Comfort Plus Installation n 3.11
Installation
Low voltage wires MUST
never enter any line
voltage enclosure.
IMPORTANT
LOW VOLTAGE ELECTRICAL CONNECTIONS - ROOM
THERMOSTAT
A low voltage (24VAC) room thermostat is required for room temperature
control with the Comfort Plus Hydronic system. Steffes recommends using a
digital thermostat. If utilizing a mechanical thermostat, a load resistor may be
necessary due to the low current draw (.01 amps) on the heat call input circuit
of the Comfort Plus system. Contact the factory for information on thermostats
available from Steffes.
STAND ALONE FURNACE APPLICATION WITH VARIABLE SPEED BLOWER
CONNECTIONS SHOWN FOR SINGLE STAGE HEATING / SINGLE STAGE COOLING
(UNCONTROLLED AIR CONDITIONING)
FIGURE 14
SINGLE STAGE HEAT PUMP APPLICATION WITH VARIABLE SPEED BLOWER
FIGURE 15
IMPORTANT
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If installing a mechanical thermostat or thermostat with anticipator, a resistor kit is required
(Order Item #1190015).
IMPORTANT
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Thermostat
Stage
Thermostat
Output
Heat
Pump
Stage
% of
Selected
CFM
Heat Call Status
on Digital
Display*
Target
1 Y1/G 1 100% HC1 L048
2 Aux/Y1/G 1 100% HC2 L049
Fan G 0 400 cfm HCF N/A
Cool Y1/G/O 1 100% COOL N/A
H/E 0 100% HC3 L049
SINGLE STAGE HEAT PUMP
Contractor Use Only
* If multiple inputs are active,
system will display highest
Heat Call values.
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