Hardy C3, Installation And Operating Instructions Manual, Page: 41 / 66

HARDY MANUFACTURING CO., INC (MODEL C3 & C5) PAGE 27
SECTION VI
SERVICE INFORMATION
6-1 Electric Make-Up Water System
LOW WATER SWITCH, P/N H1100.28 –
(WARNING: When working with electrical
circuits, use caution to avoid electrical shock) – The low water switch is a
horizontally mounted reed switch that has a magnet in the floating portion of the switch.
When the water level is high enough to raise the magnet up off of the reed switch this
allows the switch to break contact, and discontinue power to the low water light. When
the water level drops the floating portion of the low water switch the magnet will once
again come into close proximity of the reed switch and close the contacts allowing
power to be applied to the low water light. If this switch is working in an opposite order
to this it will need to be tightened another 180 degrees to allow the switch to operate
correctly. Never add any additional load to this switch since it is only rated for 30 watts.
LOW WATER LIGHT, P/N H1100.30 -
(WARNING: When working with electrical
circuits, use caution to avoid electrical shock) – 115 VAC indicator light controlled
by the float switch. The light comes on when the water level in the heater is low.
6-2 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 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 H502.50 –
(WARNING:
When working with electrical circuits, use caution to avoid electrical shock) . If
the pump will not run, first unplug the power cord then check the water pump relay.
The relay can be bypassed by moving the wire on terminal 6 to terminal 5 (terminals 4
to 5 is normally closed) and disconnecting the thermostat wire from terminal 8. Now
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 if it 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.