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Nordic ATWC Series Installation And Service Manual Download Page 74

PRELIMINARY: 24-Sep-2021 

Page   74 

002536MAN-00 

METRIC 

 

 

Outdoor Air 

Temperature 

Condensing 

Temperature 

Heat Rejected 

(W) 

Compressor 

Current (A) 

Input    

Power (W) 

ELT 

Evaporating 

Temperature 

Liquid Flow 

(L/s) 

LLT 

Delta T 

Cooling             

(W) 

COP

C

 

 

10°C 

 

 

 

 

12°C  

 

 

0.63

 

 

 

 

 

 

16°C 

 

 

 

 

 

 

 

 

 

 

21°C 

 

 

 

 

 

 

 

 

 

 

27°C 

 

 

 

 

 

 

 

 

 

 

32°C 

 

 

 

 

 

 

 

 

 

 

38°C 

 

 

 

 

 

 

 

 

 

 

43°C 

 

 

 

 

 

 

 

 

 

 

49°C 

 

 

 

 

 

 

 

 

 

EER 

 
 
 
 
 
 
 
 

Performance Tables    

ATWC-45-HAC-C-1D-*    

R410a/R134a, 60 Hz

                

 

 

OUTDOOR

 

ELECTRICAL

 

INDOOR 

 

Outdoor Air 

Temperature 

MODE 

Evaporating 

Temperature 

Heat Absorbed    

(Btu/hr) 

Compressor 

Current (A) 

Input    

Power (W) 

ELT 

Condensing 

Temperature 

Liquid Flow 

(gpm) 

LLT 

Delta T 

Heating             

(Btu/hr) 

COP

H

 

0°F 

Cascade 

 

 

 

 

 

 

10

 

120°F   

 

 

 

 

10°F 

Cascade 

 

 

 

 

 

 

 

 

 

20°F 

Cascade 

 

 

 

 

 

 

 

 

 

30°F 

Cascade 

 

 

 

 

 

 

 

 

 

40°F 

Cascade 

 

 

 

 

 

 

 

 

 

50°F 

Warm Weather 

 

 

 

 

 

 

 

 

 

60°F 

Warm Weather 

 

 

 

 

 

 

 

 

 

70°F 

Warm Weather 

 

 

 

 

 

 

 

 

 

0°F 

Cascade 

 

 

 

 

 

 

10

 

 

 

 

10°F 

Cascade 

 

 

 

 

 

 

 

 

 

20°F 

Cascade 

 

 

 

 

 

 

 

 

 

30°F 

Cascade 

 

 

 

 

 

 

 

 

 

40°F 

Cascade 

 

 

 

 

 

 

 

 

 

50°F 

Warm Weather 

 

 

 

 

 

 

 

 

 

60°F 

Warm Weather 

 

 

 

 

 

 

 

 

 

70°F 

Warm Weather 

 

 

 

 

 

 

 

 

 

0°F 

Cascade 

- 

- 

- 

- 

- 

- 

10

 

160°F  

 

LLT is limited to 145°F at                    

these outdoor temperatures 

10°F 

Cascade 

- 

- 

- 

- 

- 

- 

20°F 

Cascade 

 

 

 

 

 

 

 

 

 

30°F 

Cascade 

 

 

 

 

 

 

 

 

 

40°F 

Cascade 

 

 

 

 

 

 

 

 

 

50°F 

Warm Weather 

 

 

 

 

 

 

 

 

 

60°F 

Warm Weather 

 

 

 

 

 

 

 

 

 

70°F 

Warm Weather 

 

 

 

 

 

 

 

 

 

140°F   

 

HEATING 

 

 

Outdoor Air 

Temperature 

Condensing 

Temperature 

Heat Rejected 

(Btu/hr) 

Compressor 

Current (A) 

Input    

Power (W) 

ELT 

Evaporating 

Temperature 

Liquid Flow 

(gpm) 

LLT 

Delta T 

Cooling             

(Btu/hr) 

COP

C

 

 

50°F 

 

 

 

 

54°F  

 

 

10

 

 

 

 

 

 

60°F 

 

 

 

 

 

 

 

 

 

 

70°F 

 

 

 

 

 

 

 

 

 

 

80°F 

 

 

 

 

 

 

 

 

 

 

90°F 

 

 

 

 

 

 

 

 

 

 

100°F 

 

 

 

 

 

 

 

 

 

 

110°F 

 

 

 

 

 

 

 

 

 

 

120°F 

 

 

 

 

 

 

 

 

 

EER 

 
 
 
 
 
 
 
 

COOLING 

 

HEATING  

(M

ETRIC)

 

 

 

OUTDOOR

 

ELECTRICAL

 

INDOOR 

 

Outdoor Air 

Temperature 

MODE 

Evaporating 

Temperature 

Heat Absorbed    

(W) 

Compressor 

Current (A) 

Input    

Power (W) 

ELT 

Condensing 

Temperature 

Liquid Flow 

(L/s) 

LLT 

Delta T 

Heating             

(W) 

COP

H

 

-18°C 

Cascade 

 

 

 

 

 

 

0.63

 

49°C   

 

 

 

 

-12°C 

Cascade 

 

 

 

 

 

 

 

 

 

-7°C 

Cascade 

 

 

 

 

 

 

 

 

 

-1°C 

Cascade 

 

 

 

 

 

 

 

 

 

4°C 

Cascade 

 

 

 

 

 

 

 

 

 

10°C 

Warm Weather 

 

 

 

 

 

 

 

 

 

16°C 

Warm Weather 

 

 

 

 

 

 

 

 

 

21°C 

Warm Weather 

 

 

 

 

 

 

 

 

 

-18°C 

Cascade 

 

 

 

 

 

 

0.63

 

 

 

 

-12°C 

Cascade 

 

 

 

 

 

 

 

 

 

-7°C 

Cascade 

 

 

 

 

 

 

 

 

 

-1°C 

Cascade 

 

 

 

 

 

 

 

 

 

4°C 

Cascade 

 

 

 

 

 

 

 

 

 

10°C 

Warm Weather 

 

 

 

 

 

 

 

 

 

16°C 

Warm Weather 

 

 

 

 

 

 

 

 

 

21°C 

Warm Weather 

 

 

 

 

 

 

 

 

 

-18°C 

Cascade 

- 

- 

- 

- 

- 

- 

0.63

 

71°C  

 

LLT is limited to 63°C at                    

these outdoor temperatures 

-12°C 

Cascade 

- 

- 

- 

- 

- 

- 

-7°C 

Cascade 

 

 

 

 

 

 

 

 

 

-1°C 

Cascade 

 

 

 

 

 

 

 

 

 

4°C 

Cascade 

 

 

 

 

 

 

 

 

 

10°C 

Warm Weather 

 

 

 

 

 

 

 

 

 

16°C 

Warm Weather 

 

 

 

 

 

 

 

 

 

21°C 

Warm Weather 

 

 

 

 

 

 

 

 

 

60°C   

 

COOLING 

 

Summary of Contents for ATWC Series

Page 1: ...itcodiac NB E4Z 6H4 506 756 8135 ATWC Series High Temperature Air to Water Heat Pump R134a with Switchable R410a Cascade Mode Model Sizes 45 100 Space Heating or Dedicated Domestic Hot Water Options i...

Page 2: ...shock can cause serious personal injury or death WARNING Heat pump systems contain refrigerant under high pressure and as such can be hazardous to work on Only qualified service personnel should insta...

Page 3: ...2 6 7 D P D 00 Maritime Geothermal Ltd has a continuous improvement policy and reserves the right to modify specification data at any time without prior notice APPLICATION TABLE FIRMWARE AND PC APP F...

Page 4: ...utdoor Unit Connections 29 Oil Traps 29 Filter Dryer 29 Pipe Insulation 30 Silver Soldering Line Sets 30 Pressure Testing 30 Vacuuming the System 30 Charging the System 30 002544CDG Typical ATWC Line...

Page 5: ...riptions Top 99 Table A2 Control Board Connector Descriptions Left Side 99 Table A3 Control Board Connector Descriptions Bottom 100 Table A4 Control Board Connector Descriptions Right Side 101 002543C...

Page 6: ...ard which has many advanced features like laptop connectivity via the free PC App software data logging graphing and real time readout from electronic temperature pressure sensors Unlike many other NO...

Page 7: ...always chilled The heat pump has a built in routine to automatically maintain both the hot and cold tank temperatures In this system hot and cold water are available for use at any time In the setup d...

Page 8: ...F 60 C to 160 F 71 C These numbers can be found in the detailed perfor mance tables in the Model Specific Information section later in this manual This sizing will result in a good compromise be tween...

Page 9: ...NOT INDIVIDUAL PUMPS ZONE PIPING OTHER AIR HANDLERS DUCTING ZONE THERMOSTATS RELAYS OR ZONE CONTROLLER ZONE SUPPLY RETURN HEADERS 1 COPPER PIPE FITTINGS PIPE FITTINGS TO ZONES EXPANSION TANK 2 STYROF...

Page 10: ...pad This is not recommended in cold climates since ongoing care would be required to ensure re frozen condensate does not build up under unit 2 The unit can be mounted on angle brackets attached to th...

Page 11: ...PRELIMINARY 24 Sep 2021 Page 11 002536MAN 00 Average Maximum Snow Depth Canada 1979 1997 Source Natural Resources Canada...

Page 12: ...be powered using an external contactor actuated by the ICR terminal on the left side of the control board and the C 24V ground terminal TABLE 4 Outdoor Unit Power Supply Connections Line Description L...

Page 13: ...that has its own controller and trans former In general these types of devices will have their own electronic temperature controller Connection will be made to that device s E E terminals or similar D...

Page 14: ...controlled by the control board in the indoor unit and a temperature sensor must be read For ATWC ATW2 series this is done by MODBUS communications between the main control board in the indoor unit a...

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Page 19: ...ank Size Heat Pump Size Minimum Size gal L Recommended Size gal L 45 24 90 50 190 55 32 120 70 265 75 48 180 70 265 100 70 265 100 380 If a tank size is not available use the next size larger tank 65...

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Page 29: ...re connections After the line set is installed the tubing can be vacuumed through the Schrader charging port on the 3 way valve then the valve opened to let refrigerant contained in the indoor unit in...

Page 30: ...onto floors or walls during the heating season It can be slid onto the capped tubing without having to slice it down the side for the most part Ensure that any joints in in the line sets are accessibl...

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Page 32: ...ntrol the heat pump will turn the compressor s on and off and activate cooling mode when it is told to by 24VAC signals These are provided via external dry contacts most often from an aquastat or aq u...

Page 33: ...e setpoint will never be reached Summer Setback In locations where hydronic cooling is not required the heating system may be idle for several months in the summer In this case the heat pump may be pu...

Page 34: ...oor temperature rises and heating load falls the heating mode buffer tank temperature will be de creased and a higher seasonal efficiency will result Setpoint Control Method 2 Indoor Loop ICR Two Tank...

Page 35: ...l board PC APP Tools Configuration LCD Interface Configuration Cooling mode is selected by making a dry contact connec tion between the R and O terminals on the terminal strip in the electrical box Th...

Page 36: ...Type 7 or Type 3 NTC thermistors along with 10K 1 or better resistors must be connected to the control board Connect the Hot Tank sensor to the AI_5 input and the Cold Tank sensor to the AI_4 input a...

Page 37: ...ed File Open Opens a saved page arrangement File Save Saves the current page arrangement under the current name File Exit Exits the PC Application Windows Menu This menu is used to arrange windows pag...

Page 38: ...oads the defrost log Number of defrosts since history was last erased Defrost history log Compressor status Real time display of defrost state Export the history as tab delimited Selectable temperatur...

Page 39: ...l occur When the compressor starts low pressure alarm will be ignored for the number of seconds that Low Pressure Ignore is set to after which the low pressure alarm will be re enabled This allows a d...

Page 40: ...m that occurs while the PC APP is connected to the control board will appear here The alarm type and a time stamp will be shown The alarms list will be erased when the PC APP is disconnected from the...

Page 41: ...board then turn the power back on again If the fault persists then there is most likely a hardware problem and the sensor control board or LCD display board will need to be replaced IMPORTANT NOTE If...

Page 42: ...r individu al settings and values Click on the EDIT button to modify the blue boxes button will now say SAVE For each channel a name may be selected up to 16 characters and the multiplier and Offset v...

Page 43: ...e vs outdoor temperature Indoor IN OUT temperatures and delta T Discharge pressure vs tank temperature Hot and cold tank temperatures for systems using HTS CTS method with 2 tanks All analog input cha...

Page 44: ...e click to enable Firmware update see Appendix Green when pa rameters have been updated red during the update Firmware revision can also be seen on the LCD during power up Model Configu ration section...

Page 45: ...educe Time is the number of hours after which the alarm count is reduced by 1 if no other alarm occurred within the timeframe The number of minutes before the unit can start again after a normal shutd...

Page 46: ...reset will default the system to a two stage ATW Series Size 65 with Signals as the control source Calibrations alarm delays analog configurations compressor statistics and Setpoint Control values wil...

Page 47: ...ested to leave the of LOGS at 25 until it is shown that the start date selected is suitable Loads the of LOGS beginning from the earliest date Loads the of LOGS beginning from the se lected date Erase...

Page 48: ...change a parameter value type in the new value and press ENTER Clicking on menu item Tools Parameters will display this warning Click on YES to open the parameters page Type in the new value and press...

Page 49: ...ption Setpoint Control only if using Setpoint Control Setpoints Heating Stage 1 Setpoint Stage 1 stops when water temperature rises to this point Stage 1 Delta Stage 1 starts when water temperature dr...

Page 50: ...ling HTS CTS Use external temperature sensors OD Fan Reduction Reduction Outdoor fan speed reduction in Number of Tanks only if using Setpoint control with HTS CTS One Tank One tank for heating coolin...

Page 51: ...ine right pin B Communications line middle pin C Ground connection left pin If connecting multiple units to one RS 485 connection point connect the signal cable from the master building controller to...

Page 52: ...on AI19 Present Value R134a active EEV position open Outside Ambient AI20 Present Value degF degC Outdoor Ambient temperature O_IN AI21 Present Value degF degC N A O_OUT AI22 Present Value degF degC N...

Page 53: ...2 5 R410a low pressure cooling mode alarm suction pressure 3 9 R410a high pressure heating mode alarm discharge pressure 4 17 R410a high pressure cooling mode alarm discharge pressure 5 33 R410a loss...

Page 54: ...AI21 N A O_OUT Analog Input AI22 N A I_IN Analog Input AI23 Indoor IN temperature sensor faulty or disconnected I_OUT Analog Input AI24 Name ID BIT DECIMAL VALUE Description Board Faults AV8 Bit descr...

Page 55: ...are fully open and there are no restrictions in the piping from the heat pump to the indoor loop and that full flow is available to the heat pump 2 Verify that the entire system has been flooded and a...

Page 56: ...ture and in warm weather only circuit 2 R134a will be active 3 Monitor the unit via the PC APP or LCD while the unit runs and record the following after 10 minutes of run time 1 R410a suction discharg...

Page 57: ...curely fastened Circuit breaker or fuse size and wire gauge for heat pump A Ga Circulator pump voltages V V V Low voltage connections are correct and securely fastened STARTUP DATA Preparation Power b...

Page 58: ...ump problem is suspected Check for alarms and faults only necessary if alarms not reported through a BACnet system Rectify problem if alarms found See Troubleshooting chap ter Brazed Plate Refrigerant...

Page 59: ...V of the aquastat but aq uastat has no display Replace aquastat No display on aquastat Signals control method only The following steps are for troubleshooting the heat pump If the problem is with the...

Page 60: ...no call for the com pressor to be on i e welded contactor or when there is a call for the compressor to be on but there is no compressor current draw i e manual high pressure control is open or contac...

Page 61: ...ff the power disconnect ing and reconnecting the cable be tween the LCD Display board and the Control Board and then turning the power back on again If this does not work then either the LDC Display b...

Page 62: ...res from compressor Ohmmeter shows infinite resistance between any two terminals Note Be sure compressor overload has had a chance to reset If compressor is hot this may take several hours Replace the...

Page 63: ...emperature difference then it is plugged Also causes low suc tion pressure Replace filter dryer Unit is overcharged High subcooling low Indoor Loop delta T Remove 1 2 lb of refrigerant at a time and v...

Page 64: ...ssible Cause Verification Recommended Action Outdoor unit s EEV3 or EEV4 stuck open Manually adjusting the outdoor EEV does not affect the superheat or the suction pressure Low superheat and low disch...

Page 65: ...to EEV troubleshooting sec tion TS1 or TS2 temperature sensor not reading proper ly If the sensor is reading low it will cause the superheat to appear high which causes the EEV to con tinually close V...

Page 66: ...is does not correct the problem re place the control board Fan PWM Signal connec tions Use manual mode of PC APP to set the outdoor fan to 50 Using a multi meter set to VDC measure PWM to ground in th...

Page 67: ...pressure i e the system will not equalize since EEV s are closed when there is no demand If the system does equalize it is likely that the EEV is not working and is partially open Manually set the EE...

Page 68: ...system Always ensure nitrogen is flowing through the system at the lowest flow rate that can be felt at the discharge dur ing any brazing procedures to prevent soot buildup inside the pipes It is reco...

Page 69: ...revent soot buildup inside the pipes 4 Vacuum the unit as per above procedure 5 If there was a compressor burnout a Charge the unit with new refrigerant and operate it for continuously for 2 hours Pum...

Page 70: ...them as well 8 Carefully remove the new control board from the static bag it was shipped in Place any cut off standoffs from the old board into the same locations on the new board 9 Align the control...

Page 71: ...e display board Ensure the connector is properly aligned and that no pins are showing 9 Place the display board in position and align the four standoffs into the four holes of the board 10 Push on eac...

Page 72: ...WC 65 14 0 88 ATWC 75 16 1 0 ATWC 100 21 1 3 Note for circ pump sizing these flow rates may be greater than required for boilers of a similar heating capacity ATWC 80 17 1 1 Table 25 Shipping Informat...

Page 73: ...69 12 0 76 13 0 82 14 0 88 15 0 95 16 1 01 ATWC 65 7 0 44 8 0 50 9 0 57 10 0 63 11 0 69 12 0 76 13 0 82 14 0 88 15 0 95 16 1 01 ATWC 80 8 0 50 9 0 57 10 0 63 11 0 69 12 0 76 13 0 82 14 0 88 15 0 95 16...

Page 74: ...e outdoor temperatures 10 F Cascade 20 F Cascade 30 F Cascade 40 F Cascade 50 F Warm Weather 60 F Warm Weather 70 F Warm Weather 140 F HEATING Outdoor Air Temperature Condensing Temperature Heat Rejec...

Page 75: ...e outdoor temperatures 10 F Cascade 20 F Cascade 30 F Cascade 40 F Cascade 50 F Warm Weather 60 F Warm Weather 70 F Warm Weather 140 F HEATING Outdoor Air Temperature Condensing Temperature Heat Rejec...

Page 76: ...e outdoor temperatures 10 F Cascade 20 F Cascade 30 F Cascade 40 F Cascade 50 F Warm Weather 60 F Warm Weather 70 F Warm Weather 140 F HEATING Outdoor Air Temperature Condensing Temperature Heat Rejec...

Page 77: ...se outdoor temperatures 10 F Cascade 20 F Cascade 30 F Cascade 40 F Cascade 50 F Warm Weather 60 F Warm Weather 70 F Warm Weather 140 F HEATING Outdoor Air Temperature Condensing Temperature Heat Reje...

Page 78: ...se outdoor temperatures 10 F Cascade 20 F Cascade 30 F Cascade 40 F Cascade 50 F Warm Weather 60 F Warm Weather 70 F Warm Weather 140 F HEATING Outdoor Air Temperature Condensing Temperature Heat Reje...

Page 79: ...ese outdoor temperatures 10 F Cascade 20 F Cascade 30 F Cascade 40 F Cascade 50 F Warm Weather 60 F Warm Weather 70 F Warm Weather 140 F HEATING Outdoor Air Temperature Condensing Temperature Heat Rej...

Page 80: ...48 4 0 3 0 19 0 20 5 25 10 4 6 220 1 50 187 253 16 0 87 17 3 122 4 0 3 0 40 5 44 8 60 6 2 7 380 3 50 342 418 6 0 46 5 8 48 4 0 3 0 19 0 20 5 25 10 4 ATWC 65 1 230 1 60 187 253 19 6 130 25 3 146 4 0 3...

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Page 92: ...PRELIMINARY 24 Sep 2021 Page 92 002536MAN 00 Dimensions ATWC 45 55...

Page 93: ...PRELIMINARY 24 Sep 2021 Page 93 002536MAN 00 Dimensions ATWC 45 55...

Page 94: ...PRELIMINARY 24 Sep 2021 Page 94 002536MAN 00 Dimensions ATWC 65...

Page 95: ...PRELIMINARY 24 Sep 2021 Page 95 002536MAN 00 Dimensions ATWC 65...

Page 96: ...PRELIMINARY 24 Sep 2021 Page 96 002536MAN 00 Dimensions ATWC 75 80 100...

Page 97: ...PRELIMINARY 24 Sep 2021 Page 97 002536MAN 00 Dimensions ATWC 75 80 100...

Page 98: ...1 Sensor Connector Temperature Connectors INDOOR OUTDOOR IN OUT IN OUT Short Circuit Protectors 24VAC Power Indicator USB Connector 5VCD 12VDC 24VDC power indicators Fault Indicator BACnet MS TP Conne...

Page 99: ...Loop OUT Mounted to pipe inside unit O_IN Outdoor Loop IN Unused O_OUT Outdoor Loop OUT Unused TABLE A2 Control Board Connector Descriptions Left Side Name Description PWM_IN Signal for PWM IN Unused...

Page 100: ...3 7 10k hot tank temperature sensor for HTS CTS Setpoint Control AI_4 Analog In Channel 4 Optional type 3 7 10k cold tank temperature sensor for HTS CTS Setpoint Control AI_3 Analog In Channel 3 0 to...

Page 101: ...circuit alarm used with C 1 Stage 1 alarm Dry contact to indicate R410a circuit alarm used with C C Alarm Common Used with 2 and 1 above AR Airflow Reductions Unused 24VAC Power 24VAC to indoor flow s...

Page 102: ...k on Step 1 to install the USB driver clicking allow or yes as required If the USB stick drive is not available the same file can be downloaded from the web page 1 Go to www nordicghp com Download Sof...

Page 103: ...ble click on the SOFTWARE folder to show its contents Double click on Step 2 and follow the prompts clicking allow or yes as required If you get a warning that NET framework is required go back and do...

Page 104: ...le PIC32UBL exe the programmer USB Bootloader Instructions pdf these instructions Note that on most computers the file extensions exe pdf will be hidden 3 Connect a USB printer cable between computer...

Page 105: ...programmer disconnects itself The messages should read as follows NOTE Updating the firmware does not affect the configu ration settings 12 Click on Load Hex File Select the MGL_GEN2_V400 production...

Page 106: ...upplied anti vibration grommets when specified for use Corrosion damage due to corrosive ambient environment Failure due to excessive cycling caused by improper mechanical setup or improperly programm...

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