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FIGURE 88
FULLY MODULATING – TYPICAL DUAL FUEL APPLICATION - TWO STAGE HEAT PUMP (NON-COMMUNICATING)
NON-COMMUNICATING
THERMOSTAT (1)
**WARNING: DO NOT APPLY 24VAC TO THE V/W2 TERMINAL ON THE IFC (THIS IS OFTEN DONE DURING SETUP, TROUBLESHOOTING AND/OR
DIAGNOSING PROBLEMS). DOING SO WILL DAMAGE THE THERMOSTAT.
FIGURE 89
WIRING DIAGRAM FOR SINGLE-STAGE HEAT (NON-COMMUNICATING)
*
NO MECHANICAL THERMOSTATS.
*
NO MECHANICAL THERMOSTATS.
**
40%, 65%, and 100% FIRING RATE IN SINGLE-STAGE OPERATION. 40% FIRING RATE IN TWO-STAGE OPERATION
** 40%, 65%, and 100% FIRING RATE IN SINGLE-STAGE OPERATION. 40% FIRING RATE IN TWO-STAGE OPERATION
(DIP SWITCH SET SW2 — SWITCHES 2 & 3 OFF).
(DIP SWITCH SET SW2 — SWITCHES 1 & 2 OFF).
*** 2 STG. COOLING ONLY.
*** 2 STG. COOLING ONLY.
110
1-STAGE ELECTRONIC THERMOSTAT*
(NON-COMMUNICATING)
Y
(Y
)
H
2
Y
(Y
)
***
L
1
**
Y Y
2
Y (Y
)
2
Y
(Y
)
***
L
1
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