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10. When the burners light, verify the gas inlet pressure is between
6.0 to 14" W.C. (1.50-3.49 kPa) for natural gas and 1 1.0 to 14"
(2.74-3.49 kPa) for propane. If the gas pressure is not in this
range, consult with the gas supply company, installer, or qualified
service personnel to determine the cause.
11. Verify that the manifold pressure matches the value on the name
plate, or the value for the high-altitude installation or the value
for the propane conversion kit. Due to manufacturing tolerances
the gas manifold pressure may need to be adjusted to the exact
pressure for the installation.
12. To adjust the gas manifold pressure:
a.
Remove the regulator cap. See Figure 12.
b.
To increase the pressure, turn the regulator screw clockwise.
c.
To decrease the pressure, turn the regulator screw counter-
clockwise.
d.
Replace the regulator cap.
13. Verify that the circulating air fan turns on approximately 30 sec-
onds after the burner lights.
Figure 12 - Gas Valve Details
Model Size 100 through 200
14. Remove the call for heat from the thermostat.
15. After the burners turn off, the combustion blower should operate
16. After the fan stops, turn off the electric power and manual gas
17. Remove the gas pressure measuring instruments and install/tight-
18. Turn on the electric power and manual gas valve.
19. Check for gas leaks.
20. Make another call for heat on the thermostat.
21. After the burners light, check for gas leaks after the heater gas
22. Verify that the venting system is installed correctly and free from
13
Compact Unit Heater
for an additional 5 seconds and the circulating air fan should
operate for an additional 150 seconds.
valve.
en any fittings that were removed/used during the gas pressure
check.
valve, including any gas fittings used for measuring the gas
pressure.
obstructions. Before you start, use the following steps to verify
that the venting system is adequately sized:
Model Size 250 to 400
NOTE: The gas pressure taps are located
on the side and labeled as "IN P" and
"OUT P"
Operating Instructions and Owner's Manual
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