At the time of removal of an existing heater, the follow- ing steps shall be followed with each appliance remaining connected to the common venting system placed in operation, while the other appliances remain- ing connected to the common venting system are not in operation.
(a)Seal any unused openings in the common venting system.
(b)Visually inspect the venting system for proper size and horizontal pitch and determine there is no blockage or restriction, leakage, corrosion and other deficiencies which could cause an unsafe condition.
(c)Insofar as is practical, close all building doors and windows and all doors between the space in which the appliances remaining connected to the com- mon venting system are located and other spaces of the building. Turn on clothes dryers and any appliance not connected to the common venting system. Turn on any exhaust fans, such as range hoods and bathroom exhausts, so they will oper- ate at maximum speed. Do not operate a summer exhaust fan. Close fireplace dampers.
(d)Place in operation the appliance being inspected. Follow the lighting instructions. Adjust thermostat so appliance will operate continuously.
(e)Test for spillage at the drafthood relief opening after 5 minutes of main burner operation. Use the flame of a match or candle, or smoke from a ciga- rette, cigar or pipe.
(f)After it has been determined that each appliance remaining connected to the common venting sys- tem properly vents when tested as outlined above, return doors, windows, exhaust fans, fireplace dampers and any other gas burning appliance to their previous conditions of use.
(g)Any improper operation of the common venting system should be corrected so the installation conforms with the latest edition of the National Fuel Gas Code, ANSI Z223.1/NFPA 54. When re- sizing any portion of the common venting system, the common venting system should be
For special venting applications that require reduced vent sizes and through the wall venting, the optional D Series Power Vent can be used. Consult the factory or your local Raypak representative.
8
Gas Supply Connections
Gas piping must have a sediment trap ahead of the heater gas controls, and a manual
MANUAL
VALVE
SEDIMENT 
TRAP
Fig. 5: Gas Piping
CAUTION: The heater and its manual
CAUTION: Do not use Teflon tape on gas line pipe thread. A pipe compound rated for use with natural and propane gases is recommended. Apply sparingly only on male pipe ends, leaving the two end threads bare.
A minimum of 7 in. WC and a maximum of 10.5 in. WC upstream pressure under load, and no load conditions must be provided for natural gas or a minimum of 11 in. WC and a maximum of 13 in. WC for propane gas.
Gas Pressure Regulator
The gas pressure regulator is preset and sealed at 4 in. WC for natural gas, and 11 in. WC for propane gas. Between the gas valve and the burners is a 1/8" pipe plug. The pressure at this point, taken with a manome- ter, should be about 3.7 in. WC natural gas and 10.5 in. WC propane gas. If an adjustment is needed, remove seal and turn adjustment screw clockwise
, to increase pressure or 
, to decrease pressure.
