23
c l i m a t e m a s t e r.c o m
Tranquility
®
22 Digital (TZ
)
Series - 60Hz
R e v. : N o v e m b e r 1 8 , 2 0 2 2
Internal Motorized
Modulating Valve
Water Out
Shut Off
Ball Valves
for Isolation
Water In
Pressure
Tank
Optional
Filter
Boiler
Drains
Open Loop or Ground-Water Heat Pump Applications
Figure 19: Typical Open Loop/Well Application
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 DXM2.5 board based on entering and
leaving water temperature (ΔT). The DXM2.5 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 DXM2.5 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 TZ024 – 060 push down on the handle to unlock
it. Then rotate the handle to the open position as shown
in Figure 18. This fully opens the valve for flushing. Once
flushing is complete, return the valve handle to its normally
closed position.
OPEN LOOP – GROUND WATER SYSTEMS
Typical open loop piping is shown in Figure 19. 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 quantity should be plentiful and of good quality.
Consult Table 4 for water quality requirements. vFlow
®
units for open 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 REQUIREMENTS
Table 4 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 4.
⚠
CAUTION!
⚠
CAUTION!
Refrigerant pressure activated water regulating
valves should never be used with this equipment.