General Description
3.1 Operating Limits
3.1.1 Environment
This equipment is designed for indoor installation only. Extreme
variations in tem
perature, 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
M
inimum ambient temperature for heating operation is 45°F.
Minimum enteri
ng 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. (Ref
er to Table 2.)
Table 2 Operating Limits
Operating Limits
Fluid Type Specification Cooling Heating
Air
Minimum ambient air temperature 50°F 40°F
Maximum ambient air temperature 100°F 85°F
Rated ambient air temperature 80°F 68°F
Minimum air coil entering air db/wb 65/57°F 45°F
Maximum air coil entering air db/wb 95/85°F 80°F
Rated air coil entering air db/wb 80/67°F 68/59°F
Liquid
Antifreeze Protection Required
— LWT <40°F
— EWT <50°F
Minimum water coil entering fluid temperature 45°F 20°F
Maximum water coil entering fluid temperature 110°F 80°F
Rated water coil entering fluid
temperature
Water Loop 86°F 68°F
Ground Loop 77°F 32°F
Ground Water 59°F 50°F
Maximum operating water pressure
Standard Unit 400 psi/2,785 kPa
With factory installed water valve
option
300 psi/2,068 k
Pa
Minimum operating water flow rate 1.5 GPM per ton
Note: Maximum and minimum operating limits may not be combined. Refer to Engineer Submittal Sheet on the product information
page. (See the QR code on the back page of the IOM).
Acronyms:
LWT: Leaving Water Temperature
EWT: Entering Water Temperature
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CL Series Heat Pumps — 8733838716 (2024/05)
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