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
Tranquility
®
Water-to-Water (TMW) Series
R e v. : 0 4 / 1 5 / 1 6
11
c l i m a t e m a s t e r. c o m
Water-Loop Heat Pump Applications
Commercial systems typically include a number of units
plumbed to a common piping system. Any unit plumbing
maintenance work can introduce air into the piping system,
therefore air elimination equipment is a major portion
of the mechanical room plumbing. In piping systems
expected to utilize water temperatures below 50°F [10°C],
1/2" [13mm] closed cell insulation is required on all piping
surfaces to eliminate condensation. Metal to plastic
threaded joints should never be employed due to their
tendency to leak over time. Tefl on tape thread sealant is
recommended for FPT water connections (commercial
class) to minimize internal fouling of the heat exchanger.
Do not overtighten connections and route piping so as not
to interfere with service or maintenance access. Hose kits
are available from ClimateMaster in different confi gurations
as shown in Figure 2 for connection between the TMW
Series and the piping system. The hose kits include shut
off valves, P/T plugs for performance measurement, high
pressure stainless steel braid hose, "Y" type strainer 20
mesh (841 micron) [0.84mm]) with blowdown valve, and
"J" type swivel connection. Balancing valves to facilitate
the balancing of the system, and an external low pressure
drop solenoid valve for use in variable speed pumping
systems, may also be included in the hose kit. The piping
system should be fl ushed to remove dirt, piping chips,
and other foreign material prior to operation. See Piping
System Cleaning and Flushing Procedures later in this
document. The fl ow rate is usually set between 2.25
gpm and 3 gpm per ton [2.9 l/m and 4.5 l/m per kW] of
cooling capacity. ClimateMaster recommends 2.5 gpm
Air Pad or
Extruded
polystyrene
insulation board
Unit Power
Disconnect
Pressure
Tank
Flow
Regulator
Water
Control
Valve
P/T Plugs
Water Out
Shut-Off
Valve
Boiler
Drains
Water In
Optional
Filter
Thermostat Wiring
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.
per ton [3.2 l/m per kW] for most applications of water
loop heat pumps. To insure proper maintenance and
servicing, P/T ports are imperative for temperature and
fl ow verifi cation, as well as performance checks.
Cooling Tower/Boiler Systems typically utilize a
common loop maintained 60-90°F [16-32°C]. The use of a
closed circuit evaporative cooling tower with a secondary
heat exchanger between the tower and the water loop
is recommended. If an open type cooling tower is used
continuously, chemical treatment and fi ltering will be
necessary.
Low Water Temperature Cutout Setting - CXM or DXM
Control: When an antifreeze is selected, the LT1 jumper
(JW3) should be clipped to select the low temperature
(Antifreeze 15°F [-9.4°C]) setpoint to avoid nuisance faults.
See Figure 4: Low Water Temperature Cutout - LT1.
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.
Figure 3: Typical Open Loop/Well Application
