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BOILER ROOM AIR SUPPLY AND VENTILATION
An ample supply of air is required to obtain combustion and
ventilation. ALL AIR COMES FROM OUTSIDE, directly
through wall openings to the boiler or through unsealed open-
ings around windows, doors, etc. in the whole building.
When buildings are insulated, caulked and weather stripped,
now or later on, direct openings to outside may be required
and should be provided. If the boiler is not near an outside
wall, air may be ducted to it from outside wall openings.
Provisions for combustion and ventilation air must be made in
accordance with section, "Air for Combustion and Ventilation",
of the National Fuel Gas Code, ANSI Z223.1- latest edition,
or applicable provisions of the local building codes. The fol-
lowing recommendation applies to buildings of energy-saving
construction, fully caulked and weather stripped:
Provide one GRILLED opening near the floor and one near
the ceiling on an outside wall near the boiler (or duct from
such openings to the boiler), EACH opening to be a minimum
of one square inch per 2000 Btuh input to ALL APPLIANCES
in the area. For a total appliance input of 200,000 Btuh, each
opening will be 100 square inches. A grilled opening 10"X10"
has 100 square inches of area. If fly screen must be used
over openings, double the area and inspect and clean the
screen frequently. Openings must never be reduced or
closed. If doors or windows are used for air supply, they must
be locked open. Protect against closure of openings by snow
and debris. Inspect frequently. No mechanical draft exhaust
or supply fans are to be used in or near the boiler area.
The flow of combustion and ventilating air to the boiler must
not be obstructed.
WATER PIPING
A. Packaged water boilers are equipped with a water cir-
culating pump, mounted to return the water into the
boiler. For some installations, the pump should be on
the supply main. See figure 10.
B. For zoning and piping arrangement with indirect water
heater, see figure 11 and 12.
AIR CONTROL SYSTEM
A. DIAPHRAGM-TYPE COMPRESSION TANKS are used
to control system pressure in an AIR ELIMINATING
SYSTEM: an automatic air vent is used to REMOVE air
from the system water. See figure 8. If system pressure
needs further control, add an additional tank or install a
larger capacity tank. Locate the tank near the boiler, as
illustrated.An automatic air vent should be installed in
the top of the boiler or air purger. See figure 10.
B. PUMP LOCATION — Locating low-head pump(s) on
return to boiler is acceptable for smaller boiler sizes in
residences of one or two stories. The alternate pump
location shown in illustration is required in large, multi-
story building installations, especially when high-head
pumps are used. The compression tank must be at the
boiler or between boiler and supply main pump(s).
IMPORTANT: Hot water heating systems containing
high water volume, such as would occur with cast-iron
radiation, require special care with air elimination.
The circulator pump should be located on the boiler
supply pipe and the expansion tank and air scoop
should be located near the pump suction.
Figure 10. Piping arrangement
OPERATING INSTRUCTIONS
FILLING AND VENTING WATER SYSTEMS
A. Fill the system with water. Vent or purge off air.
B. Fire the boiler as soon as possible (see following warning
and instructions) and bring water temperature to at least
180 degrees, while circulating water in the system.
C. Vent air and add water as needed to achieve operating
pressure on boiler gauge. Pressure must be between
approximately 12 psi (cold water) and 25 psi (at water
temperature setting of high limit control), for boilers
equipped with 30 psi relief valves. Boilers rated for a high-
er pressure and equipped with a matching relief valve may
operate at a higher pressure, but no higher than 5 psi
below the relief valve opening pressure.
D. Check for and repair any leaks before placing system in ser-
vice.
Before firing boiler, make these checks:
1. System is full of water. Air is vented or purged.
2. Relief valve is installed in accordance with the ASME
Boiler Pressure Vessel Code, Section IV. Valve opening is
not closed or reduced in size.
3. Venting is installed according to instructions under "VENT
PIPING".
4. All wiring is completed, following applicable wiring dia-
grams.
5. Using soap solution, check for gas leaks in all gas piping
from meter to boiler pilot and manifold. DO NOT use open
flame.
17
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