Table18--BlowerOffDelaySetupPosition
PiNS 1 AND 2 2 AND 3 3 AND 4 4 AND 8
Time (in sec) 90 120 150 180
delay setting, move the jumper flora one set of pins on the conhol
board to the pins used for the desired blower off delay. Factoiw
blower off delay setting is 120 sec.
SET THERMOSTAT HEAT ANTI(IPATOR
When using a nonelectronic them_ostat, the them_ostat heat
anticipator must be set to match amp draw of components in R-W
circuit. Accurate amp draw measurements can be obtained at
thermostat subbase terminals R and W. Fig. 49 illustrates an easy
method of obtaining these measurements. The anap reading should
be taken after blower motor has started and furnace is heating.
Connect ammeter wires as shown in Fig. 49. The thermostat
anticipator should NOT be in the circuit while measuring current.
If them_ostat has no subbase, the them?ostat must be disconnected
from R and W wires during cun'ent measurement. See thermostat
manufacturer's instructions for adjusting heat anticipator and for
raving heating cycle tengd_.
For an electronic thermostat, set cycle rate for 3 cycles per hour.
CHECK SAFETY CONTROLS
This section covers the safety controls that must be checked be_bre
the installation is complete. The flame sensor, gas valve, and
pressure switch were all checked in the Start=up procedure section
as part of nom_al operation.
Step l--Check Primary Limit Control
This control shuts off gas control system and energizes air-
circulating blower motor it" fm'nace overheats Recommended
method of checking this limit control is to gradually block off
return air aker furnace has been operating for a period of at least
5 minutes. As soon as limit control has shut offburners, return-air
opening should be unblocked to pem_it nora?HI air circulation. By
using this method to check limit control, it can be established that
limit is t\mctioning properly and operates if there is a restricted
return-air duct or motor _i_ilure. If limit control does not [hnction
during this test, cause must be determined and con'ected.
Step 2--Check Pressure Switch
This control pIoves opeiation of draf_ inducer (heel< switch
operation as fbllows:
1. Turn off 115-v power to furnace.
TERMINALS WITH
THERMOSTAT REMOVED
2 Remove main fi/rnace door and disconnect inducer motor lead
wires flora wire harness.
3. Turn on 115-v power to furnace.
4 Set them_ostat to "call for heat" and wait 1 minute When
pressure switch is _imctioning properly, hot surface igniter
should NOT glow, and control status code LED flashes status
code 31 _imlt. [f hot sur_itce igniter g!ows when inducer motor
is disconnected, shut furnace down immediately. Determine
reason pressure switch did not function properly and correct
condition.
5. Turn off 115=v power to _i/rnace.
6. Reconnect inducer motor leads, reinstall main furnace door,
and mm on 115=v power supply.
CHECKUST
1 Put away tools and instruments. (lean up debris.
2 Verify flame rollout manual reset switch has continuity.
3. Verify that blower and main access doors are properly
installed.
4. Cycle test fi_rnace with room them_ostat.
5. Check operation of accessories per manufacturer's instl_ac-
lions.
6 Review User's Guide with owner
7. Leave literature packet near furnace.
FROM UNIT 24-VOLT
TERMINAL BLOCK
EXAMPLE: 5 0 AMPS ON AMMETER = 0.5 AMPS FOR THERMOSTAT SETTING
10 TURNS AROUND JAWS
A80201
Fig. 49--Amp Draw Check w{th Ammeter
45
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