IM 439 / Page 9 of 24
Operating Limits
Environment
This equipment is designed for indoor installation only. Shel-
tered locations such as attics, garages, etc., generally will
not provide sufficient protection against extremes in tem-
perature and/or humidity, and equipment performance, reli-
ability, and service life may be adversely affected.
➀ At ARI flow rate.
➁ Maximum and minimum values may not be combined. If one value is at
maximum or minimum, the other two conditions may not exceed the normal
condition for standard units. Extended range units may combine any two
maximum or minimum conditions, but not more than two, with all other
conditions being normal conditions.
Additional Information
1. All units
Unit will start up in an ambient of 40°F (5°C), with entering
air at 40°F (5°C), with entering water at 40°F (5°C), with
both air and water at flow rates used in the ARI Standard
320-86 rating test, for initial start-up in winter.
Note: This is not a normal or continuous operating
condition. It is assumed that such a start-up is for the
purpose of bringing the building space up to
occupancy temperature.
Electrical Data
General
1. Be sure the available power is the same voltage and phase
as that shown on the unit serial plate. Line and low voltage
wiring must be done in accordance with local codes or the
National Electrical Code, whichever is applicable.
2. Apply correct line voltage to the unit. Each unit is supplied
with a 3-lug terminal block in the main control for three-
phase main power. Multiple knockouts on the sides of the
unit facilitate conduit connections on the unit for line and
low voltage. A disconnect switch near the unit is required
by code. Power to the unit must be sized correctly and be
fused with Class RK5 dual element fuses.
Minimum and Maximum Voltage
Nameplate 208/60/3: Min. 187 volts, Max. 229 volts
Nameplate 230/60/3: Min. 207 volts, Max. 253 volts
Nameplate 460/60/3: Min. 414 volts, Max. 506 volts
Nameplate 575/60/3: Min. 515 volts, Max. 632 volts
Nameplate 380/50/3: Min. 360 volts, Max. 418 volts
Three-phase system unbalance should not exceed 2%.
Voltages listed are to show voltage range. However, units
operating with overvoltage and undervoltage for extended
periods of time will experience premature component failure.
All UNITS
Cooling Heating
Table 1. Air and water limits
Min. Ambient Air 40°F/5°C40°F/5°C
Normal Ambient Air 80°F/27°C70°F/21°C
Max. Ambient Air 100°F/38°C85°F/29°C
Min. Ent. Air
➀➁
50°F/10°C40°F/5°C
Normal Ent. Air, 80/67°F70°F
db/wb 27/19°C21°C
Max. Ent. Air, 100/83°F80°F
db/wb
➀➁
38/28°C27°C
Table 2. Water enthalpy
Cooling Heating Cooling Heating
Min. Ent. Air
➀➁
55°F/13°C55°F/13°C40° F/5°C40°F/5°C
Normal Ent. Air 85°F/29°C70°F/21°C85°F/29°C70°F/21°C
Max. Ent. Air
➀➁
110°F/43°C90°F/32°C 110°F/43°C90°F/32°C
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