8
LP-420 REV. 2.14.20
SCREEN
DESCRIPTION
Function 52
Solar Mode
SOLAR MODE
ON 52
When turned ON, this parameter enables solar function of the control. Default: OFF.
Function 41
Solar DT Off
SOLAR DT OFF
5
o
F 41
Determines when the solar pump turns off based on the temperature differential between the panel
sensor and tank sensor. Factory default 5
o
F. (Range 1
o
F to 40
o
F).
Function 42
Solar DT On
SOLAR DT ON
9
o
F 42
Determines when the solar pump turns on based on the temperature differential between the panel
sensor and tank sensor. Factory default 9
o
F. (Range 95
o
F to 185
o
F).
Function 43
Startup Time Solar
STARTUP TIME SOLAR
1 Minute 43
In drain back systems, the pump turns on for a period of time to charge the system. Factory default 1
minute. (Range 95
o
F to 185
o
F).
Function 44
Anti Cycle Solar
ANTI CYCLE SOLAR
5 Minutes 44
Sets the solar pump delay from the time Solar DT On is satisfied. Factory default 5 minutes. (Range 95
o
F
to 185
o
F).
Function 45
NHX Solar
NHX SOLAR
OFF 45
When turned ON, selects the large storage tank / NHX configuration. Factory default OFF. (When set to
ON, Functions 46 and 47 apply.)
Function 46
NHX DT Off
NHX DT OFF
1
o
F 46
Sets the differential between the storage tank sensor and lower tank sensor at which the solar circulator
pump turns off. Factory default 0
o
F. (Range 1
o
F to 40
o
F).
Function 47
NHX DT On
NHX DT ON
ON 47
Sets the differential between the storage tank sensor and lower tank sensor at which the solar circulator
pump turns on. Factory default 0
o
F. (Range 1
o
F to 40
o
F).
Function 50
Solar Pump Min
SOLAR PUMP MIN
3.0 50
Determines the voltage to the solar pump at its lowest speed. Factory default 3.0 Volts. (Range 1 to 10
Volts).
Function 51
Solar Pump Max
SOLAR PUMP MAX
10.0 51
Determines the voltage to the solar pump at its highest speed. Factory default 10.0 Volts. (Range 1 to 10
Volts).
Table 3 – Solar System Parameters
STEP 5: SOLAR STATUS MENU
The controller also has the ability to review solar system status. To access solar status screens, press
twice. Once the first value is
displayed, press the
▲
or
▼
keys to access additional information. At any point you may press
RESET
to exit the solar status screens.
SCREEN
DESCRIPTION
0% SOLAR SOLAR
0% FUEL
This screen displays the actual percentage of energy obtained from both the solar and gas-fired burner of
the Versa-Hydro combination appliance.
Press the
▼
key once.
PANEL 140
o
F SOLAR
TANK 75
o
F
The top line of this screen displays the temperature at the solar collector (Tp), and the bottom line
displays the temperature of the solar tank (Tt).
Press the
▼
key once.
0.0 GPM SOLAR
12 BTU PUMP 100%
The top line of this screen displays the amount of flow measured at the flow meter. The bottom line
displays the amount of BTU gain per day based on (Tp-Tf) and flow. This calculation resets at midnight
each day. Pump % refers to the current percentage of the maximum solar pump speed.
Press the
▼
key once.
SUPPLY 174
o
F SOLAR
RETURN 72
o
F PUMP ON
The top line displays the temperature at the tank outlet. The bottom line displays the temperature at the
flow meter (Tf). Pump will display ON when solar pump is running, OFF when the pump is off.
Table 4 – Solar Status Menu
Fault Conditions:
Fault Description
Error Type
Display Message
1) Pump Boost Never Achieves Flow
Solar Blocking
No Solar Flow
2) Panel Temperature Sensor Working Improperly or Panel Temperature is Higher
than Parameter
•
Can Happen During No Operation
•
Use Pump Menu to Manually Run the Solar Pump and Cool the Solar Loop
•
If Panel Error Remains, Panel Sensor May Need to be Replaced
Solar Blocking
Panel Sensor Fail
3) Tank Temperature Sensor Working Improperly
Solar Blocking
Tank Sol Sensor Fail
4) Solar Storage Tank Sensor Working Improperly
Solar Blocking
Storage Sensor Fail
5) Upper Tank Sensor Reached High Limit
Solar Blocking
High Temp Reached
Table 5 – Fault Conditions
