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Field Wiring Applications (Continued)
Jumper Settings (See figure 4)
Thermostat
E20
W915
Y1 to Y2
Wiring Connections
FM21 Heat Pump / 1
Cool
SINGLE Leave Installed
CONTROL
TERM. STRIP
FM21
75VA, 24V
TRANSFORMER*
*Disconnect existing
furnace transformer and re-
place with 75VA, 24V trans-
former if defrost option to be
used.
NOTE − Wiring connections to
outdoor unit and thermostat
made at FM21 control board
per FM21 instructions.
NOTE −
Cut Y1/Y2 jumper
for two−stage
cooling.
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