Tranquility THW - 50 & 60Hz R410A - ClimateMaster Geothermal Heat Pumps - Rev.: 30 June, 2008B
14
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 figures 5 and 6 for details.
Accessory Connections
A terminal paralleling the compressor contactor coil has
been provided on the CXM/DXM control of the THW unit.
"A" has been provided to control accessory devices,
such as water valves, electronic air cleaners, humidifiers,
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 8 or
the wiring schematic for details.
Figure 8: Accessory Wiring
Water Solenoid Valves
Figures 9a and 9b 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 flow 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:
Low Water Temperature Cutout - FP1
The CXM/DXM control allows the field selection of source
fluid low temperature cutout points. The factory setting of
FP1 is set for water (30°F [-1.1°C]). In cold temperature
applications jumper JW3 (FP1- antifreeze 10°F [-12.2°C])
should be clipped as shown in Figure 7 to change the
setting to 10°F [-12.2°C], a more suitable temperature when
using antifreezes.
Figure 7: Changing FP1-Low Water
Temperature Cutout Setpoint
ELECTRICAL - LOW VOLTAgE
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.
CXM
Board
JW3-FP1 jumper
should be clipped
when antifreeze
is used.
