Electrical Controls And Wiring; Boiler Room Air Supply And Ventilation; Water Piping At Boiler - Slant/Fin SE-70 Installation And Operating Instructions Manual

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Table A.
Gas Flow In Piping --
Length
of Pipe
Iron Pipe Size (IPS)—inches
in Feet
1/2 3/4
10 132 278
20 92 190
30 73 152
40 63 130
50 56 115
60 50 105
70 46 96
80 43 90
90 40 84
100 38 79
At pressure drop of 0.3 in. water, specific gravity = 0.60.
D. All gas piping used should be inspected thoroughly for
cleanliness before makeup. A sediment trap must be pro-
vided, as illustrated on page 2.
E. The minimum and maximum gas supply pressure (at the
inlet of gas valve) are shown on the boiler rating plate for
the type of gas used. Gas supply pressure should never be
less than minimum or more than maximum pressure when
the boiler or any other appliance is turned on or off.

ELECTRICAL CONTROLS AND WIRING

A. The electrical power to the boiler must be on a separately
fused and live circuit.
B. If an external electrical source is utilized, the boiler, when
installed, must be electrically grounded in accordance with
the requirements of the authority having jurisdiction or, in
absence of such requirements, with the National Electrical
Code, ANSI/NFPA No. 70-latest edition.
C. Basic control wiring diagrams are given on page 13. Other
control systems may be factory supplied, see User's
Information Manual and Instructions packed with control
system supplied.
D. After placing the boiler in operation, the safety shutoff
device must be tested. See page 12 safety check.

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 5.3, 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 following 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"
cu. ft. per hr.
1 1-1/4 1-1/2
520 1050 1600
350 730 1100
285 590 890
245 500 760
215 440 670
195 400 610
180 370 560
170 350 530
160 320 490
150 305 460
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 win-
dows 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
I. CIRCULATING SYSTEMS
A. Packaged water boilers are equipped with a water circu-
lating pump, mounted to return the water into the boiler.
For some installations, the pump should be on the sup-
ply main. See figure 6.
II. 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 6. 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 6.
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.
C. On a hot water boiler installed above radiation level, the
boiler must be provided with a low water cutoff device at
the time of installation by the installer.
Figure 6. Piping arrangement
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