User Guide

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FIGURE 10.1: LOCATION OF HIGH AND LOW VOLTAGE FIELD ELECTRICAL CONNECTIONS
The use of the pump outputs are as follows:
a) Boiler pump - Pumps water through the boiler. It is on whenever there is a call for CH or DHW.
b) DHW Pump (“IWH Circulator”) - Pumps water directly through the indirect water heater.
c) 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.
Maximum combined current draw for all circulators is 6.3 FLA.
2) Low Voltage Connections–LowvoltageeldconnectionsonthelowvoltagePCBareshowninFigure10.3andarelisted
from left to right:
1 HeatT’Stat-24VACheatingthermostat
2 HeatT’Stat-24VACheatingthermostat
3 DHW Stat - 24VAC domestic hot water thermostat (1)
4 DHW Stat - 24VAC domestic hot water thermostat (2)
5 External Limit - Field supplied low voltage safety limit contacts (1)
6 External Limit - Field supplied low voltage safety limit contacts (2)
7 Outdoor Sensor - Tasseron TSA00AA Outdoor Temperature Sensor (1)
8 Outdoor Sensor - Tasseron TSA00AA Outdoor Temperature Sensor (2)
External power must not be applied to any of the low voltage terminals - doing so may damage the boiler control. Also note
the following:
a) External Limit-Theexternallimitterminalsareintendedforusewithaeldsuppliedsafetydevice,suchasamanual
reset high limit or low-water cut-off. When an external limit is used, the jumper between these two terminals must be
removed. Failure to remove this jumper will render the external safety devices ineffective.