Reznor OH Unit Installation Manual - Manual (Page 18)

Form I-OH, PN 120390 R5, Page 18
of more than ten pounds per square inch on the tank. This test shall be maintained
for at least 30 minutes or for sufficient time to complete a visual inspection of all
joints and connections. Instead of a pressure test to check piping, suction lines
may be used under a vacuum of not less than 20 inches of mercury maintained for
at least 30 minutes.
□
Check vents. Be sure that vent pipe and chimney meet requirements shown
in Paragraph 6.2. An approved draft regulator is required. In order to measure
the draft in the stack after firing, drill a 5/16" hole in the flue pipe halfway
between the heater and the draft regulator for insertion of the draft gauge.
□
Check electrode adjustment. See instructions in Paragraph 9.2.3. Turn off the
electric power before making check.
□
Check oil delivery. For an accurate check on the oil delivery, remove the burner
assembly and connect it outside the firebox. Disconnect high tension lead. Start
the burner, collect the oil flow for one minute and measure it in a container marked
in cubic centimeters. (Some safety controls may trip when operated for one min-
ute. If this occurs, collect the flow from the nozzle for 30 seconds, measure the
cubic centimeters, multiply by two and check with the chart.) Listed in the table is
the required flow in cubic centimeters (cc) per minute to obtain the output in gal-
lons per hour.
8.2 Check-Test-
Start (Operating
Procedure)
□
Priming the heater -- single pipe system. The oil supply line to the heater must
be full of oil and free of air for proper heater operation. Follow the steps below to
fill the oil line. Note: Priming the oil line could take up to 30 minutes depending on
the size of heater and the length of the supply line.
1. Be sure that the oil tank is filled to a level at least 6" (152mm) above the foot valve.
2. Set the thermostat to its lowest setting.
3. Connect a piece of rubber tubing to the air bleed valve on the burner pump (See
FIG-
URE 19) and place the other end into an open container (no smaller than a pint).
4. Turn off the electrical power at the switch on the heater electrical box. See FIGURE
20.
5. Using a 3/8" wrench, loosen the air bleed valve two or three turns.
6. Set the thermostat above room temperature.
7. Turn the electric power on. Burner pump will operate.
8. Oil will run into the container when the air has been bled from the line. (While operat-
ing under these conditions, the heater will not light because the pressure valve in the
pump will not open.) If the primary control activates to shut down the pump before the
line is bled, push the reset button. See FIGURE 20. It may be necessary to push the
reset button several times while bleeding off air. Wait three to four minutes between
pushes of the reset button to allow the internal bimetal strip to cool down. The pump
will run for 45 seconds each time.
9. After all of the air is bled from the line, close the bleeder valve. Turn the main power
off.
□
Priming the Unit - two-pipe supply system. Install a pressure gauge and turn
the burner on. The system will vent itself through the return line. Flame will appear
as soon as the air has been eliminated.
□
Check and adjust nozzle pressure.
1) Install a pressure gauge (125 psig minimum) into the pressure gauge port on the
burner pump. (See FIGURE 19.)
2) The air shutter was preset at the factory. Verify the air shutter setting on the burner
with the chart in FIGURE 21. All other controls should be in normal position.
3) Turn off the electrical power.
4) Set the thermostat to above room temperature.
8. Commissioning
and Startup
(cont'd)
8.1 Checklist Prior
to Startup
(cont'd)
Size GPH CC per Minute
95 0.85 54.0
140 1.25 78.5
190 1.35 85.0
TABLE 10 -
Check Oil
Flow Rate