HTP 7100P-220 User manual

LP-420 REV. 2.14.20
SOLAR KIT INSTALLATION INSTRUCTIONS
FOR VERSA HYDRO COMBINATION APPLIANCES
(Part # 7100P-220)
APPLICABLE TO VERSA HYDRO SOLAR MODELS MANUFACTURED AFTER 9/25/2012
STOP! Follow these instructions or warranty will be void!
This installation shall be done by a qualified service agency in accordance with these instructions, all applicable codes, and
requirements of the authority having jurisdiction. Failure to follow these instructions could result in substantial property damage, severe
personal injury, or death.
INCLUDED IN KIT
The installation kit includes the following:
QUANTITY
DESCRIPTION
1
PANEL SENSOR W/ BLACK UV RATED CONNECTION WIRE
1
TANK SENSOR W/ GREY CONNECTION WIRE
1
FLOW METER
1
INSTALLATION INSTRUCTIONS
Table 1
TOOLS REQUIRED (NOT INCLUDED)
•See LP-204 (Versa Hydro Solar Supplement) for a list of tools and materials required in solar installations
STEP 1: INSTALLATION OF THE SENSORS
1. Remove cover from tank sensor opening to expose the stud (Tt). Remove the existing clip and nut. See Figure 1.
2. Attach the tank sensor (grey wire) provided in this kit to the stud using the existing clip and nut. See Figure 2.
3. Use a drill with ¼” bit to drill a hole in the center of the tank sensor cover.
4. Feed grey tank sensor wire through the hole in the center of the tank sensor cover.
5. Reinstall tank sensor cover. See Figure 3.
Figure 1 - Tank Sensor Mounting Stud Figure 2 – Installed Tank Sensor Figure 3 – Wire Fed through Sensor Cover
6. Feed wires from tank sensor through the knockout in the lower left of the electronics cabinet. See Figure 4.
7. Feed the tank sensor wires through the mounting clip. See Figure 5.
8. Attach tank sensor wires to the four position terminal block on the electronics panel at the Tt terminals. See Figure 6.
NOTE: Reverse polarity is not a concern with the sensor wires.

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LP-420 REV. 2.14.20
Figure 4 – Wires Fed through Knockout Figure 5- Wire Fed through Clip Figure 6 – Wiring Sensor to Terminal Block
9. Connect the panel sensor (Tp – black UV rated wires) at the solar collector. See Versa Hydro Solar Supplement, LP-204, for
attachment instructions and suggested wire types.
10. Feed the solar connector sensor wires through a knockout on the right side of the electronics cabinet.
11. Connect the panel sensor wires to the SOLAR SENSOR terminals on the customer connection board.
NHX Models ONLY:
1. Connect the NHX pump power leads to the NHX PUMP (J3) terminals on the customer connection board. See Figure 7.
2. Connect the wires from the top sensor of the solar storage tank to the Ts connections on the Terminal Block of the NHX
appliance. See Figure 6.
Figure 7 – Customer Connection Board

3
LP-420 REV. 2.14.20
STEP 2: INSTALLATION OF THE FLOW METER
1. Run the flow meter wire through the same knockout on the left side of the electrical cabinet as the tank sensor wire.
2. Connect the flow meter wire into Terminal X3 on the control
board. See Figure 8.
3. Use the length of wire from the connected flow switch to
determine flow meter installation location.
NOTE: DO NOT install the flow meter more than one (1) foot
away from the Versa Hydro.
4. After determining installation location, disconnect the flow meter
wire from the customer connection board and install the flow
meter as described in the included instruction sheet on the
collector supply line (pipe running from the Versa Hydro to the
solar collector).
5. After the flow meter is properly installed, feed the flow meter wire
through the knockout and reconnect to the customer connection
board.
6. See Figure 9 for an example of completed solar kit wiring.
The flow meter cannot support weight. It is extremely important to
properly support the flow meter.
Failure to do so could result in
substantial property damage, severe personal injury, or death.
Figure 9 – Completed Solar Kit Wiring
Figure 8 – Flow Meter Plugged into Control Board

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LP-420 REV. 2.14.20
STEP 3: PIPING RECOMMENDATIONS
FIGURE NOTES:
1. Minimum pipe size should match connection size on appliance. If you require greater flow, upsize pipe accordingly.
2. A thermal expansion tank suitable for potable water must be sized and installed within the piping system between the check valve and cold
water inlet of the appliance.
3. Gas line must be rated to the maximum capacity of the unit. Unit must have 10 feet of pipe after gas regulator.
4. All circulators shall have an integral flow check.
5. An ASSE 1017 mixing valve is required per SRCC OG-300.
6. The flow meter must be properly supported and installed no more than one (1) foot from the Versa Hydro.
NOTE: This drawing is meant to show system piping concept only. The installer is responsible for all equipment and detailing required by
local codes.

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LP-420 REV. 2.14.20
FIGURE NOTES:
1. This drawing is meant to show system piping concept only. The installer is responsible for all equipment and detailing by local codes.
2. Antifreeze, non-potable HTF shall be used for the solar heat exchanger circuit only. Never introduce antifreeze solution to any connection
other than the solar loop.
3. If there is a check valve on the cold water feed line, a thermal expansion tank suitable for potable water must be sized and installed within
this piping system between the check valve and cold water inlet of the solar water heater.
4. An ASSE 1017 mixing valve is required per SRCC OG-300.
5. A minimum of 12 diameters of straight pipe must be installed upstream of all circulators.
6. Make sure tank is fully purged of air before power is turned on to the backup heat source.
7. Circulators shown in the above hydronic piping should have an integral flow check or alternately use a stock pump with an external spring
type check valve. (Due to extreme temperatures, circulators with integral flow checks are not to be used in solar systems. If circulator comes
equipped with an integral flow check, remove it.)
8. Non-vertical drain back solar system piping should pitch ¼” per foot to facilitate draining.
9. No check valves are allowed within the solar loop.
10. Solar pumps must be installed 3’ below the drain back tank.
11. The drain back tank must be properly supported.
12. The flow meter must be properly supported and installed no more than one (1) foot from the Versa Hydro.

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LP-420 REV. 2.14.20
FIGURE NOTES:
1. Minimum pipe size should match connection size on appliance. If you require greater flow, upsize pipe accordingly.
2. A thermal expansion tank suitable for potable water must be sized and installed within the piping system between the check valve and cold
water inlet of the appliance.
3. Gas line must be rated to the maximum capacity of the unit. Unit must have 10 feet of pipe after gas regulator.
4. All circulators shall have an integral flow check.
5. An ASSE 1017 mixing valve is required per SRCC OG-300.
6. The flow meter must be properly supported and installed no more than one (1) foot from the Versa Hydro.
NOTE: This drawing is meant to show system piping concept only. The installer is responsible for all equipment and detailing required by
local codes.

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LP-420 REV. 2.14.20
FIGURE NOTES:
1. This drawing is meant to show system piping concept only. The installer is responsible for all equipment and detailing by local codes.
2. Antifreeze, non-potable HTF shall be used for the solar heat exchanger circuit only. Never introduce antifreeze solution to any connection
other than the solar loop.
3. If there is a check valve on the cold water feed line, a thermal expansion tank suitable for potable water must be sized and installed within
this piping system between the check valve and cold water inlet of the solar water heater.
4. An ASSE 1017 mixing valve is required per SRCC OG-300.
5. A minimum of 12 diameters of straight pipe must be installed upstream of all circulators.
6. Make sure tank is fully purged of air before power is turned on to the backup heat source.
7. Circulators shown in the above hydronic piping should have an integral flow check or alternately use a stock pump with an external spring
type check valve. (Due to extreme temperatures, circulators with integral flow checks are not to be used in solar systems. If circulator comes
equipped with an integral flow check, remove it.)
8. Non-vertical drain back solar system piping should pitch ¼” per foot to facilitate draining.
9. No check valves are allowed within the solar loop.
10. Solar pumps must be installed 3’ below the drain back tank.
11. The drain back tank must be properly supported.
12. The flow meter must be properly supported and installed no more than one (1) foot from the Versa Hydro.
STEP 4: PROGRAMMING THE SYSTEM
NOTE: Programming the control is not possible when the unit is firing. Make sure any input (such as the thermostat) is turned off, so
the water heater will remain idle to allow programming.
SCREEN
DESCRIPTION
ENTER MENU CODE
000
To access the system setting program, press and hold the ENTER Key for 4 seconds, until the display
shows the screen at left.
ENTER MENU CODE
925
Using the arrow keys on the display, log in your System Menu Access Code “925”. To confirm code,
press ENTER to access system setting program navigation menu.
Table 2 – System Settings
Once the System Menu Access Code is confirmed, the user can set System Parameters. Use the arrow keys on the display to
navigate through the different program settings. To change an appliance setting, press ENTER. Increase system settings by pressing
▲and decrease by pressing ▼on the display.
Listed below are the system settings that can be programmed into the control.

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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 95oF
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 140oFSOLAR
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 174oF 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