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4. Remove funnel; replace collector box drain plug.
5. Connect field-supplied 5/8-in. (16 mm) ID tube to middle
collector box drain port.
6. Pour one quart (liter)of water into funnel/tube. Water should
run through collector box, overfill condensate trap, and
flow into open field drain.
7. Remove funnel and tube from collector box and replace col-
lector box drain plug.
CAUTION
!
UNIT OPERATION HAZARD
Failure to follow this caution may result in intermittent unit
operation or performance satisfaction.
Condensate trap must be PRIMED or proper draining may
not occur. The condensate trap has two internal chambers
which can ONLY be primed by pouring water into the
inducer drain side of condensate trap.
Fig. 59 - - Priming Condensate Trap
Purge Gas Lines
If not previously done, purge the lines after all connections have
been made and check for leaks.
WARNING
!
FIRE OR EXPLOSION HAZARD
Failure to follow this warning could result in personal
injury, death, and/or property damage.
Never purge a gas line into a combustion chamber. Never
test for gas leaks with an open flame. Use a commercially
available soap solution made specifically for the detection
of leaks to check all connections. A fire or explosion may
result causing property damage, personal injury or loss of
life.
Adjustments
WARNING
!
FIRE HAZARD
Failure to follow this warning could result in personal
injury, death and/or property damage.
DO NOT bottom out gas valve regulator adjusting screw.
This can result in unregulated manifold pressure and result
in excess overfire and heat exchanger failures.
!
FURNACE DAMAGE HAZARD
Failure to follow this caution may result in reduced furnace
life.
The 26,000 BTUH model has a lower nominal manifold
pressure than other models. Do not adjust the natural gas
manifold pressure above 1.8- -in. W.C.
The 26,000 BTUH model can be identified by the green
label affixed to the solenoid of the gas valve.
Refer to the Adjustment section for setting the manifold
pressure.
USE TABLE 22 WHEN ADJUSTING 26,000 BTUH
MODEL MANIFOLD PRESSURE.
!
FURNACE DAMAGE HAZARD
Failure to follow this caution may result in reduced furnace
life.
DO
NOT
redrill
out- -of- -round holes, etc.) can cause excessive burner noise and
misdirection of burner flames. This can result in flame
impingement of heat exchangers, causing failures. See Fig.
60.
The NATURAL GAS manifold pressure adjustments in Tables
21 and 22 compensate for BOTH altitude AND gas heating
value. DO NOT apply an additional de- -rate factor to the
pressures show in Table 21 and 22. The values in this table
are NOT referenced to sea level; they are AS- -MEASURED
AT ALTITUDE.
The heating content of natural gas at altitude may already
A11392
provide for a reduction in capacity of the furnace. Be sure to
obtain the expected in- -season gas heating value of the gas
from the gas supplier BEFORE making any adjustments for
capacity or altitude.
adjustments to the furnace may be necessary at altitude for
certain gas heating values.
Refer to the instructions provided in the factory- -specified
LP/Propane conversion kit for instructions for setting gas
manifold pressures for LP/Propane applications.
52
CAUTION
CAUTION
orifices.
Improper
drilling
NOTICE
Refer to Table 21 and 22.
BURNER
ORIFICE
Fig. 60 - - Orifice Hole
(burrs,
No
A93059
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