AUXILIARY LOAD CONTROL
The Comfort Plus 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" positions of the six (6)
position low voltage terminal block in the electrical compartment of the Comfort Plus Hydronic. (See Figure 17.)
These contacts are rated for 30 volts, 3 amps maximum.
If control of external line voltage devices is
desired, contact the factory and order the Auxil-
iary Control Relay (Order Item # 1302010) or the
Auxiliary Control Relay with Override (Order
Item #1302012).
IMPORTANT
Maximum external load should
not exceed 60 VA on the system's
class II transformer.
NOTE: During off-peak (charge) periods, the contact is
closed between "COM" and "NC".
TYPICAL AUXILIARY LOAD CONTROL
FIGURE 17
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
TYPICAL SYSTEM PLUMBING
(SHOWN WITH STEFFES AIR HANDLER)
FIGURE 16
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
Red
White
-
-
+
Low Temp Radiant Zones
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
C
Hydronic
Exchanger
In
st
al
la
ti
on
Installation
3.13
Comfort Plus Hydronic
