Important, Auxiliary load control, Secondary loop primary loop – Steffes 7140 User Manual
Page 24: Installation
AUXILIARY LOAD CONTROL
The Comfort Plus Commercial Hydronic system can be used to provide control signals to other loads in the
application. To do so, connect low voltage control wires to the "COM" and "NC" or the "COM" and "NO" posi-
tions of the six (6) position low voltage terminal block in the electrical compartment of the Comfort Plus Commer-
cial Hydronic. (See Figure 19.) These contacts are rated for 30 volts, 3 amps maximum.
IMPORTANT
Maximum external load should
not exceed 60 VA on the system's
class II transformer.
TYPICAL SYSTEM PLUMBING
(SHOWN WITH STEFFES AIR HANDLER)
FIGURE 18
It is the responsibility of the installer to prevent involuntary flow of water to the air handler. Not
doing so may cause limit tripping and/or decrease heat pump efficiency. Use of a check valve,
zone valve, or other device may help prevent involuntary flow.
IMPORTANT
Installation
Installation
n
3.13
Comfort Plus Commercial Hydronic
NOTE: During off-peak (charge) periods, the contact is
closed between "COM" and "NC".
TYPICAL AUXILIARY LOAD CONTROL
FIGURE 19
RP
Y
C
R
O
G
Y2
OS
H
W
O2
SC
DS
Auxiliary Control Relay
RELAY
Peak Control
Internal
Output Relay
COM
AP
P
NO
NC
White
Orange
White
Black
Secondary Loop
Primary Loop
Primary
Loop Pump
High Temp
Water
5100 Air
Handler
To
Other
Zones
Mixing
Valve
This Valve Must
Be Open During
Normal Operation
From
Other
Zones
Comfort +
Hydronic
Exchanger
Red
White
-
-
+
Low Temp Radiant Zones
CHECK
VALVE