Altitude Derate Multiplier For U.s.a - Carrier 110 Series Installation, Start-Up, Operating And Service And Maintenance Instructions

Check Safety Controls
The flame sensor, gas valve, and pressure switch were all checked
in the Start- -up procedure section as part of normal operation.
1. Check Main Limit Switch
This control shuts off combustion system and energizes air- -
circulating blower motor, if furnace overheats. By using this
method to check the temperature limit control, it can be es-
tablished that the limit is functioning properly and that the
limit will operate if there is a restricted return- -air supply or
motor failure. If the limit control does not function during
this test, the cause must be determined and corrected.
a. Run furnace for at least 5 minutes.
b. Gradually block off return air with a piece of cardboard or
sheet metal until the limit trips.
c. Unblock return air to permit normal circulation.
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
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 outer 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 into the PLT
connector. (Note: If there is a jumper connector plugged
into PLT, remove it and discard.) See Fig. 36.
3. Verify that the Blower/Heat Off Delay jumpers are set as
desired. See Fig. 36 and 65.
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 Fig. 56 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
instructions.
8. Review Owner's Manual with owner.
9. Attach entire literature packet to furnace.
2001–3000
3001–4000
4001–5000
5001–6000
6001–7000
7001–8000
8001–9000
9001–10,000
*Derate multiplier factors are based on midpoint altitude for altitude range.
1/8" NPT Inlet
Pressure Tap
per manufacturer's
63
Table 19 – Altitude Derate Multiplier for U.S.A.
ALTITUDE
FT. M
0–2000 0--- 610
610--- 914
914--- 1219
1219--- 1524
1524--- 1829
1829--- 2134
2134--- 2438
2438--- 2743
2743--- 3048
SINGLE-STAGE
ON/OFF Switch
1/2" NPT Inlet
Fig. 53 - - Gas Valve
Fig. 54 - - Orifice Hole
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
Fig. 55 - - Amp. Draw Check with Ammeter
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
Regulator Seal Cap
Regulator Adjustment
Regulator Seal Cap under Cap
1/2" NPT Outlet
1/8" NPT Manifold
Pressure Tap
A11153
BURNER
ORIFICE
A93059
0.5 AMPS FOR THERMOSTAT
ANTICIPATOR SETTING
A96316