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5 Service
CAUTION: Requires a qualified service person because electrical
shock hazard is present.
5.1 Circuit Breaker Trips
Check For Short In Wiring:
Turn off the 7-day timer by moving all the spades out. Turn
off all the remote timers and the dehumidistat (if used). If
the circuit breaker trips, locate a short in the wiring. If the
circuit breaker does not trip, activate the 7-day timer. If the
circuit breaker then trips, check the blower motor.
5.2 Blower Operates on One Speed Only
Operates On Low Speed Only:
If the blower operates only on low speed, deactivate the
7-day timer so that unit is not running. Activate one of
the optional controls and then check for voltage to the
relay coil (terminals 7 and 8). See Figure 4. If voltage is
not present, check for a loose wire or a defective optional
control. If voltage is present, check for voltage between
relay terminal 4 and ground. If there is no voltage, the relay
is defective. If there is voltage at terminal 4 and the motor
does not operate, the high speed winding of the blower
motor is defective. Replace the blower.
Operates On High Speed Only:
High speed operation of the blower has priority over low
speed. Verify that all the optional controls are in the off
position. If the blower operates on high speed constantly,
check for voltage between relay terminals 7 and 8. If
voltage is present, one of the optional controls is not
opening and is defective.
If the blower operates only on high speed (when the
optional controls are activated) and is off the rest of the
time, check that the segments on the 7-day timer are
moved to the center of the dial, thus calling for low speed
ventilation. If the blower does not run with the segments
in and the optional controls off, check for voltage between
timer terminal 5 and ground. If terminal 5 does not have
voltage, the timer is defective. If terminal 5 has voltage
and relay terminal 5 does not have voltage, the relay is
defective. If relay terminal 5 has voltage, the low speed
winding of the blower motor is defective.
5.3 7-Day Timer Does Not Advance
Check for voltage between timer terminals 1 and 2. If
voltage is present and the timer does not advance, the
timer motor is defective and the timer must be replaced.
5.4 Fan Motor
If the blower motor fails to operate when voltage is present
at its leads, the motor is defective and the blower must be
replaced.
5.5 Warranty
The Quiet-Vent is guaranteed for two years from the date of
installation against all manufacturing defects provided the
Quiet-Vent has been installed, operated, and maintained
as stated in this manual. This warranty is limited to the
repair or replacement of the equipment, F.O.B. MADISON,
WI. Call the factory at 1-800-533-7533.
6 Service Parts
Item Part Number Qty Description
1 4022036 1 Blower, w/ Capacitor, 115V
(Fasco p/n 7090-1806)
2 4019782 4 Mounting Strap, Rubber
3 4019649 1 Relay, DPDT, 120V, 10A
4 4019648 1 Timer, 7-Day (Diehl TA-4073,
Model 880)
5 4019641 1 Wire Harness, L1
6 4019642 1 Wire Harness, L2
7 4019643 1 Wire Harness, Blue
8 4019644 1 Wire Assembly, Red
9 4019645 1 Wire Assembly, Green
10 4019654 1 Wiring Diagram
Specifications subject to change without notice.