Steffes 6140 - Manual (Page 20)

Installation
n
3.11 Comfort Plus Commercial
Installation
LOW VOLTAGE ELECTRICAL CONNECTIONS -
ROOM THERMOSTAT
A low voltage (24VAC) room thermostat can be used 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.
SINGLE STAGE HEAT PUMP APPLICATION WITH VARIABLE SPEED BLOWER
FIGURE 15
IMPORTANT
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Low voltage wires MUST
never enter any line
voltage enclosure.
IMPORTANT
STAND ALONE FURNACE APPLICATION WITH VARIABLE SPEED BLOWER
CONNECTIONS SHOWN FOR SINGLE STAGE HEATING / SINGLE STAGE COOLING
(UNCONTROLLED AIR CONDITIONING)
FIGURE 14
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
Discharge Air
Temperature
Target
1 Y1/G 1 100% HC1 L048
2 Aux/Y1/G 1 100% HC3 L049
Fan G 0 400 cfm HCF N/A
Cool Y1/G/O 1 100% COOL N/A
Emergency
Heat H/E N/A 100% HC3 L049
*Contractor Use Only
SINGLE STAGE HEAT PUMP