Step 10—Start-Up, Adjustment, and Safety Check
GENERAL
NOTE:
Proper polarity must be maintained for 115-v wiring. If
polarity is incorrect, control status indicator light will flash rapidly
and furnace will not operate.
The furnace must have a 115-v power supply properly connected
and grounded. Proper polarity must be maintained for correct
operation. Thermostat wire connections at R, W, C, and Y must be
made at the 24-v terminal block on the control board. The gas
service pressure must not exceed 0.5 psig (14-in. wc), but must be
no less than 0.16 psig (4.5-in. wc).
This furnace is equipped with a manual reset limit switch or
fuse link in the gas control area. The switch or fuse link opens
and shuts off power to the gas valve if a flame rollout or
overheating condition occurs in the gas control area. DO NOT
bypass the switch. Correct inadequate combustion air supply
problem and reset the switch or replace the fuse link.
Before operating the furnace, check each manual reset switch for
continuity. If necessary, press the button to reset the switch.
The blower compartment door must be in place to complete the
115-v circuit to the furnace.
SEQUENCE OF OPERATION
Furnace control must be grounded for proper operation, or
control will lockout. Control is grounded through green wire
routed to gas valve and burner bracket screw.
Using the schematic diagram shown in Fig. 16, follow the
sequence of operation through the different modes. Read and
follow the wiring diagram very carefully.
NOTE:
If there is a power interruption and any thermostat call,
the control initiates a 90-sec blower only on period before starting
another cycle.
Notes:
1. Heat pump must have a high pressure switch for dual fuel applications.
2. Refer to outdoor equipment Installation Instructions for proper setup.
3. Select the "zone" position on the 2-speed heat pump control.
4. Outdoor air sensor must be attached in all dual fuel applications.
5. Dip switch No. 1 on Thermidistat should be set in OFF position for air conditioner installations. This is factory default.
6. Dip switch No. 1 on Thermidistat should be set in ON position for heat pump installations.
7. Dip switch No. 2 on Thermidistat should be set in OFF position for single-speed compressor operation. This is factory default.
8. Dip switch No. 2 on Thermidistat should be set in ON position for 2-speed compressor operation.
9. Configuration Option No. 10 "Dual Fuel Selection" must be turned ON in all dual fuel applications.
10. No connection should be made to the furnace HUM terminal when using a Thermidistat.
Fig. 14—Single-Stage Furnace with 2-Speed Outdoor Unit
A99439
HUMIDIFIER
(24 VAC)
COM
O
W
Y1
G
R
TWO-STAGE
THERMOSTAT
2-SPEED
AIR CONDITIONER
OR HEAT PUMP
W
G
C
C
DHUM
HUM
Y1
R
Y1
See notes 1, 2, and 9.
Y2
Y2
O
Y/Y2
R
W2
W3
FURNACE
CONTROL
Heat Pump
only
Heat Pump only
12
Summary of Contents for WEATHERMAKER 8000 58WAV
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