Checklist; Altitude Derate Multiplier - International comfort products R9MSB0601716A Service And Technical Support Manual

d. Burners will re−light when furnace cools down.
2. Check Pressure Switch(es)
This control proves operation of the draft inducer
blower.
a. Turn off 115−v power to furnace.
b. Disconnect inducer motor lead wires from wire
harness.
c. Turn on 115−v power to furnace.
d. Set thermostat to "call for heat" and wait 1 minute.
When low pressure switch is functioning properly, hot
surface igniter should NOT glow and control
diagnostic light flashes a status code 31. If hot
surface igniter glows when inducer motor is
disconnected, shut down furnace immediately.
e. Determine reason low pressure switch did not
function properly and correct condition.
f. Turn off 115−v power to furnace.
g. Reconnect inducer motor wires, replace door, and
turn on 115−v power.
h. Blower will run for 90 sec before beginning the call
for heat again.
i. Furnace should ignite normally.

Checklist

1. Put away tools and instruments. Clean up debris.
2. Verify that the jumper is removed from the TEST/
TWIN terminal. Verify that there is nothing plugged in-
to the PLT connector.
NOTE: If there is a jumper connector plugged into PLT,
remove it and discard. (See Figure 2)
3. Verify that the Blower/Heat Off Delay jumpers are set
as desired. (See Figure 2 and Figure 16)
4. Verify that the blower (lower door in upflow position)
and control ("Main" or upper door in upflow position)
doors are properly installed.
5. Verify that the Status LED glows. If not, check that the
power supply is energized and that the blower door is
secure. See Figure 5 to interpret diagnostic codes
6. Cycle test furnace with room thermostat to be sure
that it operates properly with the room thermostat.
Check all modes including Heat, Cool and Fan.
7. Check operation of accessories per manufacturer's
instructions.
8. Review Owner's Manual with owner.
9. Attach literature packet to furnace.
Table 2 – Altitude Derate Multiplier for U.S.A.
ALTITUDE
FT. M
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.
440 04 6000 00
.
PERCENT DERATE
OF MULTIPLIER
DERATE FACTOR*
0 1.00
4−6 0.95
6−8 0.93
8−10 0.91
10−12 0.89
12−14 0.87
14−16 0.85
16−18 0.83
18−20 0.81
Specifications subject to change without notice.
SINGLE-STAGE
ON/OFF Switch
1/2" NPT Inlet
1/8" NPT Inlet
Pressure Tap
Figure 3 − Gas Valve
THERMOSTAT SUBBASE
TERMINALS WITH
THERMOSTAT REMOVED
(ANITICIPATOR, CLOCK, ETC.,
MUST BE OUT OF CIRCUIT.)
HOOK-AROUND
AMMETER
R Y W G
10 TURNS
FROM UNIT 24-V
CONTROL TERMINALS
5.0 AMPS ON AMMETER
=
EXAMPLE:
10 TURNS AROUND JAWS
Figure 4 − Amp. Draw Check with Ammeter
Regulator Seal Cap
Regulator Adjustment
Regulator Seal Cap under Cap
1/2" NPT Outlet
1/8" NPT Manifold
Pressure Tap
A11153
0.5 AMPS FOR THERMOSTAT
ANTICIPATOR SETTING
A96316
7