Startup
Open all valves to full open position and turn on power to the conditioner.
1. Set mode to “Cool”. Set the cooling temperature to the coolest position. 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 1 1/3 times greater than the heating mode temperature
difference. For example, if the cooling temperature difference is 6ºC, the heating temperature difference
should have been 5ºC.
Without automatic flow control valves, target a cooling temperature difference of 5ºC to 8ºC. Adjust the
combination shut off/balancing valve in the return line to a water flow rate which will result in the 5ºC to
8ºC difference.
2. Set mode to “Heat”. Set 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 18ºC.
Measure the temperature difference between entering and leaving air and entering and leaving water.
With entering water of 16ºC to 27ºC, leaving water should be 3.3ºC to 6.6ºC cooler, and the air
temperature rise through the machine should not exceed 19ºC. If the air temperature exceeds 19ºC, then
the water flow rate is inadequate.
3. 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.
4. 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?
5. If the conditioner operates but stops after a brief period:
a. Is there proper airflow? Check for dirty filter, incorrect ductwork.
b. Is there proper water flow rate within temperature limits? Check water balancing; back flush unit if dirt
clogged.
6. Check for vibrating refrigerant piping, fan wheels, etc.
7. Do not lubricate the fan motor during the first year of operation as it is lubricated at the factory.
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