INSTALLATION AND OPERATION INSTRUCTIONS
1-30
HC SERIES BOILERS HC 13-50, HC 23-84, HC 29-106, HC 20-125, HC 33-160
1.8.2 Power Quality and Electrical Protection
In areas of unreliable power, appropriate surge protectors and or power
conditioning equipment should be installed to protect the boiler.
1.8.3 Zone Valve and Zone Pump Connections
Zoning can be accomplished with either zone pumps or zone valves. In either
case the controls and relays that may be required to accomplish this will need to
be installed externally.
Zone Valve end switches can be wired to together in parallel and connected to
a fan center relay. See Figure 36 and 37. Do not apply power to the X4 terminal
strip. Alternately the zone valves and thermostats can be connected to a zoning
panel control system available from your local heating wholesaler.
Zone Pumps can be connected to the boiler with a zone pump control available
from your local heating wholesaler.
1.8.4 Thermostat / Sensor Wiring
A Thermostat from a single zone heating system can be connected directly to the
controller’s terminals X4.6 and X4.7. Do not apply power to the X4 terminal strip.
The Outdoor Sensor is not required for the boiler to operate. If the outdoor sensor
is not connected, the boiler will operate at the designated maximum space
heating water temperature. If outdoor reset functionality and the Summer Shut
Down feature is required then the Outdoor Sensor must be connected to X4.8
and X4.9. The Outdoor Sensor is a 12K ohm thermistor type sensor. The sensor
should be installed on the exterior of the building on the north side. The sensor
should be installed so that it is not effected by any heat sources from the building
such as a dryer or exhaust fan outlet, relief air or combustion air grill above a
window or door, or mounted directly under a deck or soft overhang.
DHW Aquastat or 10KΩ sensor can be connected to the controller’s terminals
X4.9 and X4.10. Do not apply power to the X4 terminal strip.
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