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Connecting a Water
Regulating Valve
Note: Water regulating valves are
most commonly applied with
vapor-cycle refrigeration
systems that use capillary
tube metering devices to
maintain suitable head or
suction pressure levels for
proper compressor loading.
They are seldom applied
when thermal expansion
valves (TXV's) are used.
The water regulating valve assembly
is shipped as a separate item.
Connections from the valve
assembly to the unit must be made
by the installing contractor.
Note: IMPORTANT! These valves
are not positive shut-off
devices. Use a slow-closing
solenoid valve in the heat
pump's leaving water line to
assure positive shut-off in
variable-pumping
applications.
Installation for Single
Compressor Units
1.
Connect the MPT connection on
the valve assembly to the unit
water out FPT connection. Note:
A field supplied union or elbow
may be required to connect the
water regulating valve assembly
to the unit. All field supplied
fittings should be brass or
copper.
2.
Connect the valve depressor
with a 1/4" (6.35 mm) flare nut to
the 1/4" (6.35 mm) schrader tap
on the unit.
Note: The pressure-sensing lines
from both regulators have
been "tee'd" together.
3.
Adjust the regulator head
pressure to meet specified
conditions. See
Table
Table 32.
Typical water regulating valve
operating pressures
Discharge
Pressure
Water Temp
Cooling
Entering
Cycle 80F
WSHP Unit
Return Air
45 F
160 psig
(minimum)
54
Installation
Table 32.
Typical water regulating valve
operating pressures
50 F
55 F
60 F
65 F
Note: If the unit has not been
ordered with a water
regulating tap, and the tap is
field installed, it is important
the tap be made on the
copper tube between the
reversing valve and the
water-to-refrigerant heat
exchanger. This is the only
part of the heat pump
refrigerant circuit that serves
as both a discharge line
during the cooling cycle, and
a suction line during the
heating cycle. To avoid
shavings, particles and dirt
from entering the system, it is
recommended that the 1/4"
(6.35 mm) hole be burned in
the copper vs. drilled in the
copper.
FIELD SUPPLIED
UNION REQUIRED
TO CONNECT WATER
REGULATING ASSEMBLY
TO WATER-OUT CONNECTION
DIRECT
REVERSE
ACTING
ACTING
VALVE
VALVE
VALVE ADJUSTMENT
KNOBS
32.
Figure 59.
Suction
Pressure
Heating
Installation for Multiple
Cycle 70F
Return-Air
Compressor Units
46-54 psig
A water regulating schrader option is
not available factory shipped on the
160 psig
52-60 psig
(minimum)
160 psig
56-66 psig
(minimum)
166-190 psig
60-72 psig
178-204 psig
62-74 psig
TOP VIEW
FRONT VIEW
RIGHT VIEW
TO THE UNIT 'S
1/4" (6.35) SCHRADER
VALVE DEPRESSOR
VALVE TAP
W/ 1/4" (6.35) FLARE NUT
WRV assembly
12 1/2 through 25 ton units. All
preparations for the acceptance of a
water regulating valve assembly
must be made in the field.
Field Installed Power
Wiring
Power wiring to the equipment must
conform to National and Local
Electric Codes (NEC) by a
professional electrician.
WARNING
Live Electrical Components!
During installation, testing, servicing
and troubleshooting of this product,
it may be necessary to work with live
electrical components. Have a
qualified licensed electrician or other
individual who has been properly
trained in handling live electrical
components perform these tasks.
Failure to follow all electrical safety
precautions when exposed to live
electrical components could result in
death or serious injury.
Verify that the power supply
available is compatible with the unit's
nameplate. Use only copper
conductors to connect the power
supply to the unit.
CAUTION
Use Copper Conductors Only!
Unit terminals are not designed to
accept other types of conductors.
Failure to use copper conductors
may result in equipment damage.
Main Unit Power Wiring
WARNING!
Grounding Required!
Follow proper local and state
electrical code on requirements for
grounding. Failure to follow code
could result in death or serious
injury.
A field supplied disconnect switch
must be installed at or near the unit
in accordance with the National
Electric Code (NEC latest edition).
Location of the applicable electric
service entrance for HIGH (line
voltage) may be found in the
Dimensions section of this manual.
The high voltage connection is made
at the 1K1 contactor or 1TB1 power
WSHP-SVX01E-EN
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