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Fluid differential Pressure switch
second heat pump or resistance heat should be
provided to handle the structural loss load.
A protective coating is highly recommended for all
pool applications due to the highly corrosive
chemical environment.
Fluid diFFereNtial Pressure
sWitcH (dPs)
The function of the differential switch is to prevent
or stop compressor operation should the water
supply fail. This will prevent the unit from locking
out on a safety requiring manual reset to restart.
The switch is piped between the water entering and
leaving connections. Should the pressure drop fall
below set value the switch will open de-energizing
the DPS relay thereby stopping the compressor.
The controller has an adjustment to change the
minimum pressure differential required to open the
switch and may require fi eld adjustment.
The blower operation will not be affected by this
option.
The start-up process should include checking the
operation of the switch when installed. This
should be done after the system is balanced.
Adjustment should be made if necessary.
operating Pressures and temperatures
Operating pressures and temperatures in the reheat
mode vary slightly from standard cooling mode operat-
ing characteristics. The variations are as follows:
Discharge Pressure: (-) 5 to 20 PSIG
Discharge Gas Temperature: (-) 5°F to 15°F
Suction Pressure: (+) 5 to 10 PSIG
Suction Gas Temperature: (+) 5°F to 10°F
Water PiPiNG
Water piping exposed to extreme low ambient
temperatures are subject to freezing.
Remember water freezes at 32°F.
Supply and return piping must be as large as the
water connections on the heat pump (larger on long
Revised 05-12
Caution
Caution
Subject to change without prior notice
runs). Never use fl exible hoses of a smaller inside
diameter than that of the water connections on the
unit. The heat pump units are supplied with either a
copper or optional cupro-nickel condenser.
Galvanized pipe or fi ttings are not
recommended for use with these units due to
the possible galvanic corrosion.
Both the supply and discharge water lines will sweat if
subject to low water temperature. These lines should
be insulated to prevent damage from condensation.
All manual fl ow valves used in the system must be
ball valves. Globe and gate valves must not be used
due to high pressure drop and poor throttling
characteristics.
Never exceed the recommended water fl ow rates.
Serious damage or erosion of the water to
refrigerant heat exchanger could occur.
Improper heat exchanger water fl ow due to
piping, valve arrangement or improper pump
operation is hazardous to the unit and
constitutes abuse which will void the heat
exchanger and compressor warranty.
All heat pump units are equipped with female pipe
thread fi ttings. Consult the specifi cation sheets for
sizes. Tefl on tape sealer should be used when
connecting water piping connections to the units to
ensure against leaks and possible heat exchanger
fouling. Do not over tighten the connections. Flexible
hoses should be used between the unit and the rigid
system to avoid possible vibration. Ball valves should
be installed in the supply and return lines for unit
isolation and unit water fl ow balancing.
No unit should be connected to the supply or return
piping until the water system has been completely
cleaned and fl ushed to remove any dirt, piping
chips or other foreign material. Supply and return
hoses should be connected together during this
process to ensure the entire system is properly
fl ushed. After the cleaning and fl ushing has taken
place the unit may be connected to the water loop
and should have all valves wide open.
Well Water systeMs
Copper is adequate for ground water that is not high
in mineral content. Should your well driller express
6 720 220 045
cP/BP series
13
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