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INSTALLATION
MOUNTING AND WIRING
Refer to Typical System Wiring Diagram on page 3
NOTE: All wiring should be installed according to local and
national electrical codes and ordinances.
1. Disconnect electrical power and gas supply to unit, then
remove unit access panel.
2. Mark and disconnect all wires from the existing control,
then remove the old control.
3. Mount and new control board in the unit and reconnect
all the wires.
4. Verify Stage Delay, Heat Off Delay, Trial for Ignition, Heat
On Delay, and Cool Off Delay settings by matching prior
boards configuration or refer to Dipswitch Configuration
section of instructions and original OEM install manual
and wiring diagrams.
5. If replacing 50A51 control, set Trial for Ignition for 7
seconds.
DIPSWITCH CONFIGURATION
SW1
Off*
OFF
Auto
OFF
Trial for Ignition (sec.)
SW2
4*
1
2
3
OFF
NOTES:
•
Cycle power after changes are made.
•
For best results, set dip switches to prior boards
configuration or refer to original OEM install manual for
further details.
2
Stage (W2) Delay (mins.)
1
1
10
2
2
3
3
4
4
ON
OFF
1
1
20
2
2
3
3
4
4
ON
OFF
Heat On Delay (sec.)
SW2
7
45*
1
1
2
2
3
3
ON
ON
OFF
OFF
6. Secure any wiring with the provided cable ties as
necessary.
7. Reinstall unit access panels and reconnect electric power
and gas supply to the unit.
8. Verify unit operation by placing thermostat in heating
mode and initiating a call for heat by adjusting thermostat
5 degrees above room temperature.
NOTES:
•
Motor lead extensions are included to be used if the
original wiring does not reach the control after mounting.
•
Lennox applications will require connection to the
stand alone flame probe terminal.
•
The installer may have to modify existing ignitor hole to
accommodate the larger 21D64-2 (ceramic diameter
0.394")
When replacing Amana 50A51-225, Amana 50A51-235,
•
and York 50A51-243, "CIRC INPUT" is a redundant line
voltage connection which should be taped and tied off.
Heat Off Delay (sec.)
SW1
1
2
3
90*
4
ON
ON
OFF
1
2
3
120
4
ON
OFF
ON
Cool Off Delay (sec.)
SW2
30
1
1
2
2
3
3
ON
ON
OFF
OFF
•
Only use Stage W2 delay with single-stage thermostat.
•
AUTO mode is based on an algorithm method of
energizing the second stage gas valve based on the
recent average of the heating duty cycle.
1
2
3
150
4
ON
OFF
1
2
3
180
4
OFF
ON
60*
0
1
2
3
ON
ON
OFF
*default
- Quick Links:
- Dip Switch Configuration
- Wiring Diagram
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