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5 SERIES 502W12 INSTALLATION MANUAL
Field Connected Water Piping cont.
Open Loop Well Water Systems
Installation of an open loop system is not recommended
unless water quality guidelines are met.
Earth Coupled Systems
All supply and return water piping should be insulated to
prevent excess condensation from forming on the water
lines. Ensure pumping system is capable of providing
adequate flow rate at the system pressure drop, 25 gpm
[1.58 L/s] (source side) is recommended. Antifreeze in the
loop is strongly recommended.
Heating with High Source Temperatures
Heating water with a water to water unit using high source
temperatures can lead to operating conditions that fall
outside of the system operating range. The condition
occurs when the loop (source) temperature exceeds 70°F
[21.1°C] with a full flow of 25 gpm [1.58 L/s]. Under this
scenario, the evaporating temperature can fall outside of
the compressor operating window.
To allow the system to operate correctly, restricting the
source side flow when the evaporating temperature
exceeds 55°F [12.7°C] is recommended. One way of
accomplishing this is to use a flow-restricting valve on the
source loop circuit that is controlled by the evaporating
temperature. Locate the sensing device on the refrigerant
inlet of the evaporator. In dual circuit systems, the company
recommends monitoring both circuits and controlling off
the sensor that reads the highest temperature.
As an alternative to the evaporating temperature, the
suction line temperature can be monitored with the same
control capability. In this control, temperature should be a
maximum of 65°F [18.3°C].
A kit is available for this application, contact WaterFurnace
for support.
Open Loop Well Water Systems
NHW
Well Tank
Solenoid
Valve
Ball Valve
Boiler Drain
Y-strainer
PT Ports
Earth Coupled Systems
NHW
Flow
Center
PT Ports
Y-strainer
Summary of Contents for 502W12
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