required water flow listed at a minimum of 30 psig at the dynamic pumping depth of Nordic TF 45 The source of energy groundwater The method of supplying energy to the heat pump Converting the energy to a useable form Distributing the heat Returning the exhaust water to the earth for reheating Nordic TF 55 Nordic TF 65 your well 3 Make sure you select the pump using the pump manufacturers pump chart 4 Usea minimum of 30 gal equivalent air bladder tank Duct Systems A duct system capable of supplying the required air flow is of utmost importance Nordic TF 45 will heat up to 1800 sq ft Nordic TF 55 will heat up to 2700 sq ft Nordic TF 65 will heat up to 3500 sq ft Assuming at least R 20 walls and R 40 ceiling Generally allow 100 cfm for each f
22. er OUT E 3 Well or Groundloop Liquid OUT 4 Well or Groundloop Liquid IN 5 Primary HOT WATER QUT 6 Primary HOT WATER IN AMEN sonent Floor Zone s I E UL UE Maritime Geothermal Ltd Page 10 Maritime Geothermal Ltd selects the MODE ie HEAT or COOL based on the setpoints entered into the thermostat The stat will change back and forth from HEAT mode to COOL mode as required by changes in temperature in the home Heating Mode Check Out Connect the refrigerant gauge set to the high and low ports provided on the front of the machine NOTE Some machines have refrigerant gauges built into the unit If your heat pump is so equipped you will not need to attach a serviceman s gauge set but simply observe the readings on the built in gauges After the 4 hour warm up period place the thermostat function switch in the HEAT position On TF unit the central room thermostat set to the HEAT mode enables the AQUASTAT in the buffer tank to cycle the heat pump ON if it is calling for heat NOTE If the unit is equipped with an electric water valve it will take 30 to 60 seconds before you hear the compressor start Inside the TacoG valve an internal heater expands a push rod which opens the valve When the TACO water valve is fully open an internal switch activates the compressor circuit Observe the readings on the high and low pressure gauge set The suction pressure blue gauge shoul
23. essure temperature safety control A return well should be a minimum of 80 ft from the supply well for residential applications The water returned to Page 7 Feb 00 the well will not be necessarily be pumped into the same aquifer 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 10 to 20 ft from the surface it may be necessary to place a well cap on the well to keep the return water from flowing out the top of the well This cap is commonly required since a certain amount of pressure is 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 50 to 100 ft 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 heat pump has two built in safety controls which are designed to protect the unit from situations which could damage it 1 LOW PRES TEMPERATURE CONTROL The low refrigerant pressure temperature control is designed to shut the unit
24. followed 1 The base for the concrete slab must be prepared with material that pro motes good drainage such as coarse gravel or crushed rock Provision must be made for adequate drainage from underneath the gravel base by providing a network of drain tiles or by the natural lay of the land We recommend that the base be well compacted prior to pouring the concrete slab Good drainage is necessary since excessive accumulation of water under the slab will promote the loss of heat from the slab to the underlying earth thus reducing the efficiency of the system 2 Since our effort is to heat the building and not the surrounding grounds the underside of the concrete must be insulated with styrofoam Maritime Geothermal recommends 2 of the high density blue styrofoam or equivalent This styrofoam should be placed on top of the gravel base and under the entire surface area of the concrete slab 3 Plastic infloor heating pipes can next be laid on top of the styrofoam in the manner shown in the accompanying diagram We have found no disadvantage in the heating ability of the system by placing the piping at the interface of concrete and styrofoam and there is much less chance that it will be punctured when carpenters begin to drive cement nails for interior partitions etc Maritime Geothermal Ltd recommends that you make no splices in the piping under the floor since the most probable place for a leak would be at a splice 4 Wire mesh reinfor
25. heat exchanger Priority of Operation The TF series is designed to give priority to the air thermostat Whenever the air thermostat is calling for heating or cooling the aquastat is disconnected It is reconnected once the air temperature has been satisfied Page 29 12 2003 Maritime Geothermal Ltd CFM in inches Diameter CFM 2 25 x 10 3x8 3 5x6 4 x 5 5 5x5 5 37 226 4x15 5x12 6x10 7x8 10 304 9 5x15 6x12 7x10 8x9 12 24 14x20 16x17 165x 165 j 1750 2000 18 8x40 10x30 12x24 14x20 16x17 2000 sure eren ETE Dm ox pues per uem uim E Far 22x30 24x28 26x26 L rjr 6125 18 x 38 20 x 34 22 x 30 24x28 26x26 6500 7800 20 40 22 38 24 32 26 30 28 28 7800 ESSI s quee mes pese pes t 28x40 30x36 32x34 33x33 30x42 32x38 34x36 35x35 30x45 34x40 36 38 37x37 Page 30 Maritime Geothermal Ltd i 4 ie Example Piping Layout of Horizontal Closed Loop Heat Pump System ton system shown SO f l eee gt e Type 3408 PE tubing e Excavated trenches minimum 4 wide x 6 deep Note Trenches will be backfilled with material which will maximize the thermal conduclivity of the adjacent earth e Each loop consists of 500 ft of 3 4 type 3408 PE 160 psig SDR 11 geothermal heat pump polyethelene tubing e
26. ifreeze solution is used in a floor system whenever the building is heated only intermittently or when there is a possibility that the floor 13 12 2003 Maritime Geothermal Ltd Liquid to Air Heat Pumps Models TF 45 55 65 Multi Function Models Date May 12 2003 Drawn By G Kaye Title Desuperheater Connections to HW Tank Domestic Hot Water Tank 2 4 Line Out tp Home Thermometer Optional Z x Z x Cold Water IN from House 3 4 Line 1 2 Ball Valve Check Valve Boiler drain for En n initial purging Pressure Relief Valve 125 Psig Desuperhealer Desuperheater OUT IN Priming DHW Pump Close off ball valve A and open boiler drain B to force water at high volume and velocity through Ihe heal pump s domeslic hol waler exchanger lo initially prime the pump and purge air from the system When all air has been removed then close and open B for normal operation Maritime Geothermal Ltd Page 14 Maritime Geothermal Ltd might experience freezing conditions at some time 7 Thermometers placed as shown will register the temperature rise across the heat exchanger From this measurement you can determine whether more flow is required across the heat exchanger floor temp etc 8 Maritime Geothermal Ltd recommends that you install a boiler pressure reducing valve on the suction side of the circula
27. ight of the NORDICQ 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 2 x 4 lumber can be placed under the unit running from the electrical connection side to the filter rack side of the heat pump Laying the 2 x 4 s in this manner will give the best support since they will be at right angles with the internal steel compressor and heat exchanger supports Triple Function System Operation Triple Function heat pumps are essentially an R and a W series combination heat pump The addition of a second full condensing capability refrigerant to water heat exchanger allows the TF unit to function as a liquid to water heat pump whenever the unit is not calling for HEATING or COOLING via the duct system These units are ideally Page 7 Feb 00 suited to a home or business which will be heated with infloor heating and cooled via a conventional central duct system Switching of modes is done electronically via the room thermostat Units are available from 3 HP to 5 75 HP with either type 316 stainless steel exchangers or cupro nickel coaxial coils Duct design for a Triple Function unit is exactly the same as a regular R unit and hot water side plumbing is done in a similar fashion to a W series heat pump Plumbing the Supply Water Side of the Heat Pump The NORDIC heat pump must be supplied with an adequate wa
28. ir filter rack which can be removed for easy entry through a doorway or to facilitate moving the unit with a furniture cart Simply remove the two screws which hold the end cap in place slide the cap off and push the rack back off it s rails When the heat pump is in place the filter rack can be reinstalled with the removable end where the filter is changed facing the direction that allows easiest access for changing the filter To achieve the greatest efficiency the heat pump should be centrally located in the home with respect to the conditioned space This design provides the utmost in economy and comfort and usually can be accomplished in harmony with the design of the home A heating system cannot be expected to produce an even warmth throughout the household when it is located at one end of the structure and the warm air is transmitted with uninsulated metal ductwork If possible the three main service doors should remain clear of obstruction for a distance of 2 two ft so that servicing and general maintenance can be carried out with a minimum of difficulty Raising the heat pump off the floor a few inches by mounting it on a base 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 2 styrofoam covered with 1 4 plywood The styrofoam will smooth out any irregularities in the cement floor while the plywood will distribute the we
29. loor grill Page Water Well Water Pump System Heat Pump I Ductwork Water disposal All leads to the grills should be 6 in diameter 28 sq in each Your main hot air trunks should be at least 7596 of the square surface area of leads being fed at any given point Return air grills should have the same total square surface area as the total of your supply grills minimum Nordic TF 45 models 1600 cfm Nordic TF 55 models 1900 cfm Nordic TF 65 models 2100 cfm 80 F DB 67 F WB and static pres of 2 The square surface area of your return trunks should equal the square surface area of the grills being handled at any given Nordic TF 45 could have up to 16 hot air grills Nordic TF 55 could have up to 19 hot air grills Nordic TF 65 could have up to 21 hot air grills point along the trunk Itis VERY IMPORTANT that all turns in both the supply trunks and the return trunks be made with TURNING Remember that air is a fluid and just like water pressure drop is increased when air is forced to change direction rapidly around a sharp or irregular corner Discharge Water Methods You do NOT necessarily have to have a return well At least 50 of our customers do one of the following with their return or waste water 9 Run it into a drain or ditch Pond river or stream Leaching field In most instances if you run the water right out on top of the ground it
30. of such valves is needed they can be supplied and installed by your dealer All water line valves on both the supply and discharge 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 or loose heat when the heat pump is in operation therefore it is recommended that all loop or well water desuperheater and condenser lines be insulated with suitable insulation 12 2003 Maritime Geothermal Ltd NORDIC TF Series Typical Plumbing 2 Port hot buffer tank Desuperheaer HOT 1 2 copper lines Insulate with 5 8 Armaflex Domestic HOT Domestic gt Cold IN 3888 BAN 0444434443 FAN By QU OX 60 65 Boiler i Dean EH NE 75 Psig Ball Gas Pressure Y Fu Relief Insulated Valve HOT E 1 WATER Valve TANIK D n Loop or Well IN Drain Laop or Well CU I3 Condenser HOT Main 4 Lines Header Insulated NOTE Ports A and B on the Hot Buffer Thermostat 1 Hot Infleor Wat gd Headers Tank at right should be mini mum 1 Zone Valves 1 Check Valves LEGEND 1 Damestic Hot Water IN 2 Domestic Hot Water OUT E
31. of this manual Starting the Heat Pump BEFORE starting the heat pump the following areas should be rechecked to assure proper operation Check all high voltage field wiring and electrical connections inside the control box for good connection Check all low voltage thermostat to make sure they are connected properly Place thermostat HEAT OFF COOL switch in the OFF position Turn on the main power switch Allow the power to remain ON without starting the unit for a period of 4 hours Refrigerant migrates to the compressor oil when the compressor is unheated A crankcase heater is standard equipment on your heat pump and it will warm the compressor dispelling the liquid refrigerant Compressor damage can occur if the heat pump has been brought in from a cold location and immediately started up Page 7 Feb 00 Turn on the water supply and check all plumbing for leaks Check the hot water tank to be sure it is filled with water before energizing the circuit NOTE In a low ambient air start up the hot water tank should be energized for at least 4 hours before the heat pump is started A combination of low air temperature and 45 F water in the hot water tank can sometimes cause the unit to shut down on it s low pressure control If this happens close ONE valve in the hot water circuit to temporarily shut off the flow to the hot water generator Do not shut off both valves since water expanding in the hot water generator loop m
32. on top of the unit except within 6 of the filter rack To protect air coil below See line at left marked The filter rack is removeable to facilitate easy entry to the building and is reversible so that the filter can be removed from either side Blower opening outlet is for a G 12 blower in models 55 and 65 Model 45 units have a G 10 blower with dimensions 11 5 x 13 5 centered similar to the G 12 unit shown Blower Openmg Air Outlet _ Filter Rack Cold Air Return 1 BT ap Hot OUT 4 Hor IND Hot IN Thermostat Supply OUT Anxillary 3 4 TDi Lines Supply N Electric Scpply Right Side View Front View Unit cabinet constructed of 22 gauge satin galvanized material Floor and electrical box are 20 gauge satin galvanized Condensation tray is 20 gauge hot dipped galvanized Reinforcing devices are placed in all high stress areas for additional strength during transport Durable baked enamel finish 3 components easily acessible through three full length removeable doors Cabinet is fully insulated with flame retardant accoustic material LR 56328 Page 18 Maritime Geothermal Ltd 7 Feb 00 Maritime Geothermal Ltd Color Caissie Grey Liquid to Air Heat Pumps Models TF 45 55 65 Style Horizontal Date June 1999 Drawn By G Kaye Title Cabinet amp Piping Layout Refrigerant Air Filter rack area Electnic Box
33. ower motor field replaceable Page 21 Hot Condenser Out Hot Condenser In Domestic Hot Water IN Domestic Hot Water OUT Hot Water circulator High amp Low access ports Slow closing water valves High Efficiency coaxial heat exchanger Supply water OUT Supply water IN Insulated water coil High efficiency Tecumseh Remote reset lock out relay system Acoustically insulated cabinet Cabinet spot welded together for superior strength Removable and reversible filter rack 12 2003 Maritime Geothermal Ltd Hot 0 fee d peg ES cad El ES Ed ET Watts COP Pres Pres 40520 2 75 104 111 12 75 53908 172 3922 391 3 53 704 289 E us or n em pe pr 5 ema ro e ast oes pe onm Es 0 es ee ars e es emper vm aro we frre wes fee oar Cooling Ducted Air EWT Igpm Lpm Diff Water EAT LAT Diff i l Blower Total EER CSA Output Drop cooling Cooling Cooling Amps Watts EER 36 60 6 10 8 40987 5 38 79 5 64 16 30082 10549 40730 i 4 28 2363 17 2 12 7 36 2 79 7 10 1 36785 5 41 79 7 65 15 29125 9103 38502 4 23 2725 14 4 10 8 5 86 9 9 7 36755 29696 8211 38427 1427 2484 417 Comp ZR40K1 Scroll 33 Marathon G 10 Blower 2 row 6circuit air coil BTSSC 60 wate
34. psig Check water temp and flow Clean heat exchanger If suction is still low check return air temp Normal suction is 50 60 psig Check flow with flowmeter or other method Increase flow to proper gpm Restrict air flow temporarily until room comes up to temperature Both controls should reset automatically Heat 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 Check for possible leaks Check water pump operation Reversing valve stuck in the heating mode Unit works well in the heating mode but there is no loud rushing sound when unit is quickly switched to cooling mode Page 25 Check or replace valve solenoid and if necessary replace entire reversing valve assembly 12 2003 Maritime Geothermal Ltd Low or no air Open control circuit Thermostat not set to signal Turn room thermostat down conditioning operation Reduced air flow or Check for return air temperature 1 Dirty air filter 1 Replace filter too cold Unit trips out 2 Fan belt slipping 2 Tighten blower belt on low suction pressure 3 Broken blower belt 3 Replace belt control 4 Inoperative blower motor 4 Replace blower motor Insufficient hot Circulator pump not Visually inspect the pump to Replace if faulty water operating see if shaft is turning Use an amprobe to measure cur
35. r coil Voltage 230 1 60 Entering Air 70DB 60WB CFM 1650 External Static 15 WC BP 3 SS Hot Water Condenser In accordance with ARI 325 amp ARI 330 standards and CAN CSA C446 M94 Hot TY fae Pe er at E sF d E E E E E EUN j Watts COP Pres Pres 542 62 9 7 1 48418 3 82 104 113 12 9 0 64658 20 8 4758 393 346 302 sees s Jee vs e ei us em mo n so sn Ion n las n Air Output be cooling Cooling Cooling Amps Watts Amps ee BBR A 36 64 9 149 14 9 59450 58 80 1 56 25 38410 21940 61107 148 3104 339 3 39 raf en e ss s pen er n Ew pee e e ees or n re en or ne e mm eer pre pesos ses os ee es rr son ns e o Comp AV5549G BM 5 Marathon G 12 Blower 4 row 12 circuit air coil BTSSC 84 water coil Voltage 230 1 60 Entering Air 70DB 60WB CFM 1800 External Static 15 WC BPC 5 SS Heat In accordance with ARI 325 amp ARI 330 standards and CAN CSA C446 M94 Page 22 Maritime Geothermal Ltd 7 Feb 00 F Cold F F Btu s Drop F F Hot ap Out Amps Watts COP Pres Pres Ere e sez ers aa sreee vor via 12 sor feae fesa ore eo ve sez so see sez oe se preme som 70 one eee Em
36. rent draw Blockage or restriction Check water flow and power Remove obstruction in water in the water line or hot to pump Check water lines for lines Acid treat the domestic water heat exchanger obstruction hot water coil Thermostat limit is Check contact operation Replace thermostat if faulty open Should close at 120 F and open at 140 F Disconnect switch open Check both line and load sides Replace blown fuse or breaker or fuse blown in of fuses If switch is open or close switch electrical supply to hot determine why water tank Reset button tripped on Check voltage at elements Push reset button hot water tank with multimeter Thermostat on hot water Visually inspect the setting Readjust the setting to 120 F tank set too low Should be set at 120 F Heat pump not running Note the amount of time the Temporarily turn up the tank enough hours to make heat pump runs in any given thermostats until colder sufficient hot water hour weather creates longer run The Dole flow control is a simple self cleaning device designed to deliver a constant volume of water from any outlet whether the pressure is 15 psig or as high as E NET M 125 psi The controlling mechanism consists Oe AMO irte of a flexible orifice that varies it s area ed inversely with pressure so that a constant flow is maintained In line Flowmeter Page 26 Maritime Geothermal Ltd 7 Fe
37. reversing valve will be energized The blower should start followed by the compressor The outlet temperature will be approx 15 to 20 deg F cooler than the return air temp Page 7 Feb 00 General Maintenance As with any piece of equipment there will eventually be some maintenance to be done on the heat pump Several areas will need attention and they are as follows Change the air filter when required Clean the groundwater heat exchanger Well water applications only Inspect the blower belt for cracks amp wear Insure the condensate drain is clean Triple Function 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 are operating the unit from a water well or other open source of water and suspect that the water being pumped through the unit is of a poor quality or you notice a decrease in performance after several years of use it may be necessary to have the liquid heat exchanger cleaned Maritime Geothermal recommends that a qualified serviceman be retained to carry out this procedure since the solution involved is highly corrosive Hot Water Condenser Maintenance The hot water condensed side of a TF unit is equipped with a stainless steel brazed plate heat exchanger which is normally connected to an infloor heating sy
38. s ore pene ose vor voe wr foes ar wm as 2 EET TIEN TEES gt vs snos we ve ume mo woe aoe aoe Output Drop cooling Cooling Cooling Amps Watts Amps Watts Watts EER sez rz ra enr son se eere ers poer ano eo 70 363 87 1 16 6 59391 41381 20041 162109 26 36 4111 83 453 4564 77 8 555 93 6 16 8 58296 38988 19792 59457 27 28 4233 84 457 4690 Comp AV5558G BM HE 5 Marathon G 12 Blower 4 row 12 circuit air coil BTSSC 84 water coil Voltage 230 1 60 Entering Air 70DB 60WB 2050 External Static 2 WC BPC 5 SS Brazed In accordance with ARI 325 amp ARI 330 standards and CAN CSA C446 M94 8 2 85 5 41 8 3 15 5 83 12 2003 Maritime Geothermal Ltd NORDIC Series Trouble Shooting Guide Compressor not operating Power Failure Disconnect switch open Fuse blown Low voltage Burned out motor Thermal overload on compressor tripped Electric circuit test Shows no voltage on the line side of compressor contactor Voltmeter shows no voltage on the line side of the compressor contactor At heat pump disconnect box voltmeter shows voltage on the line side but not on the load side Voltmeter shows abnormally low voltage Below 210 v at heat pump disconne
39. stem pool spa or domestic hot water supply In any open loop application where constant new supplies of water and consequently new sources of minerals etc are introduced to the heat pump the condenser heat exchanger should be examined periodically to determine whether it is becoming corroded An easy method of determining whether the heat exchanger is fouled is to have your serviceman keep a record of the output water temperature and corresponding heat pump discharge pressure at start up each time he visits the unit over the years After several seasons of operation if the pressure becomes higher for a given output temperature then the heat exchanger may require cleaning Since the brazed plate exchanger is not manually cleanable then a cleaning solution such as that described for the evaporator coil will be necessary 11 12 2003 Maritime Geothermal Ltd Piping Layout for Infloor Heating NORDIC TF series Preheat Tank amp HOT Water Tank Connections Desuperheaer 1 2 copper lines Insulate with 5 8 Armaflex HOT Domestic Domestic Cold IN TF Heat Pump sak Mater i 60 65 Me Insulated Domestic Preheat Boiler lt Drain J Electric 75 Psig Bal Gas Pressure 5 Valvel T FEP Relief Insulated Valve WATER 22 Loop or Well IN Loop or Well CUT HOT
40. ter 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 Maritime Geothermal Ltd recommends the installation of a water flow meter on the discharge line so that the exact amount of water flowing can be determined at a glance Plumbing lines both supply and discharge must be of adequate size to handle the water flow necessary for the heat pump For distances less than 40 ft from the pressure tank 3 4 copper or plastic lines should be run while for longer distances we recommend that 1 should be run to the heat exchanger Similarly a 3 4 to 1 line should be run from the discharge pipe to the method if disposal 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 30 to 40 Psig 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 Water flow to the heat pump can be controlled very accurately by the installation of a REVERSE ACTION PRESSURE VALVE in the discharge line of the unit 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
41. tor pump to assist in the initial loading of the floor working fluid and also to provide positive pressure on the floor system at all times Zoning of Floor Systems There are basically two methods of installing NORDIC water to water heat pumps on a concrete floor heating system A The first method requires that the floor be able to reject the entire amount of heat produced by the heat pump at any given time There is no provision for storing the heat generated and therefore the circulation system and the radiating ability of the slab floor must be able to transfer the heat to the surrounding air as it is being produced This type of system would normally have only one zone and the heat produced would heat the entire building to an even temperature See diagram A Although a holding tank is not required in this application back up heat is easily provided by installing an electric hot water tank in the heat pump s hot water discharge line as described below B The second method involves the installation of a suitably sized holding tank from which hot water is distributed to several zones in the building as required The heat pump is installed so that it heats the water in the tank and shuts off when the tank temperature reaches approximately 120 deg F This system requires 2 circulator pumps rather than one and also a zone valve for each area zoned See diagram B One of the advantages of this system 15 that it is convenient to provid
42. ut in point of the electric element settings thus generating hot water from the heat pump only During summer or periods of high demand 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 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 Condensate Drain You will notice in the piping diagram that there is a small drain pipe to the left of the front door This drain allows the condensed water vapor which forms during the air conditioning cycle to escape to a suitable area of your selection On a very humid day there could be as much as 25 gallons of water formed Care should be taken in the spring to insure that this pipe is not plugged with dust that has collected during the winter since the water formed will overflow into the bottom of the heat pump Water Disposal Methods Water disposal methods vary from area to area however some consideration should be made to prevent the cooled discharge water from immediately coming in contact with the supply source Generally speaking returning water to a second well pond lake or stream is acceptable while returning water to the same well will usually cool the water so much that the heat pump will shut off on it s low pr
43. will soak back into the ground in less than 50 ft of travel If suitable care is taken to insure that the drain pipe runs downhill and the end of the pipe is protected by a bale of hay or spruce bows etc the end of the pipe will not freeze When snow comes it will usually cover the entire process much like a small spring The above information 15 intended to give the prospective purchaser some insight as to the general requirements for a successful applcation of the NORDIC heat pump 12 2003 Maritime Geothermal Ltd NORDIC Series Water Disposal Methods Open Loop Systems Supply Well Pitless Adaplor Pond 60 to 100 u Lake Stream Return Well Pitless Adaptor Water Table 60 to 100 f Submersible Pump 3 V Nordic lleat Punip Pitless Adaptor Water Table Tile Vield a ee Pump H L Submersible H L 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 The heat pump is well 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 thoroughly when it arrives Optimum Placement The NORDIC heat pump has an a
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