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INITIAL PREPARATION
1. Make sure the solvent cement you are planning to use is designed for the specific application you are attempting.
2. Know the physical and chemical characteristics and limitations of the PVC, PVC cellular core, ABS or CPVC piping
materials that you are about to use.
3. Know the reputation of your pipe and cement manufacturer and their products.
4. Know your own qualifications or those of your contractor. The solvent welding technique of joining PVC, PVC cellular
core, ABS or CPVC pipe is a specialized skill just as any other pipe fitting technique.
5. Closely supervise the installation and inspect the finished job before start-up.
6. Contact the manufacturer, supplier, or competent consulting agency if you have any questions about the application or
installation of PVC, PVC cellular core, ABS or CPVC pipe.
7. Take the time and effort to do a professional job. Shortcuts will only cause you problems and delays in start-up. The
majority of failures in these systems are the result of shortcuts and/or improper joining techniques.
SELECTION OF MATERIALS
PRIMER – It is recommended that Tetrahydrofuran (THF) be used to prepare the surfaces of pipe and fittings for solvent welding.
Do not use water, rags, gasoline or any other substitutes for cleaning PVC cellular core, ABS or CPVC surfaces. A chemical
cleaner such as MEK may be used.
CEMENT – The cement should be a bodied cement of approximately 500 to 1600 centipoises viscosity containing 10-20% (by
weight) virgin PVC material solvated with tetrahydrofuran (THF). Small quantities of dimethylformamide (DMF) may be included
to act as a retarding agent to extend curing time. Select the proper cement; Schedule 40 cement should be used for Schedule 40
pipe. Never use all-purpose cements, commercial glues and adhesives or ABS cement to join PVC or CPVC pipe and fittings.
SAFETY PRECAUTION: PRIMERS AND CEMENTS ARE EXTREMELY FLAMMABLE AND MUST NOT BE STORED
OR USED NEAR HEAT OR OPEN FLAME. ALSO, USE ONLY IN A WELL VENTILATED AREA.
SECTION VII: GAS CONNECTIONS
WARNING
Connect this water heater only to the type of gas as shown on the rating plate. Use clean black iron pipe or equivalent material
approved by local codes and ordinances. (Dirt and scale from the pipe can enter the gas valve and cause it to malfunction).
The inlet gas line must have at least a 3 inch (7.62 cm) drip leg (sediment trap) installed as close to the water heater’s gas
valve as possible. A ground joint union must be installed in the gas supply line, as close to the water heater as possible, to
permit servicing of the water heater. Compounds used on the threaded joints of the gas piping must be resistant to the action
of liquefied petroleum gases/propane gas. DO NOT apply pipe dope to the gas valve inlet and make certain that no pipe dope
has become lodged in the inlet screen of the gas valve. Extreme care must be taken to ensure no pipe dope enters the gas
valve and to avoid excessive torque when tightening the gas supply line to the gas valve. Excessive torque may result in
cracking of the gas valve housing. The suggested maximum torque is 31.5 foot lbs. (4.4 kg-m). The manufacturer of this
water heater will not be liable for any damage or injury caused as a result of a cracked gas inlet as a result of excessive torque.
This water heater and its gas connection must be leak tested before placing the water heater in operation. Check for gas leaks
with a soap and water solution and a brush or a commercial leak detector fluid.
NEVER USE A MATCH OR OPEN FLAME FOR TESTING!
The water heater is not intended for operation at higher than 14 inches (3483.8 Pa) water column (½ psi (3.5 kPa)) supply gas
pressure. Higher gas supply pressures require supplemental reducing service regulation. Exposure to higher gas supply
pressure may cause damage to the gas controls, which could result in a fire or explosion. If overpressure has occurred such as
through improper testing of gas lines or emergency malfunction of the supply system, the gas valve must be checked for safe
operation. Make sure that the outside vents on the supply regulators and the safety vent valves are protected against blockage.
These are parts of the gas supply system, not the water heater.