lp-441 Rev. 002 Rel. 008 Date 8.23.18
27
Part 7 - Wiring
To avoid electrical shock, turn off all power to the heater prior
to opening an electrical box within the unit. Ensure the power
remains off while any wiring connections are being made. Failure
to follow these instructions could result in component or product
failure, serious injury, or death. Such product failure IS NOT
covered by warranty.
Jumping out control circuits or components WILL VOID product
warranty and can result in property damage, personal injury, or
death.
A. Line Voltage Input
The heater is equipped with a three prong power cord. The heater is
limited to a maximum of 8 amps at 120 volts in use.
1. This water heater must be properly grounded. Ensure the electrical
receptacle is properly grounded. Do not remove the grounding
prong from the water heater plug.
2. Do not attach the ground wire to either the gas or water piping.
Figure 17 - Proper Grounding
B. Line Voltage Condensate Input
The heater has the capability of supplying power to a condensate
pump. The connection is 115 VAC + 10% / - 15% at a max of 2 amps.
Power is supplied to the pump only when the heater is connected to
power, and the power switch is in the on position.
C. Low Voltage Outdoor Sensor Input
The heater has the capability of an outdoor reset. Connecting an
outdoor sensor allows the heater to operate at optimum efficiency.
HTP offers an outdoor sensor, p/n 7250P-319.
The outdoor sensor must be a 12K NTC sensor. Use a minimum 22
AWG wire for runs of 100 feet or less and minimum 18 AWG wire for
runs up to 150 feet. Instructions are included with the outdoor sensor
to correctly mount the sensor on the exterior surface of the building.
It is preferable to mount the sensor on the north side in an area that
will not be affected by direct sunlight but will be exposed to varying
weather conditions. Connect the outdoor sensor to terminals marked
“Outdoor”.
It is of extreme importance that this unit be properly grounded. It
is very important that the building system ground is inspected by
a qualified electrician prior to making this connection. Electrical
power must only be turned on when the heater is completely filled
with cold water. Failure to follow these instructions could result in
component or product failure, serious injury, or death.
Figure 18 - Low Voltage Wiring
Label all wires prior to disconnecting them when servicing the
heater. Wiring errors can cause improper and dangerous operation.
Failure to follow these instructions may result in property damage or
personal injury.
3. The wiring diagrams in this manual are to be used for reference
purposes only. Refer to these diagrams and the wiring diagrams of
any external controls used with the installation when wiring the
water heater. Read, understand, and follow all wiring instructions
supplied with the controls.
4. Do not disconnect the power supply when the water heater is in
normal operation.
NOTE:
For additional electrical protection, the use of a whole house
surge protector is recommended. Damage caused by power surges
IS NOT covered by the warranty.
NOTE:
If the water heater display does not turn on, first check the
plug. Then check the electrical panel circuit breaker and reset if
necessary. If the circuit breaker trips again, do not reset. Disconnect
the plug and have a qualified technician diagnose the problem.
