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If it does not, repeat the above steps. MAY REQUIRE ADJUSTMENT FOR LOWER PRESSURE PRESSURE SWITCH ADJUSTMENT RANGE 5 FT. MAX POOL OR SPA MAY REQUIRE ADJUSTMENT FOR HIGHER PRESSURE 5 FT. MAX Fig.# 8152.3 NOTE: If heater is installed outside of the limits shown, a higher pressure rated (11 psi) switch may be used. Aflow switch, mounted and wired adjacent to the heater, may be used in place of the factory-mounted pressure switch. See Parts List (pg. 51) for 11 psi water pressure switch. TWO-SPEED PUMPS In some cases, the flow on the low-speed is insufficient to operate the heater. This is apparent when the water pressure switch cannot be further adjusted or if the heater makes banging noises or shuts off on high limit. In these cases, the pump must be run at high speed when heating the water. CAUTION: Do not operate the heater without the function of a properly adjusted water pressure switch or flow switch. FLAME ROLL-OUT SAFETY SWITCH Atmospheric heaters are equipped with a thermal cutoff device to prevent flame roll-out in the event the heat exchanger becomes blocked. This is a "singleuse" type fusible link or thermal fuse, that must be replaced when disabled by an over-temperature condition, caused by excessive restriction in the heat exchanger flue passage. Fig.# 9440 HIGH LIMITS The heater is equipped with two automatic high limits. Both are located in the inlet/outlet header. Both are set to open at 135°F. NOTE: An erratic high limit is often characteristic of an internal heat exchanger problem, e.g. scale build-up, defective bypass. Refer to Troubleshooting section (on pg. 42). HIGH LIMIT REMOVAL 1. Shut off main electrical power switch to heater. 2. Remove inlet/outlet inspection panel. 3. Remove defective high limit and replace with a new high limit. Fig.# 9439 4. Replace inspection panel. PILOT SAFETY - Millivolt Models Heaters equipped with the standing pilot (millivolt system) have pilot generators which act as a safety device to shut off the flow of gas to the main burners and the pilot burner in case the pilot flame is extinguished. The pilot burner must be manually re-lighted to place the heater in operation again. Refer to the lighting instructions provided on the heater label. PILOT SAFETY - Digital Models The heater employs a pilot safety which closes the main gas valve within 8/10ths of a second whenever the pilot flame is interrupted. The pilot flame is automatically lit when the device is powered. The heater performs its own safety check and opens the main valve only after the pilot is proven to be lit. 38 39 PILOT REMOVAL AND CLEANING 1. Disconnect pilot tubing and wires from gas valve. 2. Remove pilot assembly from burner tray. 3. Remove pilot from bracket. 4. Remove pilot orifice and air opening (Honeywell MV unit only), and clean with wire or small brush. CAUTION! Do not enlarge hole in pilot orifice. 5. Reverse above procedure to reinstall. Pilot Pilot Air Opening Orifice Orifice Fig. # 8045.1 Fig. # 8102.0 HEAT EXCHANGER REMOVAL 1. Shut water, gas and electricity off, close valves and relieve pressure, then remove relief valve. Remove side inspection panels. 2. Remove top jacket holding screws. 3. Remove rear top panel. 4. Remove screws mounting the rain shield to the rear panel. Also remove the screws that mount the rain shield to the sway brace. Remove rain shield. 5. Remove the four (4) screws holding down the flue collector. Remove the flue collector. 6. Disconnect flange nuts on Inlet/Outlet header, loosen union(s) at gas pipe and slide heater away from piping. 7. Lift heat exchanger straight up using caution not to damage refractory. 8. Reverse above procedure to reinstall. Make sure the insulation strips are properly replaced on top of the refractory retainer. PILOT BURNER BURNER HOLD-DOWN BRACKET GAS ORIFICE GAS VALVE BURNER TRAY REMOVAL - ATMOSPHERIC MODELS 1. Shut off main electrical power switch to heater. 2. Shut off gas upstream of heater. 3. Remove front door. 4. Disconnect gas line from gas valve. 5. Remove (2) screws that mount burner tray to unit, and (2) screws that secure gas valve to jacket. 6. Disconnect wires that terminate at gas valve. 7. Disconnect hi-tension wire from PC board. 8. Slide out burner tray. 9. Reverse above procedure to reinstall. GAS VALVE REMOVAL - ATMOSPHERIC MODELS 1. Shut off gas supply to the heater. Remove gas piping to gas valve inlet. 2. Disconnect wires, pilot tubing and bleed line, if required. 3. Remove burner tray from heater. 4. Turn vertical gas pipe from manifold slightly and unscrew gas valve. 5. Reverse above procedure to reinstall. MAIN BURNER AND ORIFICE REMOVAL - ATMOSPHERIC MODELS 1. Remove burner tray. 2. Remove screws and burner hold-down bracket. NOTE: If the heat exchanger is sooted badly, the burner hold-down bracket and spacer can become distorted from direct-flame impingement and this usually necessitates replacement of these parts. 3. Lift burners from slotted spacers and slide from orifices. Clean with a wire brush...

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