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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 rated voltage.
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. All duct furnaces are provided with a wiring diagram located
on the inside door of the electrical junction box. Refer to this
wiring diagram for all wiring connections. For factory installed
options and field installed accessory wiring, refer to Set A and
Set B on the provided wiring diagram.
3. The power supply to the duct furnace should be protected
with a fused disconnect switch.
4. Refer to the unit serial plate (see Figure 23.1) for the amp
draw of the duct furnace. Size the disconnect switch to cover
the amp draw of the unit. For 460V and 575V units (Digit
14=F or G) a step down transformer is required. Model sizes
75-175 require a 250VA transformer and model sizes 200-400
require a 500 VA transformer.
5. Refer to the unit dimensional drawings on pages 16-17 for the
electrical knockout locations.
10
START-UP PROCEDURE
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. 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 that
the unit has been wired according to the wiring diagram.
3. Check to insure that the venting system is installed and free
from obstructions.
4. Check to see that there are no obstructions to the intake
and discharge of the duct furnace.
5. Perform a visual inspection of the unit to make sure no
damage has occurred during installation.
6. Turn on power to the unit at the disconnect switch. Check to
insure that the voltage between terminals 1 and 2 is 24V.
7. Check the thermostat, ignition control, gas valve, power
exhauster motor (Model Digit 3=P only), and supply fan
blower motor for electrical operation. If these do not
function, recheck the wiring diagram. Check to insure that
none of the Gas Control Options & Accessories (see page
14) have tripped.
8. Recheck the gas supply pressure at the field installed
manual-shut-off valve. The inlet pressure should be 6"-7"
W.C. on natural gas and 11"-14" W.C. on propane gas.
If inlet pressure is too high, install an additional pressure
regulator upstream of the combination gas control.
9. Open the field installed manual gas shut-off valve.
10. Open the manual main gas valve on the combination gas
control. Call for heat with the thermostat. On a call for
heat, the power exhauster relay will energize the power
exhauster motor (Model Digit 3=P only). Once the power
exhauster motor has reached full speed, the differential
pressure switch will close. The ignition controller will
attempt to light the pilot. If the pilot does not light, purge the
pilot line. If air purging is required, disconnect the pilot line
at outlet of pilot valve. In no case should the line be purged
into heat exchanger. Check the pilot flame length (See Pilot
Burner Adjustment).
11. Once the pilot has been established, check to make sure
that the main gas valve opens. Check the manifold gas
pressure (See Main Burner Adjustment) and flame length
(See Air Shutter Adjustment) while the circulating air blower
is operating.
12. Check to insure that gas controls sequence properly
(See Control Operating Sequence). Verify if the unit has
any additional control devices and set according to the
instructions in the Gas Controls Options.
13. Check vent system to see that combustion products are
being vented properly. Operate unit for several minutes and
then pass a lighted match around the edge of the diverter
relief opening. If the flame is drawn into the opening, the vent
system is drawing properly. If not, refer to page 22.
14. Once proper operation of the duct furnace has been
verified, remove any jumper wires that were required for
testing.
15. Close the electrical compartment door.
16. If installed at altitudes above 2,000', affix label included with
high altitude kit and fill in all fields with a permanent marker.
5-564.4
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