SAMUEL JACKSON HO-7-1237, Руководство по обслуживанию

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PAGE 25 of 61 HO-7-1237 & HO-4-1234 OIL-FIRED HEATERS
© SAMUEL JACKSON, INCORPORATED 2003 ALL RIGHTS RESERVED
STEP 8 -- Step 8 opens the atomizing air valve. Turn the +/- selector switch to “+” to
turn Atomizing Air Valve AAV on and “- “ to turn it off. Adjust Air Pressure Regulator
APR so air pressure at the gauge after the regulator is equal to the fuel pressure. Now,
slowly close the gate valve in the air supply pipe to reduce the air pressure. Atomizing air
pressure switch AAP should turn OFF Input No. 23 when the pressure falls below 45 psi
(3.1 bars). Adjust AAP if necessary.
Press RESET to proceed.
STEP 9
-- This step will enable the combustion air fan. Turn the +/- selector switch to
"+" to turn it ON and "- " to turn it OFF in this step only. The Combustion Air Pressure
Switch CAP has been adjusted to operate at a pressure of 1" (25 mm) pressure. Input No.
22 should be ON when the combustion air fan is ON, and be OFF when combustion air
pressure is not present. In the operation sequence, the PLC tests this switch for Error
436. If the switch is stuck closed, the burner will not start.
Press RESET to proceed.
STEP 10
-- The +/- selector switch is now used to test the ignition transformer. The
Combustion Air Fan also turns on for 5 seconds at start of this step. Turning the switch to
“+” turns on the ignition transformer IGT. Hold the IGT on for several seconds while
observing the flame light on the local panel. The flame light must remain OFF with the
spark ON or the PLC will, during the operating sequence, shut down the burner with
Error 455. If the flame light in ON, the orifice disk in the Flame Scanner FS is missing or
the orifice is too big.
Press RESET to proceed.
During the following three steps, if a safety test fails, the heater will shut down and exit
the test sequence. No ERROR or ALARM will be displayed. To find out which ERROR
created the shut down, start the heater normally and see if the ERROR occurs again.
STEP 11
-- This step is for internal tests and trial for ignition. As soon as the burner
ignites, the program automatically steps to 12.
STEP 12
-- The burner will run for 10 minutes. Test may be terminated early by turning
either stop switch. Set desired AFTER MIX-POINT Temperature on the 20000 Remote
Control. After a short time, the BEFORE and AFTER MIX-POINT Temperatures should
stabilize.
To exit the test program, kill power or press RESET and turn the +/- selector switch
at the same time. The STATUS light should stop blinking when the test program is
terminated.
To operate the burner normally, turn either START (
l
) switch and release.