Open Loop Or Ground-Water - ClimateMaster Tranquility 30 Digital TE Series Installation, Operation & Maintenance Instructions Manual

Figure 20: Typical Open Loop/Well Application
⚠
CAUTION!
CAUTION! Refrigerant pressure activated water regulating
valves should never be used with this equipment.
Tranquility packaged units are available with a water circuit
®
option for open loop applications (designated by a 6 in the
11th position of the unit model number).
The Motorized Modulating Valve is regulated by the
Communicating DXM2 board based on entering and leaving
water temperature (ΔT). The DXM2 board gives a 0-10v
signal to determine flow rate. The motorized modulating
valve defaults to closed position if it loses signal but still has
24V power running to it. If the motorized modulating valve
loses both signal from the DXM2 board AND 24V power,
it will remain in the same position it was in when it lost
24V power. DO NOT USE open loop units in closed loop
applications due to significant pressure drop through the
open loop motorized modulating valve. This option is only
available with Cupro-Nickel Water Coil.
To manually open the internal modulating motorized water
valve in TE026 – 049 push down on the handle to unlock
it. Then rotate the handle to the open position as shown
in Figure 19. This fully opens the valve for flushing. Once
flushing is complete, return the valve handle to its normally
closed position.
To manually open the internal modulating motorized water
valve in TE064–072, push down on the lock release button
while turning the handle to the open position as shown in
Figure 19. This fully opens the valve for flushing. Once
flushing is complete, press the lock release again and return
the valve handle to its normally closed position.
Tranquility
®
Open Loop or Ground-Water Heat Pump Applications
Pressure
Tank
Internal Motorized
Water Out
Modulating Valve
Shut Off
Ball Valves
Boiler
Drains for Isolation
Optional
Filter
⚠
c l i m a t e m a s t e r . c o m
30 Digital ( TE) Series IOM - 60Hz HFC-410A
Open Loop - Ground Water Systems
Typical open loop piping is shown in Figure 20. Shut off
valves should be included for ease of servicing. Boiler drains
or other valves should be "tee'd" into the lines to allow acid
flushing of the heat exchanger. Shut off valves should be
positioned to allow flow through the coax via the boiler drains
without allowing flow into the piping system. Schrader ports
built into unit may be used to measure heat exchanger
pressure drop. Water temperature can be viewed on the
communicating thermostat. Supply and return water piping
should be limited to copper, HPDE, or other acceptable high
temperature material. Note that PVC or CPVC material is not
recommended as they are not compatible with the polyolester
oil used in HFC-410A products.
Water In
Water quantity should be plentiful and of good quality. Consult
Table 5 for water quality requirements. vFlow
loop applications always come with Cupro-Nickel coils. In
ground water situations where scaling could be heavy or
where biological growth such as iron bacteria will be present,
an open loop system is not recommended. Heat exchanger
coils may over time lose heat exchange capabilities due to
build up of mineral deposits. Heat exchangers must only
be serviced by a qualified technician, as acid and special
pumping equipment is required. Desuperheater coils can
likewise become scaled and possibly plugged. In areas with
extremely hard water, the owner should be informed that
the heat exchanger may require occasional acid flushing.
In some cases, the desuperheater option should not be
recommended due to hard water conditions and additional
maintenance required.
Water Quality Standards
Table 5 should be consulted for water quality requirements.
Scaling potential should be assessed using the pH/Calcium
hardness method. If the pH <7.5 and the Calcium hardness
is less than 100 ppm, scaling potential is low. If this method
yields numbers out of range of those listed, a monitoring plan
should be implemented in these probable scaling situations.
Other water quality issues such as iron fouling, corrosion
prevention and erosion and clogging should be referenced in
Table 5.
R e v . : O c t o b e r 5 , 2 0 2 1
units for open
™
23