Tjernlund RT1500 Rooftop Draft Inducer 8504160 Rev 12/09 - Manuel (Page 11)

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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.
3. After speed control is installed and wired per Option 2 on Page 8, install included faceplate to junction box and push adjustment
knob onto shaft of speed control.
4. Verify that Rooftop inducer activates when speed control is switched on and that Inducer performance decreases when knob is
turned fully clockwise. This can be done by holding a candle in the unlit fireplace or stove near the flue outlet and observing flame
and smoke.
COMBUSTION AIR
Adequate combustion air is vital for proper combustion and for safe venting. Likewise, for proper Inducer performance, adequate com-
bustion air must be available to the appliance. Many installers assume adequate combustion air is present, especially in older struc-
tures. In some cases this is a false assumption, because many structures have been made "tight" due to weatherization. Size the
combustion air opening(s) into the equipment room as outlined in NFPA 31, 54 & 211. Tjernlund’s IN-FORCER
TM combustion air intake
systems provide a convenient, automated way to supply combustion air to the equipment room. When installing the Rooftop Inducer it
is not necessary to supply any more combustion air than normally required when conventional venting.
INSPECTION & MAINTENANCE
The Rooftop Inducer is designed for continuous use. The motor is equipped with permanently lubricated sealed ball bearings which do
not require oiling.
A vent pipe / chimney inspection must be performed annually. The inspection should include checking all vent pipe and connections
for blockage and leaks. A safety interlock test as outlined in Step # 11 under “RT750 / RT1500 PSA-1 Fan Proving Switch Adjustment”
starting on Page 9 must also be performed annually for models RT750 & RT1500.
For oil and solid fuel applications inspect impeller after (3) months and set up a periodic inspection and cleaning routine as necessary.
If used on a fireplace that is used regularly (2-3 times a week), semi annual chimney cleaning may be required to prevent creosote
buildup. If used on a commercial wood-fired pizza oven cleaning may be required every 2-3 months. No matter how often used, a
chimney serving wood-fired appliances should be cleaned and inspected at least once a year.
CLEANING
IMPORTANT: Disconnect the power supply when making wiring connections or when working around the fan impeller and motor.
1. Remove (2) latch screws opposite hinge side on the front of Rooftop Inducer housing. Open housing until side hinge stops
are engaged. Remove discharge grilles for greater access to impeller.
2. If necessary, use scraper and/or brush to clean soot and creosote buildup on the impeller and inside inducer base. Use caution
not to displace impeller balancing weights.