Installation and service personnel may be required to be licensed in some states. Persons not qualified shall not attempt to install this equipment nor attempt repairs according to these instructions. DANGER - SHOCK HAZARD Make sure electrical power to the heater is disconnected to avoid potential serious injury or damage to components. DANGER - PROPANE HAZARD Make sure to determine if unit is propane and see special instructions on page 6. SCOPE: This version of the temperature control bo

— WHAT TO DO IF 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 supplier from a neighbor's phone. Follow the gas supplier's instructions. • If you cannot reach your gas supplier, call the fire department. — Installation and service must be performed by a qualified installer, service agency or the gas supplier. Atmospheric Models 206A, 266A, 336A and 406A Low NOx Models 207A, 267A, 337A and

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 P

**WARNING: The Hydraulic conditions or water chemistry that caused the tube bundle to fail have very likely also damaged the bypass valve and Unitherm Governor. We recommend you replace the Unitherm Governor and inspect the bypass assembly. Failure to do so could cause premature failure of this replacement part. 51 ATMOSPHERIC HEATERS CALL OUT DESCRIPTION 206A 266A 336A 406A HM HEAT EXCHANGER - METAL 1-HM Heat Exchange Assy.Copper ASME CI 010051F 006727F 010053F 010054F Heat Exchange Assy.Cupro

Check movement by putting in hot water (110°F or higher). If no movement, replace. Locate the restriction and remove. Flush system and clean. Remove debris or blow out gas line. Scale forming in heat exchanger - clean heat exchanger and check pool pH and total alkalinity. Heater going on and off continuously Dirty filter.............................................. Low water level in pool........................ External bypass setting out of adjustment..........................................

See external bypass valve section for details. POLYMER HEADERS Fig.# 2012 CAST IRON HEADERS (ASME) 21 POLYMER HEADERS (STANDARD MODELS) Before attaching the 2-inch unions to the inlet/outlet header, make sure the O-rings are properly seated in the grooves. Use AquaLube or equivalent non-petroleum- based lubricant on the O-ring. Hand tighten the unions. Glue PVC piping directly to the unions. GASKET DESIGN #1: Accepts 1-1/2" copper tube or 1-1/4" galvanized pipe as a slip connection. GASKET DESIG

It will then monitor the water tem- perature and turn the heater back on when it senses that the water temperature is falling below the set point. It is normal to experience small fluctuations in the return water temperature during the operation of the heater. The thermostat is calibrated with a very narrow tolerance to ensure accuracy of the set temperature. Thus, slight fluctuations in water temperature may cause your heater to cycle on and off frequently. This is not a problem. It will not ha

Refer to the latest revisions of CAN/CGA-B149.1 and B149.2. 4 ft Minimum 4 ft Minimum 1 ft Minimum 4 ft Minimum 3 ft Minimum 10 ft Minimum Forced Air Inlet For installations in Florida, that must comply with the Florida Building Code 2001, follow the directions on p14 for the installation of hurricane tie-down brackets for all models. 13 14 FLORIDA BUILDING CODE 2001 WIND SPEED = 150 MPH, 3 SECOND GUST EXPOSURE = C HOT B 28” 40” 3” Min. Conc. Pad by others 3” Min. Conc. Pad by others Min. Edge D

Otherwise, rapid and severe damage will likely occur to the heater. (The water pressure switch should be checked and adjusted for proper operation by a qualified service person at the time of installation and periodically checked thereafter. Refer to Pressure Switch Adjustment on pg. 37 of this manual). Elevated water temperature can be hazardous. The U.S. Consumer Product Safety Commission has these guidelines: 1. Spa water temperatures should never exceed 104°F (40°C). A temperature of 100°F (

Such substitutions would jeopardize the safety and health of inhabitants. The Stainless Steel non-restricted direct vent cap must be furnished by the boiler manufacturer in accordance with AGA/CGA requirements. 47 Outdoor Installation with Add-On Condensing Heat Exchanger Outdoor models are self -venting when installed with the factory-supplied non-restricted direct vent cap and require no additional vent piping. This special vent cap is provided with the boiler in accordance with AGA/CGA requir