Troubleshooting
Water drips from conditioner:
1.
Check for dirty filter.
2.
Check to see if condensate drain runs uphill.
3.
See if blower motor is up to speed.
4.
Check for loose or mispositioned blower.
5.
Are drains properly trapped?
Noisy unit operation:
1.
Check for fan wheel hitting the housing. Adjust for clearance.
2.
Check for bent fan wheel. Replace if damaged. Check for loose fan wheel on shaft. Tighten.
3.
Make sure compressor is floating free on its isolator mounts.
4.
Check for tubing touching compressor or other surface. Readjust tubing by bending slightly.
5.
Check screws on all panels. Tighten.
6.
Check for chattering or humming in the contactor relays due to low voltage or a defective holding coil.
Replace component.
7.
Check water balance to unit for proper water flow rate.
Start-up
1.
Open all valves to full open position and turn on power to the conditioner.
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.
Set thermostat to COOL. If the thermostat is an automatic changeover type, simply set the cooling
temperature to the coolest position. On manual changeover types additionally select COOL at the system
switch. Again, 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 1 1/2
times greater than the
heating mode temperature difference. For example, if the cooling temperature difference is 15 degrees, the
heating temperature difference should have been at ten degrees. Without automatic flow control valves,
target a cooling temperature difference of 10° to 14°F (5° to 8°C). Adjust the combination shutoff/balancing
valve in the return line to a water flow rate which will result in the 10° to 14° (5° to 8°C) difference.
4.
Set thermostat to HEAT. If 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° to 80°F (16° to 27°C), leaving water should be 6° to 12°F (3.3° to 6.6°C)
cooler, and the air temperature rise through the machine should not exceed 35°F (19°C). If the air
temperature rise exceeds 35°F (19°C), then the water flow rate is probably inadequate. If the water
temperature difference is less than 6 degrees, the water flow rate is excessive. If the water temperature
difference exceeds 12°F (6.6°C), then the water flow rate is inadequate.
5.
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.
6.
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?
