Recheck temperature rise. It must be within limits specified on unit rating plate. Recommended operation is at midpoint of rise or above.
3.Set thermostat heat anticipator.
The thermostat heat anticipation must be set to match the amp draw of the electrical components in the
NOTE: When using an electronic thermostat, set cycle rate for 3 cycles per hr.
THERMOSTAT SUBBASE TERMINALS WITH THERMOSTAT REMOVED (ANITICIPATOR, CLOCK, ETC.,
MUST BE OUT OF CIRCUIT.)
AMMETER
R Y W G
10 TURNS
FROM UNIT
CONTROL TERMINALS
EXAMPLE: | 5.0 AMPS ON AMMETER | = | 0.5 AMPS FOR THERMOSTAT | |
10 TURNS AROUND JAWS | ANTICIPATOR SETTING | |||
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A96316
Fig. 20ÐAmp Draw Check With Ammeter
CHECK SAFETY CONTROLS
The flame sensor, gas valve, and pressure switch were all checked in the
1.Check primary limit control.
This control shuts off the combustion control system and energizes the
The preferred method of checking the limit control is to gradually block off the return air after the furnace has been operating for a period of at least 5 minutes. As soon as the limit has shut off the burners, the
2.Check blocked vent safeguard switch.
The purpose of this control is to permit the safe shutdown of the furnace during certain blocked vent conditions.
a.Disconnect power to furnace and remove vent connector from furnace outlet collar. Be sure to allow time for vent pipe to cool down before removing.
Copyright 1999 CARRIER Corp. · 7310 W. Morris St. · Indianapolis, IN 46231
b.Restore power to furnace and set room thermostat above room temperature.
c.After normal
d.Remove blockage and reconnect vent pipe to furnace outlet collar.
e.Wait 5 minutes and then reset blocked vent safeguard switch.
3.Check pressure switch.
This control proves operation of draft inducer blower.
a.Turn off
b.Remove control door and disconnect inducer motor lead wires from wire harness.
c.Turn on
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. Determine reason pressure switch did not function properly and correct condition.
e.Turn off
f.Reconnect inducer motor wires, replace control door, and turn on
4.Check auxiliary limits (when used).
a.Turn off
b.Remove blower access door.
c.Disconnect red motor lead at blower speed selector. Mark terminal for proper reconnection.
d.Replace blower access door.
e.Turn on
f.Allow furnace to operate until auxiliary limit activates, but DO NOT operate furnace longer than 4 minutes.
g.If furnace operates for 4 minutes, check/replace limit switch(es).
h.Turn off
i.Remove blower access door.
j.Reconnect red motor lead, reset switch, and replace door.
k.Turn on
CHECKLIST
1.Put away tools, instruments, and clean up debris.
2.Verify manual reset switches have continuity.
3.Ensure blower and control access doors are properly installed.
4.Cycle test furnace with room thermostat.
5.Check operation of accessories per manufacturer's instruc- tions.
6.Review User's Manual with owner.
7.Leave literature packet near furnace.
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Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Book | 1 | 4 | PC 101 | Catalog No. | Printed in U.S.A. | Form | Pg 20 | Replaces: | ||
| Tab | 6a | 8a |
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