ClimateMaster DC Series Installation Manual download pdf (Page 14)

Residential H&V - 60Hz R22 &R410A

Rev.: 22 Dec, 2008

Water-Source Heating and Cooling Systems

Air Pad or

Extruded

polystyrene

insulation board

Unit Power

Disconnect

Thermostat

Wiring

Pressure

Tank

Shut-Off

Valve

Boiler

Drains

Flow

Regulator

Water In

Water Out

Water

Control

Valve

Optional

Filter

P/T Plugs

Figure 13: Typical Open Loop/Well Application

Ground-Water Heat Pump Applications

applications should be considered for the inherent energy

savings and smaller expansion tank requirements.

Water Control Valve

Note the placement of the water control valve in ﬁ gure 13.

Always maintain water pressure in the heat exchanger by

placing the water control valve(s) on the discharge line

to prevent mineral precipitation during the off-cycle. Pilot

operated slow closing valves are recommended to reduce

water hammer. If water hammer persists, a mini-expansion

tank can be mounted on the piping to help absorb the excess

hammer shock. Insure that the total ‘VA’ draw of the valve

can be supplied by the unit transformer. For instance, a slow

closing valve can draw up to 35VA. This can overload smaller

40 or 50 VA transformers depending on the other controls

in the circuit. A typical pilot operated solenoid valve draws

approximately 15VA (see Figure 20). Note the special wiring

diagrams for slow closing valves (Figures 23 & 25).

Flow Regulation

Flow regulation can be accomplished by two methods. One

method of ﬂ ow regulation involves simply adjusting the ball

valve or water control valve on the discharge line. Measure the

pressure drop through the unit heat exchanger, and determine

ﬂ ow rate from tables 8a through 8c. Since the pressure is

constantly varying, two pressure gauges may be needed.

Adjust the valve until the desired ﬂ ow of 1.5 to 2 gpm per ton

[2.0 to 2.6 l/m per kW] is achieved. A second method of ﬂ ow

control requires a ﬂ ow control device mounted on the outlet of

the water control valve. The device is typically a brass ﬁ tting

with an oriﬁ ce of rubber or plastic material that is designed

to allow a speciﬁ ed ﬂ ow rate. On occasion, ﬂ ow control

devices may produce velocity noise that can be reduced by

applying some back pressure from the ball valve located on

the discharge line. Slightly closing the valve will spread the

pressure drop over both devices, lessening the velocity noise.

NOTE: When EWT is below 50°F [10°C], a minimum of 2

gpm per ton (2.6 l/m per kW) is required.

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 ClimateMaster equipment.

 CAUTION! 

CAUTION! Units with ClimaDry Modulating Reheat option

installed in an open loop (well water) application require an

internal bronze pump. The cupro-nickel heat exchanger

option (which includes a bronze pump) must be used

for these applications. Failure to select this option could

result in premature equipment failure. ClimaDry is not

recommended for applications with poor water quality (see

water quality guidelines). The copper heat exchanger with

cast iron pump (standard ClimaDry option) is designed for

closed loop systems.

 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.

Section 10 - Packaged IOM 14 4/24/09 3:16:50 PM

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ClimateMaster DC Series Installation Manual Page 14

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