
HARDY MANUFACTURING CO., INC (MODEL C3 & C5) PAGE 23
4-1
Connection to Central Unit / Existing Blower Relay (continued)
At the air handler inside, find the red wire going from the air handler control wiring to
the original wall thermostat. Cut this wire and connect the end that is going to the wall
thermostat to terminal # 2 on the new relay. The end of the red wire that is still
connected to the control wiring of the air handler will need to be connected to terminal
# 1 along with the new red wire that is going to the new heat only wall thermostat.
Locate the green wire going from the Central air handler control wiring to the original
wall thermostat. Cut this wire. Connect the end of the green wire that is going to the
original wall thermostat to terminal #5 of the new relay. Connect the end of the green
wire that is still connected to the central air handler control wiring to terminal #4.
Connect the white wire going to the new heat only thermostat to the red wire going
outside to the heater. Take the green wire that is going outside to the heater and along
with a short jumper wire (appx. 3” - 4” long) connect to terminal #7 on the new relay
that was added to the air handler. Connect the other end of this jumper wire to terminal
#6 of the relay.
Locate the low voltage transformer that is providing you with 24 volt power. Find the
common lead of this transformer and connect a wire to this lead and to terminal #8 of
the new relay along with the white wire going outside to the heater.
If all connections are made properly and the water in the heater is hot, the unit should
be ready for operation.
NOTE: This is a general diagram. You may have to make various changes according
to how your unit is wired. Insure that the compressor on a heat pump or A/C unit does
not run when the coal system is running. Insure that the gas burner, oil burner, or
electric elements do not come on when the coal system is running. Insure that only
one speed of the blower motor can be energized at one time. If more than one speed
is energized at the same time, the blower motor will burn out. Insure that the volt amp
rating of the existing 24 volt transformer is not exceeded when the relays in the coal
heating system are energized.
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