Reznor ADFH Unit Installation Manual - Manual (Page 26)

Form I-ADF, Page 26
6. Check pilot pressure and operation --

To check pilot gas pressure, connect a "U"-tube manometer to the pressure tap on
the downstream side of the pilot solenoid valve.
 Put BOTH blower and burner switches in TEST position. Turn ON disconnect
switch. After blower reaches speed, all lights should be lit except "Pilot Valve" and
"Main Valve". Turn on the gas supply. After 15-20 seconds, the "Pilot Valve" light
will be energized, followed by the "Main Valve" light.
 Measure pilot gas pressure. Pilot pressure for natural gas should be 3.5" w.c.;
propane gas should be 6" w.c. Pilot pressure should be correct, but if the pressure
is not correct, discontinue startup until the pilot gas pressure is regulated correctly.
(To adjust pilot pressure, remove the cap from the regulator. Turn adjustment
clockwise to increase gas pressure or counterclockwise to decrease gas
pressure.) When pressure is correct, shut off the gas, remove the manometer, and
replace the pressure tap cap on the pilot solenoid valve.
 To check lockout feature of the pilot ignition system, turn pilot manual shutoff valve
OFF. Pilot should lockout after two trials for ignition. To reset unit, cycle the main
disconnect switch.
7. Verification of inlet gas pressure --
If, with the blower and burner operating, the main inlet gas pressure measured in
Step 4 does not correspond to the minimum stated on the rating plate, check the
main burner inlet gas pressure. If the main inlet gas pressure is lower than that sated
on the rating plate, full burner firing will not be achieved. Check main gas supply
service regulator for adjustment.

Turn disconnect switch OFF.
 Re-connect the "U"-tube manometer to the main burner pressure tap.
 Turn pilot manual shutoff valve back ON.
 Turn the disconnect switch ON; ignition sequence will occur.
 Observe the main burner; light off should occur along the entire length of the
burner. After approximately one minute, record the gas pressure reading on the
manometer.
 Calculate the required burner differential gas pressure. Differential gas pressure is
the figure used when determining minimum gas supply pressure. Add differential
gas pressure plus the drop in gas pressure as it flows through the gas train (See
Paragraph 6.1) to determine the minimum required supply pressure of inlet gas.
For maximum firing rate, a minimum of 4.3" w.c. of actual measured natural gas
pressure is required at the burner (If maximum firing is not required divide the
actual input rate by the maximum rate, square the answer, and multiply by 4.3"
w.c. to determine the required gas pressure at less than maximum capacity.)
 Turn disconnect switch OFF. If the gas pressure is determined to be adequate,
continue with the startup of the system. If the gas pressure is not adequate for the
system, discontinue startup until the gas pressure problem is resolved.
 Remove the manometer and replace the plug.
 If connected in Startup Step 2, remove the jumper wire running from Terminal 3
to Terminal 4. Re-connect the optional "control relay" contacts to Terminal 3 and
Terminal 4.
 Put BOTH the burner and blower switches in RUN position.
 Close the electrical box and close the control door panel. Secure latches.
 Turn ON the disconnect switch. The system is now operational from the control
switch, the remote console, and/or other type of optional automatic control.
 Return this manual to the owner's envelope. Keep for future reference.
 To check for toxic vapors coming from the surrounding outside atmosphere or
being produced by the installation, it is recommended that the tempered makeup
air entering the building be tested at its point of discharge from the heating unit.
The table below shows limits for various substances including carbon monoxide.
Certified, portable detector tubes may be used; follow the manufacturer's
instructions.
9.0 Commissioning
and Startup
(cont'd)
9.2 Startup (cont'd)
9.3 Startup for
Continuous
Operation
9.4 After Startup