Gas Piping - Harsco Industrial P-K THERMIFIC N700 Installation & Owners Manual

3.5.6 Venting for Multiple Boilers
The venting instructions in this manual apply to a single boiler.
Venting systems for multiple boilers must be designed by experienced and knowledgeable professionals.
The venting system must prevent backflow of exhaust gas through idle boilers.
3.5.7 Removing an Existing Boiler
(from a common venting system)
When an existing boiler is removed from a common venting system, the common venting system is likely
to be too large for proper venting of the appliances remaining connected to it.
At the time of removal of an existing boiler, while the other appliances remaining connected to the
common venting system are not in operation, the following steps should be followed with each appliance
remaining connected to the common venting system placed in operation:
1. Seal any unused openings in the common venting system.
2. Visually inspect the venting system for proper size and horizontal pitch and determine that there is no
blockage or restriction, leakage, corrosion or other deficiency which could cause an unsafe condition.
3. Insofar as is practical, close all building doors and windows and all doors between the space in which
the appliances remaining connected to the common venting system are located and other spaces of
the building. Turn on clothes dryers and any appliances not connected to the common venting
system. Turn on any exhaust fans, such as range hoods and bathroom exhausts, so they will
operate at maximum speed. Do not operate a summer exhaust fan. Close fireplace dampers.
4. Place the appliance being inspected in operation. Follow the lighting instructions. Adjust the
thermostat so that the appliance will operate continuously.
5. Test for spillage at the draft hood relief opening after 5 minutes of main burner operation. Use the
flame of a match or candle or smoke from a cigarette, cigar or pipe.
6. After it has been determined that each appliance remaining connected to the common venting
system 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.
Any improper operation of the common venting system should be corrected so the installation conforms
with the National Fuel Gas Code, NFPA 54/ANSI Z223.1. When resizing any portion of the common
venting system, the common venting system should be resized using the appropriate tables in Part II of
the National Fuel Gas Code, NFPA 54/ANSI Z223.1.
3.6 G P
AS IPING
Before making the gas hook-up, make sure the boiler is being supplied with the type of fuel shown on the
boiler nameplate located on the back of the boiler.
The boiler shall be installed such that the gas ignition system components are protected from water.
Gas supply pressure must be between 5" and 14" W.C. for natural gas and between 7" and 14" W.C. for
propane. A low pressure option is available for natural gas through your local representative. If the
available gas pressure exceeds 14" W.C., an additional intermediate gas pressure regulator of the "lock
up" type must be provided to reduce the pressure to less than 14" W.C.
P-K THERMIFIC
26
®
Gas-Fired Boiler