Midco J121A-3 - Manual (Page 4)

CAUTION: If the test pressure is over 0.5 PSIG, the
test must be made without any burner components
connected, including Main and Ignitor Manual Shut-Off
Valves.
WARNING: Explosion hazard.
Do not use oxygen for pressure testing. An explosion
could occur during initial start-up.
VI ELECTRICAL
Installation wiring to the burner must conform to local
codes, or, in their absence in the United States the National
Electric Code ANSI/NFPA No. 70-1990, or latest edition; in
Canada, to CSA standard C22.1, "Canadian Electrical
Code Part 1."
■ Use copper wires and provide disconnect and fuse
protection for each INCINOMITE installation. Refer to
SPECIFICATIONS, page 2, for ampacity. Confirm that the
polarity is correct—hot wire to strip terminal L1, neutral L2
and that the neutral line is not subject to induced low
voltage (check L2 to ground) from other equipment as that
can affect the flame safeguard, causing it to malfunction.
See Flame Safeguard Section X.
CAUTION: In order for the automatic cooling system to
function, power must be maintained to burner strip terminal
L1. Do not install any safety or on-off controls in the circuit
between the fused disconnect switch and strip terminal L1.
Optional remote control devices should be connected in
place of, or in addition to, the switch or timer as indicted in
Figure 2 Wiring Diagram.
NOTE: Optional 0-6 hour Timer may be substituted for the
burner On-Off Switch. Kit is available with full conversion
instructions.
VII INITIAL START UP/ADJUSTMENT
Burners are suitable for use with NATURAL or PROPANE
gas only.
■ If a standard NATURAL gas model is to be used with
P R O PANE gas, a conversion kit is available, which
contains a PROPANE Main Gas Port, a PROPANE Ignitor
Tee Orifice Fitting and a PROPANE label and conversion
instructions.
■ As shipped, the Air Shutter is in the full open position and
the Main Gas Input Adjuster 5 to 6 turns from full closed.
Ignitor regulator is factory set for recommended outlet
pressure of 3.5" W.C. suitable for most applications.
CAUTION: Ignition is automatic. Therefore, make ignitor
or spark observations into incineration chamber only with
Main Manual Shut-Off Valve closed.
1. Check the burner piping and valves for gas leaks by
applying a weak liquid soap solution to unions and
joints with the gas supply on. Leakage will be indicated
by the appearance of soap bubbles. Locate and correct
all gas leaks before proceeding.
WARNING: DO NOT USE OPEN FLAME.
2. Confirm that the main gas Input Adjuster is 5 to 6 turns
from full closed and that the Blower Air Shutter is fully
open.
3. Close the Main Manual Shut-Off Valve and Manual
Ignitor GAs Valve.
4. Purging the air from the gas supply line at this step will
expedite the first light-off.
CAUTION: Purge outside the building. Do not
purge into the incineration chamber.
5. Turn on the Fused Disconnect, Burner Switch or Timer
and press relay reset button. Let motor run long
enough to accomplish four air changes. Note that
motor will continue to run after Flame Safeguard
lockout occurs.
6. Open the incinerator charging door. making sure any
Door Open interlock is temporarily bypassed.
7. Turn on Manual Ignitor Gas Valve only, and press relay
reset button. Trial for Ignitor Ignition: Flame Safeguard
and motor are powered. There will be a delay until
blower reaches operating speed and trips blower
proving switch. When the blower proving switch is
made, the Ignitor Solenoid Valve and Spark Generator
are energized. Ignitor flame should light.
8. If ignitor fails to light during the trial prescribed for
ignition and goes into Flame Safeguard lockout, it is
probably due to air in ignitor gas line. Wait one minute
and
press relay reset button for several relight attempts.
If the ignitor fails to light, turn off Manual Ignitor Gas
Valve and repeat from step 5 above. Then, if necessary,
refer to the Trouble Chart to isolate the problem. (Refer
to Section X for trial timings.)
WARNING: Repeated unsuccessful attempts to
light will result in accumulated gases in incin-
eration chamber and chimney. To prevent these
gases from reaching an explosive level,periodically
purge the incineration chamber as described in
Step 5.
9. Observe the ignitor flame. If it is weak, screw in the
Ignitor regulator adjustment to increase the pressure. If
it is excessively rich and large or floating from the igni-
tor tip, back off the regulator adjustment to reduce the
pressure. Set the ignitor to a stable blue flame which
burns firmly within the ignitor tip. Check flame signal
with a DC voltmeter and adjust Ignitor Regulator
slowly for highest steady 2 or more volts DC.
CAUTION: When adjusting the regulator, take note
of the supply pressure. If gas supply pressure is
below its specified range during adjustment, an
over-fire condition could result when pressure
returns
to normal, particularly if the regulator
adjustment screw is BOTTOMED OUT. ALWAYS confirm
that at least the minimum rated pressure is being
supplied to the ignitor during regulator adjustments,
and NEVER BOTTOM OUT regulator screw. Operate
air shutter throughout range to confirm Ignitor
stability. Try several relights. Refer to Table 4.
10. Remove the Input Adjuster Cap (see Figure 3) and turn
the Main Gas Input Adjusting Screw until the desired
input rating is reached (refer to Tables 2 or 3). Turning
of adjustment screw counterclockwise increases gas
flow; clockwise reduces gas flow. If Main Flame gas
pressure requires adjustment, refer to Section V Piping.
11. Reset the Blower Air Shutter to match the intended
input, i.e.; full open for maximum, closed for minimum
or partially open for midrange. The Blower Air Shutter is
factory set wide open. Adjust as necessary when, with
combustion air available in the incineration chamber, it
is desirable to increase the flame length, or to restrict
the amount of excess air discharged into the incinera-
tion chamber when the burner input is below
450 MBH.
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