Rev 6.1 November 1, 2016
20
c)
Verification that intake and exhaust air flows are properly balanced.
d)
Re-balancing as necessary.
7.
TROUBLE SHOOTING
SYMPTOM
EXPLANATION
ANSWER
The humidity level seems
too low.
•
HRV air flows incorrectly balanced.
•
Dehumidistat control set too low.
•
Lifestyle of the resident(s).
•
Balance air flow(s).
•
Increase dehumidistat.
•
Humidifiers may need to be added.
The humidity level seems
too high.
•
HRV air flows incorrectly balanced.
•
HRV not properly sized for the application
•
High humidity areas not ventilated properly.
•
Lifestyle of resident(s).
•
Dehumidistat is not working.
•
Balance airflow.
•
Set dehumidistat.
•
Cover pools etc. when not in use.
•
Avoid hanging clothes to dry, storing wood and
venting clothes dryer inside.
The house is dry but the
basement wet.
•
High humidity during summer months
•
Install a programmable timer on 12-hour cycle. On
at night. Off during the day.
•
Partially close some grills upstairs, open grills in
basement.
The Controls or
Dehumidistat are not
working.
•
Incorrect connection of outside low voltage
wiring between HRV and dehumidistat.
•
Check control wiring for short
•
Check wall switch for correct connection.
•
Check wires are connected to proper terminals at the
HRV
There is Frosting up of the
HRV and/or duct(s).
•
HRV air flows incorrectly balanced.
•
HRV defrost system is not working.
•
Balance HRV.
•
Check integral damper function (where present).
Install back draft dampers as needed.
•
Check defrost system.
•
Note minimal frost build up is expected on cores
before unit initiates defrost cycle function.
The supply air feels cool.
•
HRV air flows incorrectly balanced.
•
Improper location of supply grills.
•
Extremely cold outside temperatures.
•
Moving air feels cooler than it actually is.
•
Balance HRV.
•
Locate grills high on walls or in ceiling.
•
If supply air is installed into return line of furnace,
furnace fan must run continuously on low speed.
The outside duct has ice
build up or condensation.
•
Improperly installed vapour barrier around
insulated duct.
•
Tape all joints.
•
Ensure that vapour barrier is completely sealed and
insulated.
There is water in the bottom
of HRV.
•
Drain pans are plugged.
•
Incorrect connections of HRV’s drain lines.
•
HRV is not level.
•
Drain lines plugged.
•
HRV heat exchange core improperly
installed.
•
Look for kinks in the line.
•
Check water drain connections.
•
Ensure that water drains from pan.
There is poor air flow(s)
•
HRV airflow incorrectly balanced.
•
Filters need to be cleaned.
•
Mesh on outside hoods needs to be cleaned.
•
Grills are closed.
•
Present dampers are closed.
•
Low power supply.
•
Wrong-size ducting.
•
Under-sized HRV.
•
HRV is not working.
•
Tape all joints.
•
Use proper air flow measuring equipment.
•
Open grills.
•
Remove obstructions in duct(s), hoods(s), and
grill(s).
•
Balance air flows.
•
Clean filter.
•
Have a professional look at the system.
IMPORTANT!
Only qualified technicians should service controls or internal components.
