Comfort-Aire HWW120 - Manual (Page 18)

17
Installation & Operation WATER-TO-WATER (HWW) SERIES Heat Controller, Inc.
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.
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.
Figure 7a. HWW036-060 Low Voltage
Field Wiring (CXM board shown)
Figure 7b: HWW120 Low Voltage Field
Wiring (CXM board shown)
Figure 8: Changing FP1-Low Water
Temperature Cutout Setpoint
JW3-FP1 jumper
should be clipped
when antifreeze
is used.
CXM Board
Capacitor
Transformer
CXM Control
Contactor -CC
Low Voltage
Connector
CB
L2
L1
Rev.: 01/21/09B
Low Voltage
Wiring
Contactor -CC1
Transformer
Grnd
L2 L3 L1
Contactor -CC2
CXM Control #2
Power Distribution
Block
CXM Control #1
Rev .: 01/22/09B
Low Voltage
Wiring
Second Stage Call
(Not needed on DXM Models
all low voltage wires to DXM #1)
Low Voltage
Connector
Low Voltage
Connector
Capacitor
Transformer
CXM Control
Contactor -CC
Low Voltage
Connector
CB
L2
L1
Rev.: 01/21/09B
Low Voltage
Wiring
Contactor -CC1
Transformer
Grnd
L2 L3 L1
Contactor -CC2
CXM Control #2
Power Distribution
Block
CXM Control #1
Rev .: 01/22/09B
Low Voltage
Wiring
Second Stage Call
(Not needed on DXM Models
all low voltage wires to DXM #1)
Low Voltage
Connector
Low Voltage
Connector