IO-123163 Effective 01-14-2016
13
4.
Little or no heat from water coil.
a. Purge the system.
b. The inlet connections may be reversed at the fan coil.
c. Water heater thermostat is not set at proper temp.
d. Water heater thermostat is not calibrated.
e. Dip tube in the water heater may not be installed correctly or
could be restricted.
f. Look for restrictions in heating system from water heater to
fan coil. Some water heaters are supplier with check valves,
remove any extra check valves except for the one supplied with
the fan coil.
g. The air handler is undersized for space being heated.
h. Water heater is undersized.
Note: All units installed in Massachusetts are required to be in
compliance with CMR 248 Massachusetts State Plumbing Code
and/or Massachusetts Fuel Gas Code.
These codes require the use of an optional pump timer to circulate
the hydronic loop independent of the thermostat.
1.
Noisy Pump
System may not be totally purged of air. Purge the system again as
described in the start up section above.
2.
T&P valve on water heater weeps This normally occurs when a
backflow preventer has been installed in the cold water supply line
to the water heater. An expansion tank may be necessary to correct
this problem. Please contact a qualified plumbing professional for
assistance.
3.
Hot water is circulating through the water coil during cooling
cycle The check valve may be stuck open and allowing hot water to
circulate through the coil.
20. Common Problems and Solutions
21. Final System Checkout
1.
Make certain all cabinet openings are properly sealed and any
grommets moved during installation are moved into proper place.
2.
With cooling system operating, check for condensate leakage.
3.
Perform leak detection inspection of refrigerant circuit and
connecting piping.
4.
Secure all cabinet doors
