Therma-Stor Products Group Quiet-Vent Ventilation System - Manual (Page 6)

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 3. 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 Ultra-Aire Quiet Vent is guaranteed for two years from
the date of installation against all manufacturing defects
provided the Ultra-Aire 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 4026929 1 Blower, w/Capacitor, 115V
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
FOR HVAC INSTALLER ONLY