T H E S M A R T S O L U T I O N F O R E N E R G Y E F F I C I E N C Y
15
c l i m a t e m a s t e r. c o m
Tr a n q u i l i t y
®
W a t e r- t o - W a t e r T H W S e r i e s
R e v i s e d : 0 2 J a n u a r y, 2 0 1 3
Figure 7: Accessory Wiring
Figure 6: Changing FP1-Low Water Temperature
Cutout Setpoint
JW3-FP1 jumper
should be clipped
when antifreeze
is used.
CXM Board
1. The valve will remain open during a unit lockout.
2. The valve will draw approximately 25-35 VA through the
“Y” signal of the thermostat.
Electrical - Low Voltage
"A" has been provided to control accessory
devices, such as water valves, electronic air cleaners,
humidifi ers, etc.
Note: This terminal should be
used only with 24 Volt signals and not line voltage
signals.
This signal operates with the compressor
contactor. See Figure 7 or the wiring schematic for
details.
Low Voltage Connections
The thermistors (sensors) and other low voltage wiring
should be connected to the 12 position terminal strip
in the THW control box. See fi gure 4 and unit wiring
diagram for details.
Low Water Temperature Cutout - FP1
The CXM/DXM control allows the fi eld selection of
source fl uid low temperature cutout points. The factory
setting of FP1 is set for water -1.1°C. In cold temperature
applications jumper JW3 (FP1- antifreeze -12.2°C) should
be clipped as shown in Figure 6 to change the setting
to -12.2°C, a more suitable temperature when using
antifreezes.
Accessory Connections
A terminal paralleling the compressor contactor coil
has been provided on the CXM/DXM control of the
THW unit.
Water Solenoid Valves
Figures 8 and 9 illustrate a typical slow closing water
control valve wiring. A slow closing valve may be
required to prevent water hammer. When using an
AVMB -Taco Slow Closing valves on THW Series
equipment Figure 9a wiring should be utilized. The
valve takes approximately 60 seconds to open (very
little water will fl ow before 45 seconds) and it activates
the compressor only after the valve is completely
opened (by closing its end switch). Only relay or triac
based electronic thermostats should be used with
the AVMB valve. When wired as shown, the valve will
operate properly with the following notations:
