Electrical Connections - Modine Manufacturing IPT Installation And Service Manual

INSTALLATION/START-UP PROCEDURE

Electrical Connections

WARNING
1. Disconnect power supply before making wiring connections
to prevent electrical shock and equipment damage.
2. All appliances must be wired strictly in accordance with
wiring diagram furnished with the appliance. Any wiring
different from the wiring diagram could result in a hazard
to persons and property.
3. Any original factory wiring that requires replacement must
be replaced with wiring material having a temperature
rating of at least 105°C.
4. Ensure that the supply voltage to the appliance, as indicated
on the serial plate, is not 5% greater than rated voltage.
CAUTION
Ensure that the supply voltage to the appliance, as indicated
on the serial plate, is not 5% less than the rated voltage.
1. Installation of wiring must conform with local building codes,
or in the absence of local codes, of 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. Make sure all multi-voltage components (motors,
transform ers, etc.) are wired in accordance with the power
supply voltage.
3. The unit must be wired strictly in accordance with the wiring
diagram furnished with the unit.
4. The power supply to the unit should be protected with a fused
disconnect switch or circuit breaker.
5. The power supply must be within 5 percent of the voltage
rating and each phase must be balanced within 2 percent of
each other. If not, advise the utility company.
6. External electrical service connections that must be
installed include:
a. Supply power connection (120 volts).
b. Connection of thermostats, summer/winter switches, or
any other accessory control devices that may be supplied
(24 volts).
7. Control wire used to connect the heater to the thermostat
must have adequate ampacity and insulation temperature
rating for the total connected load, see Table 21.2.
8. Under no circumstances should the electrical supply or
control wiring to the heater provide any assistance in the
suspension of the heater. Do not locate any wiring directly
above or below the heater.
9. All outdoor electrical connections must be weatherized to
prevent moisture from entering the electrical compartment.
10. Ensure proper polarity of unit and power source.
11. Refer to the unit dimensional drawings on Figure 20.1 for
the electrical knockout locations.
START-UP PROCEDURE
CAUTION
Purging of air from gas lines should be performed as
described in ANSI Z223.1 - Latest Edition "National Fuel
Gas Code", or in Canada, CAN/CGA-B149 codes.
18
IMPORTANT
Start-up and adjustment procedures should be performed
by a qualified service agency.
1. Turn off power to the unit at the disconnect switch. Check
that fuses or circuit breakers are in place and sized correctly.
Turn all hand gas valves to the "OFF" position.
2. Remove service access side burner access panel as outlined
on page 5 in section titled "Removal of Burner Side Access
Panels".
3. Check that the supply voltage matches the unit supply
voltage listed on the serial plate. Verify that all wiring is
secure and properly protected. Trace circuits to insure the
unit has been wired according to the wiring diagram.
4. If utilizing indoor air for combustion, ensure adequate
ventilation for intake of fresh air. Check to see that there are
no obstructions to the intake of the unit.
5. Perform a visual inspection of the unit to make sure no
damage has occurred during installation. Check reflectors to
ensure they are installed between 0° and 45° from the
horizontal plane.
6. Recheck the gas supply pressure. The inlet pressure to the
unit must be 6-7" W.C. for natural gas and 12-14" W.C. for
propane gas. The gas supply pressure must never exceed
14" W.C. If the pressure exceeds 14" W.C., a gas pressure
regulator must be added upstream of the combinations gas
valve.
7. Open the field installed manual shutoff valve and turn power
on to the unit.
8. Check to make sure that the main gas valve opens upon a
call for heat from the thermostat. Check the manifold gas
pressure (see main burner adjustment).
9. Check to insure that gas controls sequence properly (See
Control Operating Sequence).
During checkout procedure, use the following steps to
verify that the venting system is adequately sized:
1. Inspect the venting system for proper size and horizontal
pitch, as required in the National Fuel Gas Code ANSI
Z223.1 or CAN/CGA B149.1 or .2 Installation Code – latest
edition and these instructions. Determine that there is no
blockage or restriction, leakage, corrosion and other
deficiencies, which could cause an unsafe condition.
2. Insofar as practical, close all building doors and windows and
all doors between the space in which the unit(s) connected to
the venting system are located and other spaces of the
building. Turn on any exhaust fans so they shall operate at
maximum speed. Do not operate a summer exhaust fan.
3. Place the unit being inspected in operation. Adjust thermostat
so that the unit will operate continuously.
4. After it has been determined that each unit connected to the
venting system properly vents when tested as outlined above,
return doors, windows, exhaust fans, and any other gas-
burning unit to their previous condition of use.
5. If improper venting is observed during any of the above tests,
the venting system must be corrected.
6. If the venting system must be resized, it must conform with
the National Fuel Gas Code ANSI Z223.1 or CAN/CGA
B149.1 or .2 Installation Code – latest edition. If the venting
system must be resized, it should be resized to approach the
minimum size as determined using the appropriate table in
Appendix G of the National Fuel Gas Code ANSI Z223.1.
9-511