Carrier 59SP5A Installation, Start-Up, Operating And Service And Maintenance Instructions page 57

START-UP, ADJUSTMENT, AND SAFETY
CHECK
General
1. Furnace must have a 115-v power supply properly connec-
ted and grounded.
NOTE: Proper polarity must be maintained for l15-v wiring.
Control status indicator light flashes rapidly and furnace does not
operate if polarity is incorrect.
2. Thermostat wire connections at terminals R, W, G, and
Y/Y2 must be made at 24-v terminal block on furnace con-
trol.
3. Natural gas service pressure must not exceed 0.5 psig (14-
in. w.c.), but must be no less than 0.16 psig (4.5-in. w.c.).
4. Blower door must be in place to complete l15-v electrical
circuit to furnace.
UNIT OPERATION HAZARD
Failure to follow this caution may result in intermittent unit
operation or performance satisfaction.
These furnaces are equipped with a manual reset limit
switch in burner assembly. This switch opens and shuts off
power to the gas valve is an overheat condition (flame
rollout) occurs in burner assembly. Correct inadequate
combustion-air supply or improper venting condition
before resetting switch. DO NOT jumper this switch.
Before operating furnace, check flame rollout manual reset switch
for continuity. If necessary, press button to reset switch.
EAC-I terminal is energized whenever blower operates. HUM
terminal is only energized when blower is energized in heating.
Prime Condensate Trap with Water
[]NIT 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. 57.)
2. Connect field-supplied 1/2-in. (13 mm) OD tube to upper
collector box drain connection.
3. Insert field-supplied funnel into tube.
4. Pour one quart of water into funnel/tube. Water should run
through collector box, overfill condensate trap, and flow in-
to open field drain.
5. Remove funnel; replace collector box drain plug.
6. Connect field-supplied l/2-in. (13 mm) OD tube to middle
collector box drain port.
7. Pour one quart of water into funnel/tube. Water should run
through collector box, overfill condensate trap, and flow in-
to open field drain.
8. 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,
FIRE OR EXPLOSION HAZARD
Failure to follow this warning could result in personal
iniury, 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 iniury or loss of
life.
Adjustments
FIRE HAZARD
Failure to follow this warning could result in personal
iniury, 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.
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.
52.)
For proper operation and long term reliability, the Furnace input
rate must be within +2 percent of input rate on furnace rating plate.
The gas input rate on rating plate is for installations at altitudes up
to 2000 ft. (609.6M).
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.
In Canada, the input rating must be derated by 5 percent for
altitudes of 2000 ft. (609.6M) to 4500 ft. (1371.6M) above sea
level.
To adjust manifold pressure to obtain the proper input rate, first,
determine if the furnace has the correct orifice installed. At higher
altitudes or different gas heat contents, it may be necessary to
change the factory orifice to a different orifice. Tables have been
provided in the furnace installation instructions to match the
required orifice to the manifold pressure to the heat content and
specific gravity of the gas. To do this:
a. Obtain average yearly gas heat value (at installed altitude)
from local gas supplier.
b. Obtain average yearly gas specific gravity from local gas
supplier.
c. Find installation altitude in Table 20.
d. Find closest natural gas heat value and specific gravity in
Table 20.
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