Page 8 / IM 778
Operating Limits
Standard Range
Geothermal Range
Units
Units
Cooling
Heating
Cooling
Heating
Min. Ambient Air
50˚F/10˚C 50˚F/10˚C
40˚F/5˚C
40˚F/5˚C
Normal Ambient Air
80˚F/27˚C 70˚F/21˚C
80˚F/27˚C 70˚F/21˚C
Max. Ambient Air
100˚F/38˚C 85˚F/29˚C 100˚F/38˚C 85˚F/29˚C
Min. Ent. Air
➀ ➁
50˚F/10˚C 50˚F/10˚C
50˚F/10˚C
40˚F/5˚C
Normal Ent. Air,
80/67˚F
70˚F
80/67˚F
70˚F
dw/wb
27/19˚C
21˚C
27/19˚C
21˚C
Max. Ent. Air
100/83˚F
80˚F
100/83˚F
80˚C
db/wb
➀ ➁
38/28˚C
27˚C
38/28˚C
27˚C
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.
This equipment is designed for indoor installation only.
Sheltered locations such as attics, garages, etc., generally
will not provide sufficient protection against extremes in
Environment
Standard Range units FCV
Units are designed to start-up in an ambient of 50°F (10°C),
with entering air at 50°F (10°C), with entering water at 70°F
(21°C), with both air and water 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 con-
dition. It is assumed that such a start-up is for the purpose
of bringing the building space up to occupancy
temperature.
Geothermal range units FCW
Geothermal range heat pump conditioners are designed to
start-up in an ambient of 40°F (5°C), with entering air at
40°F (5°C), with entering water at 25°F (-4°C), with both air
and water at flow rates used in the ARI Standard 330-86
rating test, for initial start-up in winter.
Note: This is not a normal or continuous operating con-
dition. It is assumed that such a start-up is for the purpose
of bringing the building space up to occupancy
temperature.
temperature and/or humidity, and equipment performance,
reliability, and service life may be adversely affected.
Air limits
Water limits
Standard Range
Geothermal Range
Units
Units
Cooling
Heating
Cooling
Heating
Min. Ent. Water
➀ ➁
55°F/13°C 55°F/13°C
30°F/-1°C 20°F/-6°C
Normal Ent. Water
85°F/29˚C 70˚F/21°C
77°F/25˚C
40˚F/5°C
Max. Ent. Water
➀ ➁
110°F/43˚C 90°F/32°C 110°F/43˚C 90°F/32°C
Additional Information For Initial Start-up Only
Operating voltages
115/60/1 . . . . . . . . . . . . . . . 104 volts min.; 127 volts max.
208-230/60/1 . . . . . . . . . . . 197 volts min.; 253 volts max.
265/60/1 . . . . . . . . . . . . . . . 238 volts min.; 292 volts max.
230/50/1 . . . . . . . . . . . . . . . 197 volts min.; 253 volts max.
460/60/3 . . . . . . . . . . . . . . . 414 volts min.; 506 volts max.
380/50/3 . . . . . . . . . . . . . . . 342 volts min.; 418 volts max.
575/60/3 . . . . . . . . . . . . . . . 515 volts min.; 632 volts max.
Note: Voltages listed are to show voltage range. However,
units operating with over voltage and under voltage for
extended periods of time will experience premature com-
ponent failure. Three phase system unbalance should not
exceed 2%.
