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Earth Coupled Systems - Bosch EP015 Installation And Maintenance Manual

Ep series
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20 EP Series
water loop. A cooling tower provides evaporative
cooling to the loop water thus maintaining a constant
supply temperature to the unit. When utilizing open
cooling towers, chemical water treatment is mandatory
to ensure the water is free from corrosive elements.
A secondary heat exchanger (plate frame) between
the unit and the open cooling tower may also be
used. It is imperative that all air be eliminated from
the closed loop side of the heat exchanger to insure
against fouling.
In the heating mode, heat is absorbed from the water
loop. A boiler can be utilized to maintain the loop at
the desired temperature.
Water piping exposed to extreme low ambient
temperatures is subject to freezing.
Pressure/temperature ports are recommended in both
supply and return lines for system flow balancing. Water
flow can be accurately set by measuring the water-to-
refrigerant heat exchangers water side pressure drop. See
specification sheets for water flow vs. pressure drop
information in the back of this manual.


Closed loop and pond applications require
specialized design knowledge. No attempt at these
installations should be made unless the dealer has
received specialized training. Utilizing FHP's Ground
Loop Pumping Package (GLP), makes the installation
easy. Anti-freeze solutions are utilized when low
operating conditions are expected to occur. Refer to
the GLP installation manuals for more specific
instructions. A wrapped water coil option is required
for this application.
System Checkout
After completing the installation, and before
energizing the unit, the following system checks
should be made prior to initial startup:
• Verify that the supply voltage to the heat pump is in
accordance with the nameplate ratings
• Make sure that all electrical connections are tight
and secure
• Check the electrical fusing and wiring for the
correct size
• Verify that the low voltage wiring between the
thermostat and the unit is correct
• Verify that the water piping is complete and correct
• Check that the water flow is correct, and adjust if
• Check the blower for free rotation, and that it is
secured to the shaft
• Verify that vibration isolation has been provided
• Unit is serviceable. Be certain that all access panels
are secured in place
• Verify that the blower support has been removed
• Verify that duct work has been properly fastened to
supply and return duct collars
• Make sure return air filters are positioned correctly in
the filter rack if removed during installation
1. Set the thermostat to the highest setting.
2. Set the thermostat system switch to "COOL ", and
the fan switch to the "AUTO" position. The
reversing valve solenoid should energize. The
compressor and fan should not run.
3. Reduce the thermostat setting to approximately 5
degrees below the room temperature.
4. Verify the heat pump is operating in the cool mode.
5. Turn the thermostat system switch to the "OFF"
position. The unit should stop running and the
reversing valve should de-energized
6. Leave the unit off for approximately (5) minutes to
allow for system equalization.
7. Turn the thermostat to the lowest setting. The
compressor and fan should not run.
8. Set the thermostat switch to "HEAT".
9. Increase the thermostat setting approximately 5
degrees above the room temperature.
10. Verify the heat pump is operating in the
heating mode.
11. Set the thermostat to maintain the desired space
12. Check for vibrations, leaks, etc...
Subject to change without prior notice
Water Piping
Revised 12-13

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