Service manual

SC Series Boilers – Installation and Service Manual
6
• This boiler must be installed such that gas ignition system components are protected from water
(dripping, spraying, rain, etc.) during appliance operation and service (circulator replacement,
condensate trap, control replacement, etc.).
• Structure through which venting will pass must be free and clear for opening (i.e. no hidden conduit,
telephone cables or other obstructions).
2.4 GAS SERVICE PIPING
Make sure the gas on which the boiler will operate is the same as that specified on the boiler rating plate.
Do not install the boiler if equipped for a different type gas. Consult your gas supplier to get gas
information.
To prevent damage, care must be taken not to apply too much torque when attaching gas supply pipe to
gas valve gas inlet. Use a wrench on the square ends of the gas valve to hold it when connecting the gas
supply pipe.
The boiler and its gas connection must be leak tested before placing the boiler in operation. The gas
controls furnished are suitable for a maximum operating gas pressure of 1/2 psi (14 inches water
column).
The boiler and its individual shutoff valve must be disconnected from the gas supply piping system during
any pressure testing of that system at test pressures in excess
of 1/2 psig (14 inches water column).
The boiler must be isolated from the gas supply piping system by closing its individual manual shutoff
valve during any pressure testing at test pressures equal to or less than
1/2 psig (14 inches water
column).
A manual main shut-off valve must be installed in the gas line outside the boiler jacket and as required in
Section 2.2. The valve should be readily accessible for turning on and off.
A drip pocket or sediment trap must be installed in the gas supply line upstream of the gas controls and
as close to the boiler as possible (example shown in Figure 3 in Section 6).
The pipe compound used should be resistant to the action of liquefied petroleum gases. Check for gas
leaks in piping before placing the boiler in operation by using a soap and water solution. Also check the
gas leaks of the joint between the gas valve outlet and manifold when the boiler is on. DO NOT USE AN
OPEN FLAME.
INSTALLER MUST IDENTIFY EMERGENCY SHUT-OFF DEVICES.
All piping and fittings must be installed as per codes in Section 2.2.
2.5 CORROSIVE ATMOSPHERES
If a gas boiler is to be installed near a corrosive or potentially corrosive air supply, the boiler should be
isolated from it and outside air should be supplied as recommended in Section 2.6.
Chemical vapors from products containing chlorine or fluorine must be avoided. Even though these
chemicals may be safe to breathe, corrosive substances can become liberated when passed through a
gas flame. Even at low concentrations, these chemicals can significantly contaminate the air supply and
shorten the life of any gas-fired appliance. The following is a list of some of the products which should be
avoided:
• bleaches and chlorinated cleaning products
• paints and sprays
• water softeners (calcium or sodium chloride)
• leaking refrigeration equipment
• freon from common aerosol dispensers