Laars NEOTHERM NTH Series, Инструкция по установке и эксплуатации

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Page 19
N
EO
T
HERM
Residential Boilers
®
3.F Common Vent Test
NOTE: This section does not describe a method for
common venting units. It describes what must be done
when a unit is removed from a common vent system.
These class IV units require special vent systems and
fans for common vent. See Section “3.D Common
Venting” on page 15, or contact the factory if you
have questions about common venting these units.
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, the following
steps shall be followed with each appliance remaining
connected to the common venting system placed in
operation, while the other appliances remaining connected
to the common venting system are not 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 there is no blockage or
restriction, leakage, corrosion and other deficiencies
which could cause an unsafe condition.
3. Insofar as it 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 appliance 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 in operation the appliance being inspected.
Follow the lighting instructions. Adjust the thermostat
so the unit 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.
7. Any improper operation of the common venting system
should be corrected so that the installation conforms
to the National Fuel Gas Code, ANSI Z223.1/NFPA 54
and/or CSA B149.1, Installation Codes. When resizing
any portion of the common venting system, the com-
mon venting system should be resized to approach
the minimum size as determined using the appropriate
tables and guidelines in the National Fuel Gas Code,
ANSI Z223.1 NFPA 54 and/or CSA B149.1, Installation
Codes.
SECTION 4 GAS SUPPLY AND
PIPING
All Installations must conform to the National Fuel Gas Code
ANSI Z223.1/NFPA54, and/or local codes.
In Canada, the
installation must conform to the latest edition of CSA B149.1
Natural Gas and Propane Gas Installation Code, and/or local
codes. Gas piping should be supported by suitable hangers or
floor stands, not the boiler.
Review the following instructions before proceeding with
the installation.
1. Verify that the unit is fitted for the proper type of gas
by checking the rating plate. Unit will function properly
without the use of high altitude modification at
elevations up to 10,000 feet (3050 m).
2. The maximum inlet gas pressure must not
exceed 13” W.C. (3.2kPa). The minimum inlet gas
pressure is 4” W.C. (1.0kPa).
3. Refer to Table 9 thru Table 13 to size the piping.
4. Run gas supply line in accordance with all applicable
codes.
5. Locate and install manual shutoff valves in
accordance with state and local requirements.
6. A sediment trap must be provided upstream of the
gas controls.
7. All threaded joints should be coated with piping
compound resistant to action of liquefied petroleum
gas.
8. The unit and its individual shutoff valve must be
disconnected from the gas supply piping during any
pressure testing of that system at test pressures in
excess of 1/2 PSIG (3.45kPa).
9. The unit must be isolated from the gas supply system
by closing its individual manual shutoff valve during
any pressure testing of the gas supply piping system
at test pressures equal to or less than 1/2 PSIG
(3.45kPa).
10. The unit and its gas connection must be leak tested
before placing it in operation.
11. Purge all air from gas lines.
WARNING
Open flame can cause gas to ignite and result in
property damage, severe injury, or loss of life.