Prime Condensate Trap; Purge Gas Lines; Adjustments - Carrier 120 Series Operating Instructions Manual

4. Replace blower door.
Prime Condensate Trap with Water
WARNING
!
CARBON MONOXIDE POISONING HAZARD
Failure to follow these warnings could result in personal injury
or death.
Failure to use a properly configured trap or NOT
water- -priming trap before operating furnace may allow
positive pressure vent gases to enter the structure through drain
tube. Vent gases contain carbon monoxide which is tasteless
and odorless.
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.
1. Remove upper and middle collector box drain plugs oppos-
ite of the condensate trap. See Fig. 60.
2. Connect field-supplied 5/8-in. (16 mm) ID tube with at-
tached funnel to upper collector box drain connection. See
Fig. 60.
3. Pour one quart (liter) of water into funnel/tube. Water
should run through collector box, overfill condensate trap,
and flow into open field drain.
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.

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

CAUTION
!
FURNACE DAMAGE HAZARD
Failure to follow this caution could result in reduced furnace
life.
DO NOT push or force gas valve adjusting screw. This can
result in damage to the adjustment screw resulting in incorrect
manifold pressure, which can result in a no heat situation or
shorten the life of the heat exchangers.
WARNING
!
FIRE HAZARD
Failure to follow this warning could result in personal
injury, death and/or property damage.
DO NOT push or force gas valve adjusting screw. This can
result in damage to the adjustment screw resulting in
incorrect manifold pressure, which can result in a no heat
situation or shorten the life of the heat exchangers.
CAUTION
!
FURNACE DAMAGE HAZARD
Failure to follow this caution may result in reduced furnace
life.
DO NOT redrill orifices. Improper drilling (burrs,
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.
54.
For proper operation and long term reliability, the Furnace input
rate must be within +/- -2 percent of input rate on furnace rating
plate or as adjusted for altitude.
The gas input rate on rating plate is for installations at altitudes up
to 2000 ft. (609.6M).
NOTICE
The NATURAL GAS manifold pressure adjustments in Tables
21 and 22 compensate for BOTH altitude AND gas heating
value. DO NOT apply an additional derate factor to the
pressures show in Table 21 or 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
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. Refer to Table 21 or 22. No 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.
In the USA, the input rating for altitudes above 2000 ft. (609.6M)
must be reduced by 2 percent for each 1000 ft. (304.8M) above sea
level. Refer to Table 18.
64