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26
Pilot Adjustment
1. Restart the fan and check the gas supply pressure at the inlet gas gauge upstream of all electronic
valves. The inlet pressure should be
5-14 inches wc
. If the inlet pressure is too high, install an
additional pressure regulator external to the unit.
2. Open the field-installed manual gas shut-off valve and the manual main gas valve on the combination
gas control valve.
3. Close the ball valve located inside the cabinet.
4. Call for heat with the intake air thermostat (turn set-point to temperature above outside air) and allow
the pilot to light. If the pilot does not light, purge the pilot line. If air purging is required, disconnect the
pilot line at the outlet of the pilot valve.
5. Check the
pilot flame voltage
at the Flame Safety Control interface test jacks. A weak pilot flame can
be caused by low gas pressure, or a dirty pilot orifice.
6. To adjust the pilot flame, remove the cap from the pilot adjustment screw on the combination gas
valve. Increase the pilot gas flow by turning the screw counter-clockwise. Decrease the pilot gas flow
by turning the screw clockwise. The pilot DC voltage should read
12V DC minimum and should
typically be 15V DC
.
7. Once the pilot has been established, open the main manual gas shut-off valve downstream of the
electronic valves. Check to make sure that the main gas valve opens, and gas flows to the burner.
Figure 14 - Pilot Assembly
Spark Connection
Flame Rod
Connection
Clearance = 2.96”
Flame Rod
Pilot Tube
Connection
Содержание D76
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