Specifications

Start-Up
1. Open all valves to full open position and turn on power to the conditioners.
2. Set thermostat for "Fan Only" operation by selecting "Off " at the system switch and "On" at the fan
switch. If "Auto" fan operation were selected, the fan would cycle with the compressor. Check for proper
air delivery.
3. All units have three-speed motors.
4. Set thermostat to "Cool". Many conditioners have time delays which protect the compressor 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 11/2 times
greater than the heating mode temperature difference. For example, if the cooling temperature
difference is 15°F (8℃), the heating temperature difference should have been 12°F (5℃).
Without automatic flow control valves, a cooling temperature difference of 10°F to 14°F (5℃ to 8℃) is
about right. Adjust the combination shutoff/balancing valve in the return line to a water flow rate which
will result in the 10°F to 14°F (5℃ to 8℃) difference.
5. Set thermostat to "Heat ". 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℃).
Measure the temperature difference between entering and leaving air and entering and leaving water.
With entering water of 60°F to 80°F (16℃ to 27℃), leaving water should be 6°F to 12°F(3.3℃ to 6.7℃)
cooler, and the air temperature rise through the machine should not exceed 35°F(19℃). If the air
temperature exceeds 35°F(19℃), the airflow rate is probably inadequate.
If the water temperature difference is less than 6°F (3.3℃), the water flow rate is excessive. If the water
temperature difference exceeds 12°F (6.7℃), then the water flow rate is inadequate.
6. Check the elevation and cleanliness of the condensate line. If the air is too dry for sufficient
dehumidification, slowly pour enough water into the condensate pan to ensure proper drainage.
7. If the conditioner does not operate, the following points should be checked:
a. Is proper voltage being supplied to the machine？
b. Is the proper type of thermostat being used？
c. Is the wiring to the thermostat correct？
8. If the conditioner operates but stops after a brief period, check for:
a. Is there proper airflow？Check for dirty filter, incorrect ductwork.
b. Is there proper water flow rate within temperature limits？Check water backflush unit if dirt clogged.
9. Check the unit for vibrating refrigerant piping, fan wheels, etc.
10. Do not lubricate the fan motor as it is prelubricated at the factory.
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