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Model LAHP48 Air to Water Heat Pump — Installation, Operation & Maintenance Manual
LAHP Controller
The LAHP controller allows the adjustment of heating & cooling setpoints, differentials, and defrosting parameters.
The following chart depicts the factory default values for the most commonly adjusted parameters.
Certain read only parameters are available to evaluate performance or troubleshoot faults. These are accessed through the same
parameter menu and are listed below.
DISPLAY DESCRIPTION MIN MAX UOM DEFAULT MEANING PASSWORD
A01 Low Temp Alarm A07 A04 °F 32.0 Water temperature below which the Low Temp alarm A1 will activate 22
A02 Alarm differential 0.3 122.0 °F 4.0 Alarm A1 turns off at A01 + A02 22
A04 Aux heater setpoint A01 r16 °F 34.0 Water temperature below which the pump and electric heater, if present, engage. 22
A05 Differential for aux heater 0.3 50.0 °F 4.0 Pump and heater turns off at A04+A05 22
A07 Antifreeze alarm set point limit -40.0 176.0 °F 32.0 Minimum temperature that A01 can be set to 66
A08 Auxiliary heater set point in heating mode A01 r15 °F 90.0 Water temperature below which the electric heater, if present, engages in heating mode 22
A09 Auxiliary heater differential in heating mode 0.3 50.0 °F 5.0 Electric heater turns off at A08 + A09 in heating. 22
b00 Default display value 0 10 Flag 0 b00 = 0 Displays return water temperature b00 = 01 displays supply water temperature 22
b01 Probe B1 reading - - °F - Read only, real time return water temperature 00
b02 Probe B2 reading - - °F - Read only, real time supply water temperature 00
b03 Probe B3 reading - - °F - Read only, real time OS coil surface temperature 00
b04 Probe B4 reading - - Bar - Read only, real time OS coil refrigerant pressure 00
b08 Probe B8 reading - - °F - Read only, real time ambient air temperature 00
c10 Accumulated compressor hours - - hrs x 100 - Value x 100 is the accumulated compressor run time in hours 00
C15 Accumulated pump hours - - hrs x 100 - Value x 100 is the accumulated pump run time in hours 00
d01 Defrost cycle 0 1 Flag 1 Defrost feature enabled 22
d02 Defrost logic 0 2 Flag 2 Start on pressure, end on temperature 22
d03 Start defrosting pressure 0.0 d04 Bar 3.2 Suction pressure below which Defrost initiates (1 bar = 14.5 PSIG) 22
d04 End defrosting temperature 0.0 176.0 °F 45 End defrost temperature, coil surface 22
d06 Min. duration of a defrosting cycle 0 150 Second 60 Minimum defrost duration even if all conditions are satised. 22
d07 Max. duration of a defrosting cycle 1 150 Minute 7 Maximum allowable defrost duration. Will display dF1 error code if exceeded 22
d08 Delay between 2 defrost cycles 10 150 Minute 45 Minimum time betgween two successive defrost cycles even if conditions call for it 22
d16 Forced ventilation time at the end of the defrosting 0 360 Second 45 Duration of fan operation at full speed to clear water from coil 66
d17 Defrost with compressors OFF 0 80.0 °F 55.0 Temperature above which defrost occurs with fans only. 66
F02 Fan operating logic 0 2 Flag 02
0 = Fans on full speed whenever unit is on
1 = Fans on when compressor is running
2 = Fans modulating according to F03 through F10
66
F03 Min. voltage threshold for Triac 0 F04 % 10 Establishes low end of fan modulation signal (See Fig 3 & Fig 6) 66
F04 Max. voltage threshold for Triac F03 100 % 100 Establishes high end of fan modulation signal (See Fig 3 & Fig 6) 66
F05 Pressure value for min. speed Cooling 0.0 42.0 Bar 20.0 Discharge pressure, bar, below which fans remain on at minimum speed (1 Bar = 14.5 PSIG) (See Fig 3) 22
F06 Pressure differential for max. speed Cooling 0.0 42.0 Bar 6.0 Fans reach max speed at F05 + F06 (See Fig 3) 22
F07 Pressure differential for fan shut-down in Cooling mode 0.0 F5 Bar 2.0 Fans shut down at F05 - F07 (See Fig 3) 22
F08 Pressure value for min speed in Heating mode 0.0 42.0 Bar 10.0 Discharge pressure, bar, above which fans operate at minimum speed (See Fig 4) 22
F09 Pressure differential for max speed in Heating 0.0 F08 bar 5.5 Fans reach maximum speed at F08 - F09 (See Fig 4) 22
F10 Pressure differential for fan shut-down in Cooling mode 0 F08 Bar 1.0 Fans shut down at F08 + F10 (See Fig 4) 22
F11 Fan starting time 0 120 Second 15 Fans start at maximum speed and remain for this duration before modulating 22
r01 Cooling set point r13 r14 °F 47.0 Primary cooling setpoint (See Fig 5) 00
r02 Cooling differential 0.3 50.0 °F 8.0 Cooling differential/hysteresis 00
r03 Heating set point r15 r16 °F 120.0 Primary heating setpoint (See Fig 6) 00
r04 Heating differential 0.3 50.0 °F 8.0 Heating differential/hysteresis 00
r06 Compressor control logic 0 4 Flag 00
00 = Proportional control on return water temperature
02 = Proportional control on supply water temperature
66
r13 Min. Cooling set point -40.0 r14 °F 42 Minimum allowable cooling setpoint 22
r14 Max. Cooling set point r13 176.0 °F 65 Maximum allowable cooling setpoint 22
r15 Min. Heating set point -40 -40.0 °F 80.0 Minimum allowable Heating setpoint 22
r16 Max. Heating set point r15 176.0 °F 140.0 Maximum allowable Heating setpoint 22
r17 Cooling compensation constant -5.0 +5.0 °F 0.0 Slope of Outdoor reset curve, Deg water temp/Deg ambient temp. Cooling mode (See Fig 5) 22
r18 Maximum distance from the set point 0.3 20.0 °F 8.0 Maximum deviation from setpoint that can be achieved by outdoor reset (See Fig 5 & Fig 6) 22
r19 Start compensation temperature in cooling mode -40.0 176.0 °F 85.0 Ambient air temp above which Outdoor Reset is active in Cooling (See Fig 5) 22
r20 Start compensation temperature in heating mode -40.0 176.0 °F 30.0 Ambient air temp below which Outdoor Reset is active in Heating (See Fig 6) 22
r31 Heating compensation constant -5.0 +5.0 °F 0 Slope of Outdoor reset curve, Deg water temp/Deg ambient temp. Heating mode (See Fig 6) 22
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