Steffes 7140 - Manual (Page 21)

AIR CONDITIONER/HEAT PUMP INTERFACE
The Comfort Plus Commercial Hydronic system can be used in conjunction with an air conditioner or a heat pump.
Refer to the optional Air Handler (Page 2.02) and the Low Voltage Connections for Heat Pump Application
Diagram (Figure 13-14), for more information on interfacing these systems with the Comfort Plus Commercial
Hydronic. If multiple heat pumps are being interfaced, contact Steffes Corporation.
Installation
Comfort Plus Commercial Hydronic Installation
n
3.10
STAND ALONE FURNACE APPLICATION WITH VARIABLE SPEED BLOWER
CONNECTIONS SHOWN FOR SINGLE STAGE HEATING / SINGLE STAGE COOLING
(UNCONTROLLED AIR CONDITIONING)
FIGURE 15
If installing a mechanical thermostat or thermostat with anticipator, a resistor kit is required
(Order Item #1190015).
IMPORTANT
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TWO STAGE HEAT PUMP APPLICATION WITH VARIABLE SPEED BLOWER
FIGURE 14
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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 50% HC1 L048
2 Y1/Y2/G 2 100% HC1 L048
3 Aux/Y1/Y2/G 2 100% HC3 L049
Fan G 0 400 cfm HCF N/A
Cool 1 Y1/G/O 1 50% COOL N/A
Cool 2 Y1/Y2/G/O 2 100% COOL N/A
Hydronic
Heat Control H/E N/A N/A HC3 N/A
*Contractor Use Only
TWO STAGE HEAT PUMP