VanEE 190 H Installation Manual - page 16
16
9.0 TROUBLESHOOTING
Problems
Possible causes
You should try this
5. The defrost cycle
• Ice deposits may be hindering
• Remove the ice.
doesn't work
the damper operation.
(the fresh air duct is
• The damper rod or the port
• Inspect these parts and replace if necessary.
frozen OR
damper itself might be broken.
the fresh air distributed • The damper actuator might be defective. • Plug in the unit and select “OFF”. Press the door switch and
is very cold.)
see if the port damper closes. If it doesn’t close, feed 120 V
directly to the damper actuator. If the port damper still doesn’t
close, replace the damper actuator.
• The circuit board might be defective.
• Unplug the unit. Unplug the defrost sensor wire (see J4 on
electrical diagram). Plug the unit back in. Select “MIN” and
make sure the unit is adjusted for low speed operation (turn
dial on Constructo control maximum counterclockwise). Wait 3
minutes. The unit should switch to high speed and the damper
at the fresh air intake port should close (defrost mode). If this
doesn’t happen, then replace the circuit board.
6. Unit on high speed
• The thermistor may be defective.
• If the defrost mode works well after having disconnected the
every 20 min. per hour.
thermistor wire (above test), then this means the thermistor is
probably defective. You should replace it.
Long term troubleshooting:
Problems
Possible causes
You should try this
7. Cold air at registers.
• The registers are poorly located.
• Relocate the registers according to instructions in Section 3.4.
• Unit continously on high speed.
• Tell owner to set to low speed, especially during cold weather.
• The temperature outside is extremely cold. • Suggest adding a ‘’duct heater” in the system. Consider connecting
the “extended defrost” option (see electrical diagram).
• The system needs rebalancing.
• Rebalance the system (see Section 5).
• The defrost is not working.
• See point 5 above.
8. Persistent condensation • Refer to the user’s manual section 3.0.
• Refer to user’s manual section D.
on windows.
• Dehumidistat defective.
• See point 4 on page 13.
• Occupants might need more controls.
• Suggest installing additional timers or dehumidistat.
• Hot tubs or pools present.
• Cover these sources of humidity.
• Firewood in the house.
• Store wood in a closed room with a dehumidifier or have the
room well vented with outside air or store the wood outside.
• Unheated crawl space.
• Prevent circulation of air from the crawl space to the house. If
the crawl space has an earth floor, cover it with a vapor barrier
and 2 to 3 inches (5 to 8 cm) of gravel.
9. Noisy unit.
• Fan wheel is out of adjustment.
• Remove the fan assembly and tighten the loose parts.
• Blower wheel dirty.
• Remove, clean and review with user the maintenance requirements
in his manual.
• Damaged fan assembly.
• Replace.
• Unbalanced wheel.
• Replace.
10. Noisy registers at “max” • The air ducts are too short.
• Install a silencer.
speed.
• The register is too small.
• Replace with larger register.
11. Very little or no air flow. • Dirty filters, exterior hoods clogged up.
• Clean filters and/or hoods and review with user the maintenance
instructions in his manual.
• The system may need rebalancing.
• Rebalance (see Section 5).
12. Snow in the unit.
• The exterior intake hood is poorly located. • Clear snow away from hoods and warn user he/she should
regularly remove snow from near the exterior hoods.
• Install the “Anti-Gust Intake Hood”, part number 12570.
• Turn off the unit during snow storms.
13. Condensation, frost
• The duct insulation is defective
• Make sure there are no tie ducts or duct tape compressing the
or ice inside the
and /or the vapor barrier is torn.
insulation.
insulated ducts.
Check the insulated ducts for any damaged or weak spots.