R e s i d e n t i a l Tr a n q u i l i t y
®
2 7 S p l i t ( T T S ) - 6 0 H z H F C - 4 1 0 A
R e v. : 8 M a y, 2 0 1 4 C
c l i m a t e m a s t e r. c o m
29
LT1
LT2
Figure 23: FP1 Limit Setting
CXM PCB
JW3-FP1 jumper
should be clipped
for low temperature
operation
Electrical - Low Voltage Wiring
Figure 24: Accessory Wiring
Water Solenoid Valves
An external solenoid valve(s) should be used on ground
water installations to shut o
ff
fl
ow to the unit when the
compressor is not operating. A slow closing valve may be
required to help reduce water hammer. Figure 24 shows
typical wiring for a 24VAC external solenoid valve. Figures
25 and 26 illustrate typical slow closing water control valve
wiring for Taco 500 series (P/N AVM…) and Taco SBV series
valves. Slow closing valves take approximately 60 seconds
to open (very little water will
fl
ow before 45 seconds). Once
fully open, an end switch allows the compressor to be
energized. Only relay or triac based electronic thermostats
should be used with slow closing valves. When wired as
shown, the slow closing valve will operate properly with the
following notations:
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.
Note: This valve can overheat the anticipator of an
electromechanical thermostat. Therefore, only relay or triac
based thermostats should be used.
Two-stage Units
Two-stage units should be designed with two parallel valves
for ground water applications to limit water use during
fi
rst
stage operation. For example, at 1.5 gpm/ton [2.0 l/m per
kW], a model 049 unit requires 6 gpm [23 l/m] for full load
(2nd stage) operation, but only 4 gpm [15 l/m] during 1st
stage operation. Since the unit will operate on
fi
rst stage 80-
90% of the time, signi
fi
cant water savings can be realized by
using two parallel solenoid valves with two
fl
ow regulators.
In the example above, stage one solenoid would be installed
with a 4 gpm [15 l/m]
fl
ow regulator on the outlet, while stage
two would utilize a 2 gpm [8 l/m]
fl
ow regulator. When stage
one is operating, the second solenoid valve will be closed.
When stage two is operating, both valves will be open,
allowing full load
fl
ow rate.
Figure 27 illustrates piping for two-stage solenoid valves.
Review
fi
gures 24-26 for wiring of stage one valve. Stage
two valve should be wired between “Y2” (compressor
solenoid -- wire nut connection) and terminal “C.”
NOTE:
When EWT is below 50°F [10°C], a minimum of 2 gpm per
ton (2.6 l/m per kW) is required.
Figure 25: AMV Valve Wiring
C
C
Thermostat
Y1
1
2
3
Y1
AVM
Taco Valve
Heater Switch
Figure 26: Taco SBV Valve Wiring
Accessory Connections
A terminal paralleling the compressor contactor coil has been
provided on the CXM control. Terminal “A” is designed to
control accessory devices, such as water valves. Note: This
terminal should be used only with 24 Volt signals and not
line voltage. Terminal “A” is energized with the compressor
contactor. See Figure 24 or the specifi c unit wiring diagram
for details.
