Electrical - Low Voltage Wiring - Heat Controller R-410A Installation, Operation & Maintenance Manual

Installation & Operation
Electrical-Low Voltage
Thermostat Connections
The aquastat/thermostat should be wired directly to the CXM
board as shown in Figure 7a for HWW036-060 and Figure
7b for the HWW120. Note the HWW second stage is wired
directly to the CXM #2.
Figure 7a. HWW036-060 Low Voltage
Field Wiring (CXM board shown)
Capacitor
CB
Transformer
Low Water Temperature Cutout - FP1
The CXM control allows the field selection of source fluid
low temperature cutout points. The factory setting of FP1 is
set for water (30°F). In cold temperature applications jumper
JW3 (FP1- antifreeze 10°F) should be clipped as shown in
Figure 8 to change the setting to 10°F, a more suitable tem-
perature when using antifreezes. It should be noted that the
extended range option should be specified to operate the
HWW Series at entering water temperatures below 60°F.
WATER-TO-WATER (HWW) SERIES
Contactor -CC
L2
L1
CXM Control
Low Voltage
Connector
Low Voltage
Wiring
Rev.: 01/21/09B
Contactor -CC1
Contactor -CC2
Figure 7b: HWW120 Low Voltage Field
Wiring (CXM board shown)
Figure 8: Changing FP1-Low Water
Temperature Cutout Setpoint
L1 L2 L3
Grnd
Power Distribution
Block
17
Heat Controller, Inc.
Contactor -CC1
Grnd
Power Distribution
Contactor -CC2
Transformer
CXM Control #1
Low Voltage
Wiring
Low Voltage
Connector
CXM Control #2
Low Voltage
Connector
Second Stage Call
(Not needed on DXM Models
all low voltage wires to DXM #1)
Rev .: 01/22/09B
CXM Board
L1 L2 L3
Block
JW3-FP1 jumper
should be clipped
when antifreeze
is used.