INSTALLATION & MAINTENANCE MANUAL FOR
DO NOT try to light
THE FIRE DEPARTMENT
DO NOT store or use gasoline or
other flammable vapors and
liquids in the vicinity of this or
maintenance can cause injury or
MAXIM
INTEGRATED WATER HEATING SYSTEM
TABLE OF CONTENTS
Start-up Procedures 2
Maintenance & Safety Inspections 3-5
Wiring Diagrams 6,7
Burner 8
Burner Start-up 9-12
Burner Troubleshooting 13.14
MXG Burner Manual Refer to PV500-21A
MXO Burner Manual Refer to PV500-22A
FOR YOUR SAFETY
WHAT TO DO WHEN YOU
SMELL GAS:
•
any appliance.
• DO NOT touch any
electrical switch; DO NOT
use any phone in your
building.
• IMMEDIATELY call
your gas supplier from a
phone outside the
building. Follow the gas
supplier’s instructions.
• If you cannot reach
your gas supplier, CALL
FOR YOUR SAFETY
.
any other appliance.
FOR YOUR SAFETY
WARNING: Improper
installation, adjustment,
alteration, service, or
property damage. Refer to this
manual for assistance, or
consult a qualified installer,
service agency, or the gas
supplier.
TYPICAL CONSTRUCTION
FIGURE 17-1
1. VENT STACK * 8. HANDHOLE CLEANOUT
2. TEMPERATURE LIMITING DEVICE (set at 200°F) 9. UPPER OPERATING THERMOSTAT (set at 130°F)
3. OPERATING THERMOSTAT (set at 120°F) 10. COLD WATER INLET & RETURN CONNECTION
4. CONTROL SWITCH(es) AND FUSE(s) 11. DRAIN
5. GAS VALVE 12. RELIEF VALVE
6. GAS INLET 13. PRIMARY SAFETY CONTROL
7. BURNER 14. DIFFERENTIAL AIR PROVING SWITCH
CAUTION: Temperatures higher than 130°F increase the risk of scald injury!
IMPORTANT! Clearance to unprotected combustible material must be 8” min. at top, sides and rear, and 24” min. in front.
(* NOT FURNISHED BY PVI)
PV500-17 05-2000 Section 17
MAXIM
1
START-UP PROCEDURES
CAUTION: DO NOT RELIGHT PILOT OR START BURNER WITH COMBUSTION
CHAMBER FULL OF GAS OR OIL VAPOR, OR WITH VERY HOT
COMBUSTION CHAMBER.
1. Study the burner start-up information
included in this manual carefully.
2. Fill the water heater tank with water. Open
the relief valve or a nearby hot water faucet
to allow air in the tank to escape. Be sure
all connections into the tank are tight as
leaks at tank fittings will damage the
insulation.
3. The top thermostat is a temperature
limiting safety device set at 200°F. The
thermostats are set at the factory at 130°F
on the upper operating thermostat and
120°F on the lower operating thermostat.
Adjustment may be made by turning the
thermostat dial to the desired temperature.
CAUTION: TEMPERATURES HIGHER THAN 130?F INCREASE THE RISK OF
SCALD INJURY.
CAUTION: CONDUCT THE FOLLOWING GAS TRAIN LEAKAGE TEST BEFORE
START-UP, ANNUAL INTERVALS AND PRIOR TO INVESTIGATING THE
CAUSE OF ANY REPORTED OCCURRENCES OF DELAYED IGNITION.
1. Using an appropriate bubble detection
solution, thoroughly coat all gas train pipe
connections. If any bubbles are detected,
the leaking connection must be tightened,
recoated and rechecked to assure
stoppage of the leak.
2. Attach a manometer, to measure gas
pressure, at the manual gas shutoff valve
located just upstream of the gas train.
Adjust gas train inlet pressure to the
specified value (e.g. 14 in. W.C.), and
tightly close the gas train manual shutoff
valve closest to burner.
3. Reattach the manometer to the gas
train manual shutoff valve at the burner
and record the measured gas pressure in
inches of water column (in W.C.). Measure
gas pressure again after 15 minutes. If gas
pressure has increased 0.5" W.C. or more,
the gas leak must be isolated to one or
more of the operating gas valves, for
example, a solenoid actuated gas shutoff
valve. After any leaking valve is replaced,
the reassembled gas train must be leak
tested again before start-up is attempted.
(NOTE: All gas valves removed because of
suspected leakage must be returned to PVI
Customer Service for disposition.)
PV500-17 05-2000 Section 17
2
MAXIM
MAINTENANCE AND SAFETY INSPECTIONS
1. Establish a preventive maintenance program to
assure a longer water heater life.
2. The tank should be flushed at two- or threemonth intervals depending on water conditions
in your location. To flush, turn off electrical
disconnect switch to prevent the burner from
operating. Open the drain valve and allow
water to flow through the tank until it runs clear.
Close the drain valve and turn the electrical
switch back on. Draining two or three gallons
from the bottom of the tank on a weekly basis
will also help prevent the accumulation of
sediment. Water impurities consist of fine
particles of soil or sand which will settle out
and form a layer of sediment on the bottom of
the tank.
3. A scale of lime will normally form during
operation and will accumulate on the bottom of
the tank. Lime is formed from the natural
chemicals in the water which precipitate out
during heating cycles. Some water supplies
contain more of these chemicals than others
and scale buildup will occur more rapidly.
Other factors affecting scale buildup are the
amount of hot water used and temperature of
the water. The more hot water used, the
CARBON MONOXIDE WARNING:
CAUTION: IMPROPER COMBUSTION MAY CAUSE SERIOUS INJURY.
PVI recommends a seasonal or annual combustion check-out be performed by a
qualified service agency to ensure safe and efficient operation.
Periodic Inspection of Operational Components
Periodic inspection and check-out of the burner ignition, control system, and fuel valve operation
(for tight close-off) should be made. Refer to the burner installation instruction for
recommendations.
1. Examine the venting system at least once each
year for proper connections, alignment and
corrosion. The blower inlet will collect dust
from the air during operation. Disconnect the
power to the heater and clean the blower
wheel when necessary.
more fresh water containing scale-forming
chemicals is brought into the tank. As the
temperature of water increases, the rate of
scale deposition will be increased.
4. The tank will have a handhole for inspection
and cleaning. (See Figure 17-1, page 1.) To
inspect tank for scale buildup, remove the
handhole cover. If scale is present, it can be
loosened with a high pressure stream of
water. The smaller pieces can be flushed
through the drain and the larger pieces
removed by hand through the handhole. The
frequency of inspections will be determined
by the rate of scale buildup. Intervals of 3060 days is recommended.
5. If a firetube leaks for any reason, consult
factory for instructions.
NOTE: Condensate coming from the tubes on
a cold start is normal and does not
indicate a leaking tube.
6. Regularly inspect the bottom tubesheet.
Inspect the SCALEGUARD tubesheet
insulator for holes or areas that may have
pulled away from tubesheet. Repair or
replace as required.
Inspect all parts and make replacements when
necessary. Check wiring for loose connections
and burned wires.
PV500-17 05-2000 Section 17
3
MAXIM
MAINTENANCE AND SAFETY INSPECTIONS (continued)
Periodic Inspection of Operation Components (continued)
CAUTION: THE RELIEF VALVE IS A PRIMARY SAFETY DEVICE.
2. The temperature and pressure relief
valve may be checked by slowly lifting the
seat lever on top of the valve to determine
its condition for safe operation. The
openings inside the valve may become
restricted by a buildup of scale and
become inoperative. If the valve does not
open and close properly when tested, it
must be replaced. Replace the relief valve
with like kind or one meeting the
requirements stated on the rating decal
located adjacent to the relief valve.
3. A table of periodic safety inspections
is an attachment of this manual for ease of
reference by the building service technician
or licensed equipment operator. Since
water
Instructions for Taking Water Heater Out of Service
Extended shutdown of the appliance and
restarting are as follows:
A. Turn off all power and fuel supplies.
B. Drain and flush tank as previously
discussed.
ELECTRICAL
1. Wiring to the unit should conform to the
National Electrical Code or the code
legally authorized in your locality. A fused
disconnect switch should be used for
water heater control. Service wiring
connections of 120V, 1 phase, 60 Hz. are
located in the enclosure on the water
heater.
heater designs vary, only some of these
listed inspections may be appropriate for
your particular model.
4. PVI strongly recommends the
recording of significant events, such as
maintenance or repair actions and safety
inspections, and encourage the
preparation of an event log for this
purpose. All recorded events should be
dated, fully described, and signed by the
individual performing the service, repair, or
inspection. (See Table 17-1, page 5 for
sample of Inspection Record.)
CALL YOUR PVI CUSTOMER SERVICE
REPRESENTATIVE IF YOU HAVE ANY
QUESTIONS. (1-800-433-5654)
C. Tag power switch(es) that fuel is off and
tank is empty.
D. Refill tank with water and turn fuel and
power switch(es) on to restart. Reset all
controls and conduct start-up of the
appliance as discussed in the previous
pages.
NOTE: Use only copper wire of proper
sizing for incoming service. Damage
resulting from use of aluminum wiring
will be excluded from coverage under
the warranty of this unit.
PV500-17 05-2000 Section 17
4
MAINTENANCE & SAFETY INSPECTION REPORT
DATE
BURNER
INSPECTION
COMBUSTION
ANALYSIS
TANK
INSPECTION
TANK FLUSH
& CLEANOUT
TANK FITTING
INSPECTION
VENT
INSPECTION
THERMOSTAT
INSPECTION
GAS TRAIN
LEAK TEST
Recommended
Inspection
Intervals
YEARLY 6 MONTHS 6 MONTHS 3 MONTHS 6 MONTHS YEARLY YEARLY YEARLY
TABLE 17-1
NOTE: Burner Inspection and Combustion Analysis should be done by a factory authorized service person.
PV500-17 05-2000 Section 17
5
MAXIM
AXIAL FLOW GAS BURNER
CARBON MONOXIDE WARNING:
CAUTION: IMPROPER COMBUSTION MAY CAUSE SERIOUS INJURY.
PVI recommends a seasonal or annual combustion check-out be performed
by a qualified service agency to ensure safe and efficient operation.
TYPICAL CONSTRUCTION
FIGURE 17-2
1. FAN HOUSING 9. AIR PROVING SWITCH
2. AIR DAMPER 10. DAMPER ADJUSTMENT KNOB
3. GAS NOZZLE ASSEMBLY 11. MANUAL SHUTOFF VALVES
4. PRESSURE PLATE 12. GAS PRESSURE REGULATOR
5. BLAST TUBE & BURNER HOUSING JUNCTION 13. GAS VALVE
6. IGNITION TRANSFORMER 14. AUXILIARY GAS VALVE
7. IGNITION ELECTRODE 15. MAIN GAS TRAIN
8. FLAME SENSING ROD 16. ELECTRODE CLAMP
PV500-17 05-2000 Section 17
6
MAXIM
AXIAL FLOW GAS BURNER START-UP
(Refer to Figure 17-2, page 6 to identify burner parts)
1. Remove the enclosure panel cover on
the water heater or boiler to expose the
control circuit. A wiring diagram, included in
this packet, will show the controls used in
our circuitry.
2. Visually check that all components are
intact and no damage has occurred during
transit.
3. Check all connections within the control
cabinet. A loose connection could cause
intermittent shutdowns.
4. Some burners will use direct spark
ignition. They may use a single gas
pressure regulator and gas valve or multiple
valves and regulators. On a call for heat, the
motor starts, the gas primary control is
energized, and after a short delay (prepurge) the gas valve(s) opens and ignition
should occur.
NOTE: Do not tamper with or readjust
program dipswitch settings. This will
cause the control to become inoperable.
Damage resulting from tampering will be
excluded from coverage under the
warranty of this unit.
5. Remove the flame safeguard control
from its base. Check the connections in
control mounting base; loose connections
can cause nuisance shutdowns. Check the
time card or programmer, when applicable,
for good connection.
NOTE: Always secure gas lines and tag "Out
of Service" before servicing burner
nozzle or electrodes.
6. Pull the nozzle assembly to check the
flame and ignition electrodes. This is done
by first disconnecting the gas train by
breaking at the unions. Then removing the
nozzle assembly which will have the
electrodes and pressure plate attached.
Disconnect the electrode wires and take
care not to damage the insulation on the
electrodes.
7. With the electrodes exposed, check them
for the proper settings as called for in
Figure 17-3, page 8. Check for any hairline
cracks in the insulators. Should
replacement of burner electrodes be
required, certain procedures must be
followed. In all cases, removal of the
electrodes is accomplished by loosening
the electrode mounting clamps. Draw the
electrodes out of the nozzle assembly
through the holes in the pressure plate.
8. Inspect the electrodes for cracked ceramic
or loose retaining studs that hold the wire
within the ceramic. Select the proper
pressure plate hole to place each electrode
and insert the electrode through the hole,
retaining stud end first.
9. Tighten electrode mounting clamp slightly
until electrode ceramics are seated firmly
and completely in the mounting bracket
without gaps between ceramics and
mounting bracket at the bearing faces.
10. Measure and set electrodes according to
Figure 17-3, page 8. After the gaps and
setting are complete, fully tighten the
electrode mounting clamp. Do not
overtighten or the insulation may crack.
11. Replace nozzle assembly; be sure to
connect the flame and spark rod wires
before installing nozzle assembly fully into
blast tube. Check connectors on the ends
of the flame and spark rod wires for good
contact. Look for properly stripped wire
ends. Be sure connectors are firmly
attached to the flame and ignition rod ends.
Insulating boots can give a false feeling of
proper seating. DO NOT MOVE
ELECTRODES. Be careful not to bump
electrodes. Check fan wheel for free
rotation.
12. Reinstall orifices in unions (if required).
Reinstall gas nozzle assembly.
PV500-17 05-2000 Section 17
7
MAXIM
AXIAL FLOW GAS BURNER START-UP (continued)
PRESSURE PLATE
Set up and Tolerances
13. Connect a test meter to the control for
reading the flame response signal.
NOTE: Some controls read the flame signal
in micro amps and some in volts DC.
The TFM or MC120 series control has
two terminals marked for reading volts
DC. The S89 control uses a micro amp
signal for measuring flame strength. For
this control, a meter must be hooked in
series with the flame rod wire.
Disconnect the leadwire at the S89
sensor terminal. Connect the positive
lead of the meter to the quick-connect
sensor terminal on the S89 and the
negative lead to the free end of the
sensor leadwire.
14. Be sure the tank is filled with water. Once
the burner is reassembled, two devices to
read pressure, preferably U-tube
manometers, will be needed to read gas
pressures. Connect one to read the inlet
pressure of the burner. This is the pressure
measured before all components in the gas
train. The manometer must stay connected
throughout the testing as the inlet pressure
Figure 17-3
must be monitored during the firing of the
burner. Record static pressure; it must not
exceed 14" W.C. Pressures above this could
cause damage to the diaphragm in the gas
valve or pressure regulator.
15. Burners with pilot; inputs over 400,000
Btu/h (See wiring diagram.)
16. Connect a manometer to the manifold test
port at the shutoff valve closest to the
burner. Turn off the main gas shutoff valve.
Set the air shutter as shown on the tag
attached to gas train. This may not be the
exact setting you end up with, but it is a
good starting point. Turn the unit on using
the rocker switch on the side of the control
enclosure assembly. If the operating control
switches are closed, the burner blower
should come on and pre-purge begin.
If nothing happens, check the control to be
sure it is not in the tripped position and reset
it by pushing the flame safeguard reset
button. The burner should pre-purge for no
longer than thirty seconds.
PV500-17 05-2000 Section 17
8
MAXIM
AXIAL FLOW GAS BURNER START-UP (continued)
This section pertains to MC120 control only.
When the blower motor starts, the air proving
light on the MC-120 should be on. This
indicates a positive air flow condition. If the air
proving light is not on, turn air proving switch
adjustment screw counter-clockwise until the air
proving light comes on, then turn screw one
turn counter-clockwise. If the gas valves open
and close intermittently during normal
operation, turn screw one half turn counterclockwise until this condition ceases. This
procedure should be followed with every
burner.
After purging is complete, terminal 3 energizes
the pilot valve and terminal 4 energizes the
ignition transformer on the control. The pilot is
then established. The VDC reading on the
meter should read a steady 14-17 VDC. Each
different control will have the required flame
response signal stamped on it. This is the
minimum for it to properly operate. If the pilot
fails to light during the initial period, it is
probably due to air in the line. The control will
lock out. Wait one minute and push the flame
safeguard reset button to restart burner and
begin the purge cycle again.
Once the flame is established, set the pilot
pressure (measured downstream of gas valve)
at pressure shown on the tag attached to gas
train. Next, open the main gas valve slowly. Set
manifold pressure at pressure shown on the tag
attached to gas train. Do not screw the
adjusting nut of the regulator in past the point
where no further increase in manifold pressure
is noted. Check the incoming pressure with the
burner running. This is recorded as inlet flow
pressure.
Our standard flow pressure requirement on
these burners is 8" W.C. flow. If the required
manifold cannot be reached, check the inlet
pressure. It should be a minimum of that shown
on the heater decal with the burner running on
full input. It is important that the incoming
pressure does not fall below these minimums
or nuisance control lockouts could occur.
NOTE: Where low gas pressure is a
problem, special arrangements may have
been made to fire the burner with reduced
pressure. The appliance data decal will
reflect this information.
16. Direct Spark Ignition - (DSI) Burners
- No pilot. (See wiring diagram.)
Connect manometer to the manifold test port.
Set the air shutter as shown on the tag
attached to gas train. This may not be the
exact setting you end up with, but it is a good
starting point.
Turn the unit on, using the rocker switch on
the side of the control enclosure assembly.
The burner should come on and ignition
occur. If the burner fails to ignite, there may
have been air in the line. To reset the control,
turn the switch off for 60 seconds (S89
controls only) and it should automatically
reset, or push the reset button on the control.
If after the appropriate prepurge, ignition
does not occur, turn air proving switch
adjustment screw counter-clockwise until TFI
(try for ignition) occurs. Now in order to more
precisely adjust the air failure set point,
slowly turn screw clockwise until the burner
shuts off. Then turn screw counter-clockwise
one turn. If the gas valves open and close
intermittently during normal operation, turn
screw one half turn counter-clockwise until
this condition ceases.
Once the burner fires, set manifold pressure
at pressure shown on the tag attached to gas
train. There will be a tap on the downstream
side of the valve to measure pressure. The
manifold pressure must be taken
downstream of the gas valve. Check the
incoming pressure with the burner running.
This recorded flow pressure must be the
minimum specified on the heater decal.
PV500-17 05-2000 Section 17
9
MAXIM
AXIAL FLOW GAS BURNER START-UP (continued)
17. Check flue gases with a flue analyzer to make
final settings of the air shutter.
a. The readings need to be taken from a
hole in the vent several inches above the
heater vent connection, but before draft
regulator.
b. Insert draft gauge into the 1/4" test
opening in the stack. Draft in stack should
read -.02" to -.06" W.C. Adjust draft
regulator, if installed.
c. When water in the tank is above 120?F,
insert analyzer or O2 tester in 1/4" test
opening and take O2 reading in
percentage.
d. Gradually close air shutter, taking O2
reading at each adjustment of air shutter
until optimum O2 % (4-6%) is reached. If
O2 % decreases, open air shutter to last
reading where the greatest reading is
achieved.
e. Insert CO tester in 1/4" test opening and
take CO reading. CO should not exceed
.03%. A reading greater than .03%
indicates lack of air. Open air shutter
slightly and take readings until CO is
within proper range. Optimum reading is
no CO.
f. If air shutter was changed during CO test,
take a final O2 reading.
g. Insert CO2 tester in 1/4" test opening;
record in percentage.
h. Insert stack temperature gauge in 1/4"
test opening and read gross stack
temperature; maximum gross stack is to
be 450°F, minimum net stack is to be
300°F. (NOTE: net temperature is the
total stack temperature, less room
temperature.) If an excessively high
gross stack temperature is recorded,
check the flue tubes for turbulators.
i. Make sure the air shutter is locked
securely in place.
18. On burners with pilots, recheck pilot to
make sure its operation has not
deteriorated if adjustments are made to the
air shutter. To do this, shut off the main
valve, check the flame response signal by
cycling the burner through several lightoffs.
19. Check each operating and limit control to
be sure they function properly by lowering
and raising the temperature setting on
each control, causing the burner to cycle
on and off.
NOTE: During the initial firing of the burner,
smoke that is not related to the burner
will be emitted from the heater. This is
normal during "burn in" and could
possibly continue for several hours.
20. Record the following information for future
use:
A. Air shutter position________________
B. Manifold gas pressure________"W.C.
C. Stack draft_________________"W.C.
D. O2 reading_______________%(4-6%)
E. CO2 reading______________%(8-9%)
F. CO reading________%(less than .03%)
G. Stack temperature:
Gross _______________________°F.
Less ambient__________________°F.
Net__________________________°F.
H. Combustion efficiency___________%
PV500-17 05-2000 Section 17
10
MAXIM
TROUBLESHOOTING SUGGESTIONS
AXIAL FLOW GAS BURNER
1. BURNER FAILS TO START
Defective On/Off switch. Replace switch.
A. Control circuit has an open control
contact. Check limits, low water cutoff, proof
of closure switch and others as applicable.
B. Bad fuse or switch open on incoming
power source. Correct as required.
C. Flame safeguard control safety switch
tripped out. Reset and determine cause for
apparent flame failure.
D. Loose connections or faulty wiring.
Tighten all terminals screws and consult
wiring diagram furnished with the burner.
E. Flame safeguard control starting circuit
blocked due to flame relay being
energized. Possible defective scanner or
flame rod - replace. Possible defective
amplifier - replace. Scanner actually sighting
flame due to leaking fuel valve - correct
unwanted flame cause. Defective flame
safeguard control - replace.
F. Defective blower motor. Check for free
rotation of fan wheel. Repair or replace.
G. Air proving switch is not properly
adjusted. See Section 15, page 11.
2. OCCASIONAL LOCKOUTS FOR NO
APPARENT REASON
A. Gas pilot ignition failure. Check to see that
ignition is instant and that flame signal
readings are stable and above minimum
values. Use a manometer or 0 to 10" W.C.
gas pressure gauge to make certain that
pressure is as recommended.
B. Loose or broken wires. Check all wire nut
connections and tighten all terminal screw
connections in panel and elsewhere as
appropriate.
C. With flame safeguard controls that
incorporate the air flow switch in the nonrecycling circuit, ensure that when main
flame lights, the air flow switch is not so
critically set as to allow occasional
momentary opening of the air switch
contacts.
D. Occasional low voltage supply. Have local
utility correct. Make certain the burner control
circuit transformer (if supplied) is correct for
the voltage and power (VAC) being supplied.
E. Occasional low gas supply pressure.
Have local utility correct.
3. BURNER MOTOR RUNS, BUT PILOT DOES
NOT LIGHT
A. Gas supply to burner shut off. Make sure
all manual gas supply valves are open.
Automatic high pressure valve at meter such
as "Sentry" type tripped shut due to high gas
pressure. Reset valve and correct cause for
trip out.
B. Pilot solenoid valve not opening. Listen
and feel for valve actuation. Solenoid valve
not being powered. Check electrical circuitry.
Replace coil or entire valve if coil is burned
out.
C. Defective gas pilot regulator. Replace.
D. Gas pressure too high or too low at pilot
orifice (if supplied). Check orifice size in gas
pilot assembly. Replace if incorrect. Readjust
pressure as required.
E. Defective ignition transformer. Replace.
Incorrect ignition electrode settings.
Readjust as required.
F. Defective flame safeguard control or plug
in purge timing card. Replace as required.
G. Air flow switch not making circuit. Check
out electrically. Defective air flow switch-
replace. Air switch negative pressure
sensing tube out of position-reposition as
necessary.
4. BURNER MOTOR RUNS & PILOT LIGHTS, BUT
MAIN GAS FLAME IS NOT ESTABLISHED.
A. Main shut off or test cock closed. Check to
make certain fully open.
B. Pilot flame signal reading too low to pull in
flame safeguard relay. Readjust as required.
PV500-17 05-2000 Section 17
11
MAXIM
TROUBLESHOOTING SUGGESTIONS
AXIAL FLOW GAS BURNER (continued)
C. Defective automatic main or auxiliary gas
shut off valves. Check electrical circuitry to
valves. Replace valves or correct circuitry as
required.
D. Main diaphragm shut off valve opening too
slowly. Adjust bleed on valve.
E. Defective flame safeguard control or plug on
amplifier. Check and replace as required.
F. Main gas pressure regulator atmospheric
vent line obstructed. Correct.
G. Defective main gas pressure regulator.
Replace. Misadjusted main gas pressure
regulator. Readjust to meet required
operational values.
H. Polarity reversed on incoming power. (S89
control only)
5. CARBON MONOXIDE READINGS ON GAS FIRING
A. Flame impingement on "cold" heat transfer
surfaces caused by excessive firing rate.
Reduce firing rate to correct input volume.
B. Incorrect gas/air ratios. Readjust burner to
correct CO2/O2 levels, eliminated all CO
formation.
6. GAS HIGH FIRE INPUT CANNOT BE ACHIEVED
A. Gas company pressure regulator or meter
operating incorrectly, not allowing required
gas pressure at burner train inlet. Contact gas
company to correct.
B. Gas cock upstream of train inlet not fully
open. Check and correct.
Additional troubleshooting information can be found in the Flame Safeguard bulletin supplied with the burner.
C. Gas line obstructed. Check and correct.
D. Gas train main and/or lead test cocks not
fully open. Check and correct.
E. Gas supply line between gas company
regulator and burner inlet too small. Check
supply pressure at meter, determine pressure
drop and increase line size as required, or raise
supply pressure to compensate for small line. Do
not raise pressure so high that under static (no
flow) conditions the pressure exceeds the
maximum allowable pressure to the gas train
components on the burner.
F. Burner gas train components sized too small
for supply pressure. Increase component size
as appropriate or consult factory.
G. Automatic gas valve not opening fully due to
defective operation. Replace gas valve.
H. Orifice (if supplied) too small. Replace with
correct size.
I. Defective main gas pressure regulator.
Replace.
J. Incorrect spring in main gas pressure
regulator. Replace as required.
K. Main gas pressure regulator vent line
obstructed. Check and correct.
L. Normally open vent valve (if supplied) not
closing when automatic gas valves open.
Check to see if valve is fully closed when
automatic valves are open. Replace vent valve,
if not closing fully.
PV500-17 05-2000 Section 17
12
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