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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 satisfied.
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