Comfort-Aire HTS Series Split System,Two Stage, 2-5 Tons - Manual (Page 13)

Figure 9: Water Well Connections
Pressure
Tank
Shut-Off
Valve
Boiler
Drains
Flow
Regulator
Water In
Water Out
Water
Control
Valve
Optional
Filter
P/T Plugs
Optional Modulating Motorized Valve - For Open
Loop Applications
A low Cv modulating motorized valve is used for this
application to provide more precise control against the higher
system pressure differential of open loop applications.
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 fl ow 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 signifi cant pressure drop through the open loop motorized
modulating valve.
To manually open the internal modulating motorized water
valve in HTS024 - 048 push down on the handle to unlock
it. Then rotate the handle to the open position as shown
in Figure 9a. This fully opens the valve for fl ushing. Once
fl ushing is complete, return the valve handle to its normally
closed position.
To manually open the internal modulating motorized water
valve in HTS060, push down on the lock release button while
turning the handle to the open position as shown in Figure
9a. This fully opens the valve for fl ushing. Once fl ushing is
complete, press the lock release again and return the valve
handle to its normally closed position.
Figure 9a: Optional Modulating Motorized Valve Positions
/RFN5HOHDVH
Sizes 026-049 Sizes 064-072
Closed Closed
Open Open
Sizes 024 - 048 Sizes 060
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Installation, Operation & Maintenance HTS SERIES SPLIT SYSTEM Heat Controller, LLC
Ground-Water Heat Pump Applications
Water Coil Low Temperature Limit Setting
For all open loop systems the 30°F [-1.1°C] FP1 setting
(factory setting-water) should be used to avoid freeze
damage to the unit. See “Low Water Temperature Cutout
Selection” in this manual for details on the low limit setting.
CAUTION! Refrigerant pressure activated water regulating
valves should never be used with HCI equipment.
CAUTION!