Electrical Installation; Operation Procedure - HeatStar HSU100NGPALP Operating Instructions And Owner's Manual

10. Use thread joint compound that is approved for use with the gas
that will be used for the heater.
11. Pressure/leak test the gas supply line prior to installing the heater
per local/national code. After the heater is installed, pressure/leak
test with test pressures below ½ psi (3.48 kPa) to the appliance.
Damage will occur if the test pressure to the appliance is greater
than ½ psi (3.48 kPa). The gas valve on the appliance must be
off/closed during any pressure testing.

ELECTRICAL INSTALLATION

WARNING: Disconnect all electric power before installing or
servicing the heater.
Failure to disconnect all electric power before installing or
servicing could cause electric shock, injury, or death.
1. Installation of wiring must conform with local building codes,
or in the absence of local codes, with the National Electric Code
ANSI/NFPA 70 – Latest Edition. Unit must be electrically grounded
in conformance to this code. In Canada, wiring must comply with
CSA C22.1, Part 1, Electrical Code.
2. Two copies of the unit wiring diagram are provided with each
unit. One is located on the side access control compartment
panel and the other is in this manual (see Figure 11). Refer to this
diagram for all wiring connections.
3. Refer to Figure 1 on page 3 for the point of entry into the heater
for the supply voltage wire and thermostat wire. Standard size
knock-out holes are provided.
4. Thermostat wiring is for 24-volt thermostats only.
5. Thermostat connections are made on the circuit board inside the
heater.
6. Some thermostats may require the "C" common terminal for add-
ed functionality such as WIFI. Refer to the thermostat manufactur-
er's instructions.
7. The supply voltage and ground connections are made in the heat-
er using the proper sized wire nut connectors to the black, white,
and green/yellow wires.
8. The power supply to the heater must be provided by a fused
circuit with a disconnected switch located as close to the heater
as possible.
9. The power supply must be within 5 percent of the voltage rating
of the heater and each phase must be balanced within 2 percent
of each other. If not, advise the utility company.

OPERATION PROCEDURE

WARNING: Failure to confirm the proper orifice size and
manifold pressure for the installation location, gas and
elevation could result in death, injury, or property damage,
including fire or premature failure of the heater.
Never adjust the input rate, manifold pressure, or orifice size
to give a higher input rate.
WARNING: Failure to confirm the proper orifice size and
manifold pressure for the installation location, gas, and
elevation, will void the warranty of the electrical components
and heat exchanger.
This unit has been fully assembled and has had operational tests
performed at the factory. The following pre-operational procedures
should be performed to verify proper on-site installation operation.
NOTE: Do not bypass or jumper any controls.
1.
2.
3.
4.
5.
6.
7.
8.
9.
1 1
Compact Unit Heater
With the electric power turned off at the disconnect switch and
the manual gas valve turned off, perform a visual inspection to
verify the following:
a. All air openings are not obstructed or blocked.
b. The fan does not contact the fan guard or cabinet when
spun by hand.
c. All screws are tight.
d. The size of the orifice matches the data plate, or if applicable
the high altitude kit or propane conversion kit size.
e. The orifices are centered with the burners.
f. The air deflector louvers are in the desired direction and NOT
fully closed.
g. Confirm all wires and electrical connections are installed per
the wiring diagram and are securely fastened. Wires should
not be near the burner flame or other hot surfaces.
With the manual gas and electric disconnect turned off, install
an appropriate means and instruments to measure the inlet gas
pressure to the heater gas valve and the gas manifold pressure
(outlet pressure). Refer to Figure 12 on page 12 for the location
of the pressure taps for measuring the inlet gas pressure and gas
manifold pressure (outlet pressure).
Turn on the ELECTRICAL POWER ONLY at the disconnect switch.
The controls of this heater can determine if a pressure switch and
temperature limit switches are operating properly. Do not jumper
or bypass safety devices.
Make a call for heat on the thermostat and verify that the heater
controls function properly without gas. The sequence should be:
a. Call for heat from the thermostat.
b. The combustion blower pre-purge is 30 seconds.
c. The spark ignitor will turn on for 10 seconds after the pre-
purge.
d. Because the gas is turned off, the burners will not light and
the combustion blower will continue to operate.
e. After 30 seconds of inter-purge, the spark ignitor will turn on
for 10 seconds. This will repeat 1 more time for a total of 3
trials for ignition.
f. After the 3rd trial for ignition, the combustion blower will
continue to operate for 5 seconds. The LED on the control
should flash 2 times as shown in the "LED Diagnostic Code"
table located on the heater and in Table 10.
g. If the above sequence does not happen, refer to "Trouble
Shooting".
Turn off the electrical disconnect. Turn on the manual gas valve.
Use an appropriate gas leak detector to verify there are no gas
leaks, including in the gas pressure measuring instruments for the
inlet pressure and the manifold pressure.
Turn on the electric power. The thermostat should still be calling
for heat.
Any air in the gas line should have been purged from the system
following local/national codes during the gas piping installation.
Operating Instructions and Owner's Manual