6. Use the existing screws to
mount the high altitude pressure
switch to the center panel;
7. Reattach the hose from the IDB
to the pressure switch:
8. Reattach the wires:
9. Turn on electrical power and
operate the unit through several
cycles to confirm proper
operation.
At elevations above 8000 feet both
the pressure switch and the orifices
must be installed.
To replace the orifices:
1. Turn off the gas to the unit at
the manual gas valve outside
the unit;
2.
Turn off electrical power to
the unit;
3. Disconnect the gas line from
the system at the union inside
the furnace.
4. Remove the four (4) screws
holding the gas manifold to the
burner brackets and
remove the
manifold assembly.
Take care not to damage the
wiring or hot surface igniter.
5.
Remove the existing orifices
from the gas manifold.
6. Replace them with the high
altitude orifices from the kit.
Screw them into the manifold
hand tight and then secure in
place with a quarter turn by
a wrench.
7. Replace the manifold on the
burner brackets using the four
(4) existing screws.
8. Reattach the gas line at the
union.
9. Turn on the gas at the manual
gas valve and check for leaks.
10. Turn on electrical power and
operate the furnace through
several cycles to check for
proper operation.
ELECTRICAL CHECKS
Line Power Check
The furnace must have a nominal
115 volt power supply for proper
operation. If there is not a consistent
power supply, contact a licensed
electrician to correct the problem.
1. With the blower compartment
door off, manually hold the push
button door switch in.
2. Call for heat at the thermostat.
3. With the unit operating, use
a voltmeter to measure the
voltage from terminal L 1 to any
Neutral connection.
4. The voltage should be a nominal
115 volts.
This test should be made with the
unit in full operation.
FIGURE 76
LINE VOLTAGE MEASUREMENT
64
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