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PV500-17 05-2000

Section 17

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

Summary of Contents for MAXIM

Page 1: ...WITCH NOT FURNISHED BY PVI 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 MAXIM FOR YOUR SAFETY WHAT TO DO WHEN YOU SMELL GAS DO NOT try to light any appliance DO NOT touch any electrical switch DO NOT use any phone in your building IMMEDIATELY call your gas sup...

Page 2: ...NVESTIGATING 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 ...

Page 3: ...ndhole 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 30 60...

Page 4: ... 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 Instructions for Taking Water Heater Out of Service...

Page 5: ...SPECTION 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 ...

Page 6: ...ervice 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...

Page 7: ...es 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 i...

Page 8: ...let 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 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 o...

Page 9: ...rners 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 burne...

Page 10: ...pening 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...

Page 11: ...ate the air flow switch in the non recycling 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...

Page 12: ...t B Gas cock upstream of train inlet not fully open Check and correct 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 lin...

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