83
106375-01 - 4/16
Figure 10.1: Location of High and Low Voltage Printed Circuit Boards (PCB)
The use of the pump outputs are as follows:
a) System Pump - Pumps water through the radiation. This pump is hydraulically separated from the boiler pump,
either by closely spaced tees, or by a hydraulic separator. The system pump is always on when the system is
responding to a call for CH. Depending on the DHW configuration, it may also be on during a call for DHW.
b) DHW Pump (“IWH Circulator”) - Pumps water directly through the indirect water heater.
c) Boiler Pump - Pumps water through the boiler. Boiler pump is always on when the system is responding to a call
for CH. Depending on the DHW configuration, boiler pump may be turned off when system is responding to a call
for DHW.
Maximum combined current draw for all circulators is 6.3 FLA. See Section XII “Operation” for information on setting
up the pump operation.
2) Low Voltage Field Connections
– Low voltage field connections on the low voltage PCB are shown in Figure 10.3 and
are listed from top to bottom:
•
Heat T’Stat - 24VAC heating thermostat (R - 24V “Hot”)
•
Heat T’Stat - 24VAC heating thermostat (W - Energized or Call for Heat)
•
Heat T’Stat - 24VAC heating thermostat (C - 24V Common)
•
DHW T’Stat - 24VAC domestic hot water thermostat (1)
•
DHW T’Stat - 24VAC domestic hot water thermostat (2)
•
External Limit - Field supplied low voltage safety limit contacts (1)
•
External Limit - Field supplied low voltage safety limit contacts (2)
•
Alarm Contact (1)
•
Alarm Contact (2)
• Outdoor Sensor - Tasseron TSA00AA Outdoor Temperature Sensor (1)
• Outdoor Sensor - Tasseron TSA00AA Outdoor Temperature Sensor (2)
• Header Sensor - Optional Honeywell 32003971-003 Sensor (1)
• Header Sensor - Optional Honeywell 32003971-003 Sensor (2)
•
EnviraCOM Device (D)
•
EnviraCOM Device (R)
•
EnviraCOM Device (C)
• MODBUS - (A)
• MODBUS - (B)
• MODBUS - (-V)
X. Wiring
(continued)
LOW
VOLTAGE
PCB
HIGH
VOLTAGE
PCB
