Tjernlund Auto-Draft FSAD & VSAD Series Inducers 8504090 Rev 11/00 - Manual (Page 17)

PSA-1 FAN PROVER SAFETY INTERLOCK AND DRAFT ADJUSTMENT SET-UP PROCEDURE
The following Safety interlock procedure is only suitable when using a FSAD-Series fixed speed venter or a VSAD-Series
Venter adjusted to a fixed speed using a Tjernlund supplied Variable Frequency Drive (VFD). This procedure is not applica-
ble when utilizing the CPC-2 Constant Pressure Controller.
Close all access doors and openings to the mechanical room that would typically be closed during heating equipment operation. Fire
all other heating equipment not connected to this vent system and operate exhaust fans or air consuming devices within the facility
that could affect the air pressure of the mechanical room.
1. Drill an appliance draft sampling hole in the vent riser after each draft diverter or between the flue outlet and the draft hood / baro-
metric draft control of each appliance. For most oil burners sample over-fire draft. Connect draft gauge to sampling hole,
(See Diagram I, Page 8).
2. For installations with a barometric draft control: Adjust weight on draft control to minimum or most responsive position (Less
Draft).
3. WARNING: This step requires that the wires connected to the PSA-1 Fan Prover terminals be temporarily removed and
jumpered together. Disconnect power before jumpering wires. Remove power source to Attach a continuity tester to the
common and normally open terminals of the PSA-1 Switch. Turn the PSA-1 adjustment screw counter clockwise until it seats
against the stop. The PSA-1 must be reconnected to the interlocked appliance(s) per the appropriate wiring diagram after
completing these procedures. Failure to do so may result in a hazardous condition such as an explosion, fire or carbon
monoxide poisoning resulting in property damage, personal injury or death.
4. Activate Auto-Draft® Venter and adjust common manifold manual damper or VFD so that (-0.08” W.C. or -20 Pa) is read at the
appliance draft sampling position(s) referenced in Step 1. The PSA-1 switch contacts should close. If switch contacts do not close
move pressure sampling probe closer to the Auto-Draft®. Do not move sampling probe between manual damper and Venter inlet.
Doing so may render the PSA-1 incapable of sensing flue gas spillage at the appliance.
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VSAD-8/10/12 WIRED WITH A SINGLE OIL BURNER AND 950-1067 1-10 MINUTE ADJUSTABLE POST-PURGE RELAY/TIMER
IMPORTANT: Impeller must rotate
counter-clockwise. See “Wiring sec-
tion of these instructions to confirm
proper rotation on VSAD-Series.