THE SMART SOLUTION FOR ENERGY EFFICIENCY
Tranquility
®
Water-to-Water (TMW) Series
Rev.: 04/15/16
15
climatemaster.com
WARNING!
CAUTION!
CAUTION! Many units are installed with a factory or fi eld
supplied manual or electric shut-off valve. DAMAGE WILL
OCCUR if shut-off valve is closed during unit operation. A
high pressure switch must be installed on the heat pump side
of any fi eld provided shut-off valves and connected to the
heat pump controls in series with the built-in refrigerant circuit
high pressure switch to disable compressor operation if water
pressure exceeds pressure switch setting. The fi eld installed
high pressure switch shall have a cut-out pressure of 300
psig and a cut-in pressure of 250 psig. This pressure switch
can be ordered from ClimateMaster with a 1/4” internal fl are
connection as part number 39B0005N02.
WARNING! Never jumper terminal “A” from CXM or DXM
board #1 to CXM or DXM board #2 on multi-compressor/
control bound units. See Figure 5 in electrical section of this
document for motorized valve wiring.
ELECTRICAL LINE VOLTAGE
All fi eld installed wiring, including electrical ground, must
comply with the National Electrical Code as well as all
applicable local codes.
Refer to the unit wiring diagrams for fuse sizes and a
schematic of the fi eld connections which must be made by
the installing (or electrical) contractor.
Consult the unit wiring diagram located on the inside of
the compressor access panel to ensure proper electrical
hookup.
All fi nal electrical connections must be made
with a length of fl exible conduit to minimize vibration and
sound transmission to the building.
General Line Voltage Wiring -
Be sure the available
power is the same voltage and phase as that shown on the
unit serial plate. Line and low voltage wiring must be done
in accordance with local codes or the National Electric
Code, whichever is applicable.
TMW Power Connection - Line voltage connection is
made by connecting the incoming line voltage wires
to L1, L2, and L3 on power distribution block. Consult
electrical data table for correct fuse size.
208 Volt Operation -
All 208-230 Volt units are factory
wired for 208 Volt. The transformers may be switched to
230V operation as illustrated on the wiring diagram by
switching the Red (208V) and the Orange (230V) at the
contactor terminal L2.
WARNING!
WARNING! To avoid possible injury or death due to electrical
shock, open the power supply disconnect switch and secure
it in an open position during installation.
CAUTION!
CAUTION! Use only copper conductors for fi eld installed
electrical wiring. Unit terminals are not designed to accept
other types of conductors.
WARNING!
WARNING! Disconnect electrical power source to prevent
injury or death from electrical shock.
Water Control Valve -
Note the placement of the water
control valve. Always maintain water pressure in the heat
exchanger by installing water control valves at the source
out of the unit to prevent mineral precipitation. Position
water high pressure switch between unit and valve. Pilot
operated or slow closing valves are recommended to
reduce water hammer. If water hammer persists, a mini-
expansion tank can be mounted on the piping to help
absorb the excess hammer shock. Insure that the total ‘VA’
draw of the valve can be supplied by the unit transformer.
For instance, some slow closing valves can draw up to
35VA. This can overload smaller transformers depending
on the other controls employed. A typical pilot operated
solenoid valve draws approximate
ly 15VA.
Flow Regulation -
Install on source in of unit. Flow
regulation can be accomplished by two methods. First,
most water control valves have a built in fl ow adjustment.
By measuring the pressure drop through the unit heat
exchanger, fl ow rate can be determined and compared
to Table 6. Since the pressure is constantly varying, two
pressure gauges might be needed. Simply adjust the water
control valve until the desired fl ow of 2.5 to 3 gpm per ton
[2.0 to 2.6 l/m per kW] is achieved. Secondly, a fl ow control
device may be installed. The devices are typically an orifi ce
of plastic material that is designed to allow a specifi ed fl ow
rate. These are mounted on the outlet of the water control
valve. On occasion, these valves can produce a velocity
noise that can be reduced by applying some back pressure.
This is accomplished by slightly closing the leaving isolation
valve of the well water setup.
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