Tjernlund RT1500(H) Rooftop Inducers 8504160 Rev A - Manuel (Page 14)

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RT750 / RT1500 - PSA-1 FAN PROVING SWITCH ADJUSTMENT WITH UC1 OR UCRT INTERLOCK CONTROL
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 N, Page 7).
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 proceeding.
Remove power source and connect leads attached to the C (common) and N/O (normally open) terminals of the PSA-1 together.
Attach a continuity tester to the C and N/O 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 heaters(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. If installing this product in conjunction with a
Tjernlund Products UC1 interlock control the number 9 dip switch must be positioned in the up/’on’ position.
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.
4. Activate Rooftop Inducer and adjust balancing baffle(s) or speed control 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 Inducer. Do not move sampling probe between manual damper and Inducer inlet.
5. Activate burner(s) at full capacity. Gradually adjust balancing baffle(s) or speed control to maintain a slight negative draft
(-0.02" to -0.05" W.C. or -5 to -12.5 Pa) at the heater’s draft sampling location(s). Allow vent temperatures to reach steady
state by referencing breaching flue gas temperatures.
6 Once flue gas temperatures have stabilized, verify that balancing baffle(s) or speed control are adjusted so that a slight negative
draft (-0.02" to -0.05" W.C or -5 to -12.5 PA) is measured at draft sampling location(s). Individual appliance vent connections may
require balancing baffles to evenly regulate draft.
7. Adjust balancing baffle(s) or speed control so that a slight positive draft (neutral to +0.01" W.C. or +2.5 Pa) is measured at the
appliance draft sampling location. Flue gases should just start to spill from the draft hood/draft diverter or barometric draft control.
8. Turn the PSA-1 Fan Prover Switch adjustment screw clockwise in 1/6-turn increments, waiting 2-3 seconds after each adjustment
until the pressure switch opens and no continuity is read. Shut off heater for 5 minutes while continuing to allow inducer to operate.
9. Fire heater and readjust the balancing baffle(s) or speed control so that a negative draft (-0.02 to -0.05" W.C. or -5 to -12.5 Pa ) is
once again measured at the appliance draft sampling location. This readjustment must be enough to cause the PSA-1 Fan Prover
Switch to close. The PSA-1 may take a few moments to close after each adjustment.
10. Confirm Fan Prover Switch set point by adjusting balancing baffle(s) or speed control so that a slight positive draft (neutral to
+0.01" W.C. or +2.5 Pa) is measured at the appliance draft sampling location. Flue gases should just start to spill from the draft
hood/draft diverter or barometric draft control and the Fan Prover Switch should open. Readjust the balancing baffle(s) or speed
control so that a negative draft (-0.02 to -0.05" W.C. or -5 to -12.5 Pa) is once again measured at the appliance draft sampling
location. Verify that the PSA-1 Fan Prover Switch closes.
11. IMPORTANT: Reconnect PSA-1 Fan Prover leads to switch that were jumpered together in Step # 3. Run entire heating/vent
system through 3 cycles to verify proper burner light off and operation. Verify that each appliance lights off properly with all other
appliances not firing. If barometric draft control(s) are excessively open, adjust weight so the draft control damper opens less and
repeat process starting with Step # 3.
12. Sign and date these instructions to verify that the PSA-1 Fan Prover interlock was completed.
These instructions must remain on premises. SIGN:_________________________ DATE:___________
MODEL RT750H / RT1500H SPEED CONTROL ADJUSTMENT
Model RT750H and RT1500H include a motor speed control. Do not alter the internal pot or use a different motor speed control. Do
not wire so that speed control varies the motor cooling fan speed. Always have the inducer operating prior to and during the entire
burn cycle of a solid fuel stove or fireplace.
SPEED CONTROL INSTALLATION
1. Install the speed control in an indoor location adjacent to the solid fuel stove or fireplace, ideally where the flames and smoke can
be viewed when speed adjustments are made.
2. The speed control requires a 2"x4" electrical box. 14-3 w/ground electrical wire is recommended because it consists of a white
(neutral), Black (constant hot), Red (switched variable through speed control) and Green (ground) leads. Commercial applications
may require 12 gauge wire and electrical disconnect on roof.