Adjustments - Carrier N96MSN Installation, Start-Up, Operating And Service And Maintenance Instructions

N96MSN: Installation, Start-up, Operating and Service and Maintenance Instructions
Fig. 61 – 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.
CAUTION
!
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 26 WHEN ADJUSTING 26,000 BTUh MODEL
MANIFOLD PRESSURE.
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
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
A11392
If orifice hole appears damaged or it is suspected to have been redrilled,
check orifice hole with a numbered drill bit of correct size. Never
redrill an orifice. A burr-free and squarely aligned orifice hole is
essential for proper flame characteristics.
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).
The NATURAL GAS manifold pressure adjustments in
Table 26 compensate for BOTH altitude AND gas heating value. DO
NOT apply an additional de-rate factor to the pressures show in
Table 25 and Table 26. 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 26. 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 25 or
Table 23 adjust for BOTH altitude and natural gas heating value.
In Canada, the input rating must be reduced by 5 percent for altitudes of
2000 ft. (609.6M) to 4500 ft. (1371.6M) above sea level. The natural gas
manifold pressures in
heating value.
57
CAUTION
!
Fig. 62.
BURNER
ORIFICE
A93059
Fig. 62 – Orifice Hole
NOTICE
!
NOTICE
!
Table 26. The natural gas manifold pressures in
Table 25 adjust for BOTH altitude and natural gas
A93059
Table 25 and
Table 25 and