
HARDY MANUFACTURING CO., INC (MODEL C3 & C5) PAGE 18
3-3
Connecting to Existing Hydronic Systems
Using a new 24 volt transformer, a new 24 volt relay, and a low voltage wall thermostat
the following wiring diagram shows how to modify the existing boiler aquastat wiring.
By adding a normal open circuit into the existing aquastat wiring you can leave the
boiler aquastat set at the original factory setting. Set the new low voltage wall
thermostat approximately 3 degrees below the home heat thermostat.
If the heater were to get behind for any reason the boiler can come on and help
maintain the home temperature.
EXISTING
BOILER
AQUASTAT
7
1
5
6
3
4
2
8
24 VOLT
TRA NSFORMER
NEUTRA L
120 VOLT
40 VA
THERMOSTA T
NEW ROOM
W
R
Wiring to add Hardy Heater
to exsisting hydronic heating system.
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