Installation, Operation, and Maintenance Manual
CA Series Heat Pumps -8733851021 (2025/04) US
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3 General Description
CA series water-to-air heat pumps are designed for use as decentralized room
terminals that are field connected to a closed-circuit piping loop within a structure.
Typically these units are installed in perimeter zones and are ideal for installations
where ducted systems are impractical. Safety devices are built into each unit
to provide the maximum system protection possible when properly installed
and maintained. All units are AHRI (Air-Conditioning, Heating, and Refrigeration
Institute) certified to AHRI/ANSI/ASHRAE/ISO standard 13256-1 for water-to-air
and brine-to-air heat pumps at Water Loop Heat Pump, Ground Loop Heat Pump,
and Ground Water Heat Pump application points. All CA Water-to-Air Heat Pumps
conform to UL 60335-2-40 and are certified by Intertek-ETL.
NOTICE
Product damage
NOTICE
!
CA units are designed and rated for conditioned space installation only.
3.1 Operating Limits
3.1.1 Environment
This equipment is designed for indoor installation only. Extreme variations in
temperature, humidity, and corrosive water or air will adversely affect the unit
performance, reliability and service life.
3.1.2 Power Supply
A voltage variation of ± 10% of nameplate utilization voltage is acceptable.
3.1.3 Unit Starting Conditions
Minimum ambient temperature for heating operation is 45°F. Minimum entering air
for heating is 40°F. Minimum entering water temperature for heating with standard
range units is 50°F and for extended range units is 20°F. Air and water flow rates
must be within the cataloged range.
Operating limits listed in the Unit Starting Conditions section are not suitable for
continuous operating conditions. Assume that such start-up conditions are for the
purpose of bringing the building space up to occupancy temperature.
3.1.4 Normal Operating Conditions
Normal operating conditions must fall in the limits defined in the table below.
(Refer to Table 1)
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