55
Troubleshooting
Prior to proceeding with troubleshoot, make certain the unit passes the self-test. Refer to “Figure 54. Self-Test Operational
Flowchart” on page 54“. Follow these steps to initiate self-test:
1.
Open the Access Door. (This will release the door switch).
2.
Depress the door switch located on the cabinet to energize the unit.
3.
Observe the sequence of operation to verify the unit is operating correctly.
Table 26. Troubleshooting
Symptom
Cause
Solution
Poor airflow(s)
• Mesh on outside hoods plugged
• Filters plugged
• Core obstructed
• House grilles closed or blocked
• Dampers closed (if installed)
•
Poor power supply at site
• Ductwork is restricting ERV/HRV
Improper speed control setting
•
ERV/HRV airflow improperly balanced
• Clean exterior hoods or vents
•
Remove and clean both filter and core
•
If unit is equipped with MERV 13 filters, replace every 3 months.
• Check and open grilles
• Open and adjust dampers
• Have electrician check supply voltage at house
• Check duct installation
• Increase the speed of the ERV/HRV Have contractor balance the ERV/HRV.
Supply air feels cold
•
Poor location of supply grilles
•
Airflow may irritate occupants
• Outdoor temperature extremely cold
• Locate the grilles high on the walls or under the baseboards
•
Install ceiling mounted diffuser or grilles so as not to direct airflow onto occupants
(e.g. over a sofa).
• Turn down the ERV/HRV supply speed.
• A small duct heater (1kw) could be used to temper the supply air.
•
Placement of furniture or closed doors restricting movement of air in home; consid
-
er rearranging.
• If supply air is ducted into furnace return, the furnace fan may need to run continu-
ously to distribute ventilation air comfortably.
Dehumidistat is not
operating
•
Outdoor temperature is above 59ºF (15ºC)
•
Improper low−voltage connection
• External low voltage is shorted out by a staple
or nail
• Check dehumidistat setting; it may be OFF
•
Dehumidistat is functioning normally (see “Figure 55. Dehumidistat Disable” on
page 54).
• Check that the correct terminals have been used, Check external wiring for a
short.
• Set the dehumidistat at the desired level.
Humidity levels are
too high; condensa-
tion is appearing on
windows
• Dehumidistat set too high
• ERV/HRV unit is undersized to handle a hot tub,
indoor pool, etc. (Occupant Lifestyle)
• Moisture coming into the home from an non-vent-
ed or non-heated crawl space
• Moisture remaining in washroom and/or kitchen
areas
• Condensation seems to form in the spring and
fall seasons
• ERV/HRV is set at too low a speed
• Set dehumidistat at lower level.
• Cover pool or hot tub when not in use.
• Avoid hanging clothes to dry indoors, storing wood indoors, and
venting dryer inside.
•
Vent crawl space and place a vapor barrier on the floor of the crawl space.
• Ducts from washroom should be sized to remove moist air as effectively as possi-
ble; use of a bathroom fan for short periods will remove additional moisture.
• On humid days, as seasons change, some condensation may appear but the
home’s air quality will remain high with some ERV/HRV use. Increase speed of
ERV/HRV.
Humidity levels are
too low
• Dehumidistat control set too low
• Blower speed of ERV/HRV is too high
• Occupant lifestyle issue
•
ERV/HRV airflows may be improperly balanced
• Set dehumidistat at higher level. Decrease ERV/HRV blower speed.
•
Humidity may have to be added through use of humidifiers.
•
Have a contractor balance ERV/HRV airflows.
HRV units and/or
ducts frosting up
•
HRV air flows are improperly balanced
• Malfunction of the HRV defrost system
NOTE:
Minimal frost build−up is expected on cores before unit initiates defrost cycle
functions.
Have HVAC contractor balance the HRV airflows. Ensure damper defrost is operating
during self−test.
Condensation or ice
build−up in insulated
duct to the outside
• Incomplete vapor barrier around insulated duct
• Hole or tear in outer duct covering
• Tape and seal all joints.
• Tape any holes or tears made in the outer duct covering. Ensure that the vapor
barrier is complete sealed.
Water in the bottom
of the ERV/HRV unit
• Drain pans plugged
• Improper connection of ERV/HRV drain lines
• ERV/HRV is not level
• Drain lines obstructed
• ERV/HRV heat exchange core is not properly
installed
•
Ensure o−ring on drain nozzle sits properly.
• Look for kinks in the drain line.
• Check water drain connections.
• Make sure water drains properly from pan(s).
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