Electrical-Power Supply Wiring - Bosch CL Series Installation, Operation And Maintenance Manual

Loop static pressure will fluctuate with the seasons. Pressures
will be higher in the winter months than during the warmer
months. this fluctuation is normal and should be considered
when charging the system initially. Run the unit in either heating
or cooling for several minutes to condition the loop to a
homogeneous temperature.
When complete, perform a final flush and pressurize the loop to a
static pressure of 40 to 50 psig for winter months or 15 to 20
psig for summer months.
After pressurization, be sure to remove the plug from the end of
the loop pump motor to allow trapped air to be discharged and to
ensure the motor housing has been flooded. Be sure the loop flow
center provides adequate flow through the unit by checking
pressure drop across the heat exchanger.
5.8.3 Antifreeze
In areas where entering loop temperatures drop below 40°F or
where piping will be routed through areas subject to freezing,
antifreeze is needed. Alcohols and glycols are commonly used as
antifreeze agents. Freeze protection must be maintained to 15°F
below the lowest expected entering loop temperature. For
example, if the lowest expected entering loop temperature is
30°F, the leaving loop temperature would be 22°F to 25°F.
Therefore, the freeze protection must be at 15°F
(30°F-15°F=15°F).
5.9 Electrical—Power Supply Wiring
5.9.1 High-Voltage Wiring
DANGER
Electric Shock!
The system contains an oversize, protective, earthing
(grounding) terminal that must be properly connected
otherwise personal injury or death may result.
WARNING
Field wiring must be installed by qualified and trained
personnel.
WARNING
Power to the unit must be within the operating voltage range
indicated on the unit's nameplate or on the performance data
sheet.
CL Series Heat Pumps — 8733838716 (2024/05)
NOTICE
All field-installed wiring must comply with the National
Electric Code as well as all applicable local codes.
NOTICE
Properly-sized fusible safety switches or HACR circuit
breakers must be installed for branch circuit protection. See
the unit nameplate for maximum fuse or breaker size.
NOTICE
Operation of unit on improper line voltage or with excessive
phase imbalance will be hazardous to the unit, constitutes
abuse and may void the warranty.
NOTICE
All high-voltage connections must be torqued as specified by
the component's manufacturer.
Refer to the unit's electrical data on the unit's nameplate for wire
and branch circuit protection sizing. Supply power voltage and
phasing must match the required voltage and phasing shown on
the unit's nameplate. Operating the unit below the minimum
voltage, above the maximum voltage. or with incorrect phasing
can result in poor system performance or damage to the heat
pump. All field wiring must be installed by qualified and trained
personnel. Refer to the unit's wiring diagram for field connection
requirements.
The Electrical Box is designed to swing out of the way allowing for
improved access and servicing of the unit. To ensure proper
swing functionality, it is essential to provide sufficient wire
length. This can be achieved by using flexible conduit installed in
the unit (See Fig. 13) to guide the wire length determination.
Adequate wire length is required to enable full extension or
opening of the control box, up to 90 degrees.
Unit Installation
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