Specifications

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10.Donotlubricatethefanmotorduringtherstyear
of operation as it is prelubricated at the factory.
1
1. 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.
Operating Limits
Environment
This equipment is designed for indoor installation only.
Sheltered locations such as attics, garages, etc., generally will
notprovidesufcientprotectionagainstextremesintempera-
ture and/or humidity, and equipment performance, reliability,
and service life may be adversely affected.
At ARI flow rate.

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
n
ot more than two, with all other conditions being normal conditions.
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
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 5: Air Limits - °F (English units)
Table 6: Air Limits - °C (SI units)
Again, many conditioners have time delays which
protect the compressor(s) against short cycling.
After a few minutes of operation, check the
discharge grilles for cool air delivery. Measure the
temperature difference between entering and leaving
water. It should be approximately 1½ times greater
than the heating mode temperature difference. For
example, if the cooling temperature difference is
15°F (8°C), the heating temperature difference
should have been 10°F (5°C).

Withoutautomaticowcontrolvalves,targeta
cooling temperature difference of 10°F to 14°F
(5°C to 8°C). Adjust the combination shutoff/
balancing
valveinthereturnlinetoawaterowrate
whichwillresultinthe10˚Fto14°F(5°Cto8°C)
difference.
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.
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
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
Table 7: Water - °F (English units)
Table 8: Water - °C (SI units)