Heat Controller HTS SERIES manual Ground-Water Heat Pump Applications, Sizes 064, Closed, Open

T h e Q u a l i t y L e a d e r i n C o n d i t i o n i n g A i r

R e s i d e n t i a l S p l i t - 6 0 H z R 4 1 0 A

R e v. : 0 3 A u g u s t , 2 0 1 2

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!

CAUTION! Refrigerant pressure activated water regulating valves should never be used with HCI equipment.

Figure 9: Water Well Connections

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 flushing. Once flushing 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 flushing. Once flushing is complete, press the lock release again and return the valve handle to its normally closed position.

Figure 9a: Optional Modulating Motorized Valve Positions

			Sizes024 - 048	Sizes 060
	Flow		026-049	Sizes 064- 72
Water			Closed	Closed
	Regulator	Pressure
Control
Valve		Tank
		Water Out	Water In
				/RFN5HOHDVH
		Shut-Off	Open	Open
		Valve
		Optional
		Filter
	Boiler
P/T Plugs	Drains

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 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.

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