Specifications

IM 1060-3 / Page 11 of 32
Operating Limits
Environment
This equipment is designed for indoor installation only. Shel-
tered locations such as attics, garages, etc., generally will not
providesufcientprotectionagainstextremesintemperature
and/or humidity, and equipment performance, reliability, and
service life may be adversely affected.
Table 4: Air Limits - °F (English units)
Standard Range Geothermal Range
Units Units
Cooling Heating Cooling Heating
Min. Ambient Air 50ºF 50ºF 40ºF 40ºF
Normal Ambient Air 80ºF 70ºF 80ºF 70ºF
Max Ambient Air 100ºF 85ºF 100ºF 85ºF
Min. Entering Air 1,2 50ºF 50ºF 50ºF 40ºF
Normal Entering Air db/wb 80/67ºF 70ºF 80/67ºF 70ºF
Max Entering Air db/wb 1,2 100/83ºF 80ºF 100/83ºF 80ºF
Table 5: Air Limits - °C (SI units)
Standard Range Geothermal Range
Units Units
Cooling Heating Cooling Heating
Min. Ambient Air 10ºC 10ºC 5ºC 5ºC
Normal Ambient Air 27ºC 21ºC 27ºC 21ºC
Max Ambient Air 38ºC 29ºC 38ºC 29ºC
Min. Entering Air 1,2 10ºC 10ºC 10ºC 5ºC
Normal Entering Air db/wb 27/19ºC 21ºC 27/19ºC 21ºC
Max Entering Air db/wb 1,2 38/28ºC 27ºC 38/28ºC 27ºC
Table 6: Water - °F (English units)
Standard Range Geothermal Range
Units Units
Cooling Heating Cooling Heating
Min. Entering Water
1,2
55ºF 55ºF 30ºF 20ºF
Normal Entering Water 85ºF 70ºF 77ºF 40ºF
Max Entering Water 110ºF 90ºF 110ºF 90ºF
Table 7: Water - °C (SI units)
Standard Range Geothermal Range
Units Units
Cooling Heating Cooling Heating
Min. Entering Water
1,2
13ºC 13ºC -1ºC -6ºC
Normal Entering Water
29ºC 21ºC 25ºC 4ºC
Max Entering Water
43ºC 32ºC 43ºC 32ºC
Notes:
1. At ARI ow rate.
2. Maximum and minimum values may not be co bined.
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.
5. Set thermostat to “Heat.” If the thermostat is the automatic
changeover type, set system switch to the “Auto” position
and depress the heat setting to the warmest selection.
Some conditioners have built-in time delays which
prevent the compressor from immediately starting. With
most control schemes, the fan will start immediately. After
a few minutes of compressor operation, check for warm
air delivery at discharge grille. If this is a “cold building”
start-up, leave unit running until return air to the unit is at
least 65°F (18°C).
Measure the temperature difference between entering and
leaving air and entering and leaving water. With entering
water of 60°F to 80°F (16°C to 27°C), leaving water
should be 6°F to 12°F (3.3°C to 6.6°C) cooler, and the air
temperature rise through the machine should not exceed
35°F (19°C). If the air temperature exceeds 35°F (19°C),
thenthewaterowrateisinadequate.
6. Check the elevation and cleanliness of the condensate line.
Iftheairistoodryforsufcientdehumidication,slowly
pour enough water into the condensate pan to ensure
proper drainage.
7. If the conditioner does not operate, check the following
points:
a. Is supply voltage to the machine compatible?
b. Is thermostat type appropriate?
c. Is thermostat wiring correct?
8. If the conditioner operates but stops after a brief period:
 a. Isthereproperairow?Checkfordirtylter, 
incorrect fan rotation (3-phase fan motors only), or
incorrect ductwork.
 b. Isthereproperwaterowratewithintemperature
limits?Checkwaterbalancing;backushunitifdirt-
clogged.
9. Check for vibrating refrigerant piping, fan wheels, etc.
10.Donotlubricatethefanmotorduringtherstyearof
operation as it is prelubricated at the factory.
11. Field supplied relays installed on the input terminals W1,
W2, Y1, Y2 or G may introduce electrical noise. Never
install relay coils in series with the inputs.