Adjustments - International comfort products R80ESN Installation Instructions Manual

imately 2 sec). Gas valve and humidifier will not be turned
on. (See Fig. 24.)
WARNING
!
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal
injury, or death.
Blower access door switch opens 115- -v power to control.
No component operation can occur unless switch is closed.
Caution must be taken when manually closing this switch
for service purposes.
NOTE: The furnace control allows all components, except the
gas valve, to be run for short period of time. This feature helps
diagnose a system problem in case of a component failure.
Component test feature will not operate if any thermostat signal is
present at the control.
Component test sequence is as follows:
Refer to service label attached to furnace or see Fig. 44.
a. LED will display previous status code 4 times.
NOTE: If no previous code is present, go directly to b.
b. Inducer motor starts and continues to run until Step f of
component test sequence.
c. Hot surface igniter is energized for 15 sec., then off.
d. Blower motor operates on HEAT speed for 10 sec.
e. Blower motor operates on COOL speed for 10 sec.
f. Inducer motor stops.
g. Reconnect R lead to furnace control board, release blower
door switch and re- -install blower door.
4. Operate furnace per instruction on door.
5. Verify furnace shut down by lowering thermostat setting
below room temperature.
6. Verify furnace restarts by raising thermostat setting above
room temperature.

Adjustments

WARNING
!
FIRE HAZARD
Failure to follow this warning could result in 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.
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.
42.)
Furnace gas input rate on rating plate is for installations at
altitudes up to 2000 ft. (610 M). Furnace input rate must be
within +/- -2 percent of furnace rating plate input.
32
1. Determine the correct gas input rate.
The input rating for altitudes above 2,000 ft. (610 M) must
be reduced by 4 percent for each 1,000 ft. (305 M) above
sea level. For installations below 2000 ft. (610 M), refer to
the unit rating plate. For installations above 2000 ft. (610
M), multiply the input on the rating plate by the de- -rate
multiplier in Table 10 for the correct input rate.
2. Determine the correct orifice and manifold pressure adjust-
ment.
There are two different orifice and manifold adjustment ta-
bles. All models in all positions, except Low NOx models
in downflow or horizontal positions, use Table 12 (22,000
Btuh/Burner).
Low NOx models in the downflow or horizontal positions
must use Table 13 (21,000 Btuh/Burner). See input listed
on rating plate.
a. Obtain average yearly gas heat value (at installed altitude)
b. Obtain average yearly gas specific gravity from local gas
c. Find installation altitude in Table 12 or 13.
d. Find closest natural gas heat value and specific gravity
e. Follow heat value and specific gravity lines to point of
f. Check and verify burner orifice size in furnace. NEVER
g. Replace orifice with correct size if required by Table 10,
Table 10 – Altitude Derate Multiplier for U.S.A.
ALTITUDE
0–2000 (0--- 610)
2001–3000 (610--- 914)
3001–4000 (914--- 1219)
4001–5000 (1219--- 1524)
5001–6000 (1524--- 1829)
6001–7000 (1829--- 2134)
7001–8000 (2134--- 2438)
8001–9000 (2438--- 2743)
9001–10,000 (2743--- 3048)
* Derate multiplier factors are based on midpoint altitude for altitude
range.
EXAMPLE 1: (0 to 2000 ft. (0 to 610 M) altitude)
For 22,000 Btuh per burner application use Table 12.
Heating value = 1000 Btuh/cu ft.
Specific gravity = 0.62
Therefore: Orifice No. 43*
Manifold pressure: 3.7- -In. W.C.
*Furnace is shipped with No. 43 orifices.
In this example all main burner orifices are the correct
size and do not need to be changed to obtain proper input
rate.
3. Adjust manifold pressure to obtain correct input rate.
a. Turn gas valve ON/OFF switch to OFF.
b. Remove manifold pressure tap plug from gas valve. (See
c. Connect a water column manometer or similar device to
Specifications are subject to change without notice.
from local gas supplier.
supplier.
in Table 12 or 13.
intersection to find orifice size and manifold pressure set-
tings for proper operation.
ASSUME ORIFICE SIZE. ALWAYS CHECK AND
VERIFY.
11, 12 and 13. Use only factory- -supplied orifices. See
EXAMPLE 1.
PERCENT
OF
DERATE
(FT. / M)
0
8–12
12–16
16–20
20–24
24–28
28–32
32–36
36–40
Fig. 41.)
manifold pressure tap.
DERATE
MULTIPLIER
FACTOR*
1.00
0.90
0.86
0.82
0.78
0.74
0.70
0.66
0.62
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