HARDY MANUFACTURING CO., INC (MODEL H25) PAGE 24
SECTION VII
SERVICE INFORMATION
7-1 Water Circulation System
LOW TEMPERATURE SENSOR, P/N H2000.36 – (WARNING: When working with
electrical circuits, use caution to avoid electrical shock) – This sensor can be wired
in the home heat thermostat circuit to prevent the pump on the heater from running
when the water in the wood heater is not hot. The sensor has a set of contacts that
close when the water rises to 110ºF and open when the water drops to 90ºF.
WATER PUMP RELAY, P/N H2000.52 - (WARNING: When working with electrical
circuits, use caution to avoid electrical shock) – This is a Honeywell DPDT relay
with a 24 volt coil. Terminal 4 and 6 (normally open contacts) are used to turn on
the water pump. Control voltage (24 volts) connected at terminals 7 and 8 routed
through a home thermostat energizes the relay.
WATER PUMP FOR HEATING SYSTEM, Taco 009 pump P/N H502.00 - (WARNING:
When working with electrical circuits, use caution to avoid electrical shock) – with
bronze body. If the pump will not run, first unplug the power cord then check the
water pump relay. The relay can be bypassed by disconnecting the wire from
terminal 6 and then connecting to terminal 5 (terminals 4 to 5 is normally closed)
remove the thermostat wire from terminal 8 and plug the power cord back in. This
should supply 115 vac directly to the pump. If the pump will still not run, unplug the
power cord. Remove the four bolts holding the pump to the pump housing. Remove
the cartridge from the pump. Spin the impeller by hand to see if the cartridge is
locked up. If the impeller will not spin, replace the cartridge. If the impeller will spin,
it may have been temporarily stuck (reassemble and try again) or the problem is the
electrical winding or capacitor. Use an ohm meter to check the winding and
capacitor. If the capacitor is defective, replace it. If the electrical winding is
defective, replace the complete pump.
1
2
3
4
5
6
7
8
115 volts
Relay p/n H2000.52
Low Temperature Sensor
p/n H2000.36
Pump
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