Installation & Operating Guide

WARNING—DANGER
Once you have begun vent damper installation procedure, DO
NOT restore electric power and gas supply until installation
and inspection have been completed (in order to prevent the
main burners from operating). DO NOT operate the boiler until
the vent damper harness "RECEPTACLE B" is plugged into
"MALE PLUG" (as described in the installation instructions),
and the vent damper installation and checkout procedures
have been completed. Failure to observe this warning may
create a hazardous condition that could cause an explosion or
carbon monoxide poisoning.
B. 1. This device must be installed after the boiler draft hood
(between the draft hood outlet and the connector to the
outdoor chimney or vent) as close to the draft hood as
practicable, and without modification of the draft hood or
the vent damper. (See figure 1 and 2.)
2. The inlet size of the vent damper must be the same
nominal trade size as the outlet of the draft hood.
3. This device must be located in a venting system or sec-
tion of a venting system so that it serves only the single
appliance for which it is installed. (See figure 3.)
4. Clearances of not less than 6 inches (152MM) must be
maintained from combustible materials, with provisions
for service access.
C. NOW, PROCEED AS FOLLOWS:
Remove the cover from the aquastat control. Note the
Molex connector (MALE PLUG) inside the control box (see
figure 5). Remove knockout in the control housing marked
for vent damper, pass “Receptacle B” of vent damper har-
ness through the knockout and attach the flexible metallic
connector to the control housing with the nut. Join the two
halves of the Molex connector (MALE PLUG AND RECEP-
TACLE B). Replace the control cover. Attach the other side
of vent damper harness to vent damper operator (if not
attached) and connect Molex connector to operator recep-
tacle. (See figure 1.)
D. AFTER INSTALLATION:
1. Operate system through two complete cycles to check for
opening and closing in proper sequence, and proper
burner operation. DAMPER MUST BE IN OPEN POSI-
TION WHEN BOILER MAIN BURNERS ARE
OPERATING.
2. Perform installation checks as required by ANSI specifi-
c
ation Z21.66. (See Vent Damper Instructions.)
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. Check the troubleshooting section if problems arise with
the installation.
E. THERMOSTAT HEAT ANTICIPATOR ADJUSTMENTS
If the 24V room thermostat that controls this boiler has an
adjustable heat anticipator and has previously been adjust-
ed without a vent damper, then see publication VD-40 for
correct electrical requirement adder for the vent damper
used. If room thermostat has not been adjusted, connect
entire system to thermostat and run the system while mea-
suring the current drawn through the thermostat wires. Set
the heat anticipator at the value of current measured. For
more information, see Slant/Fin vent damper installation
manual, pub. VD-40, and the manufacturer's vent damper
booklet shipped with the vent damper.
GAS PIPING
A. Local installation codes apply. The pipe joint compound
used on threads must be resistant to the action of liquefied
petroleum gases.
B. The gas supply line to the boiler should be run directly
from the meter for natural gas or from the fuel tank for L.P.
propane gas. See page 2 for location of union and manual
main shutoff valve that may be specified locally.
Selecting pipe size for natural gas:
1. Measure or estimate the length of piping from the meter
to the installation site.
2. Consult gas supplier for heating value of gas (BTU/cu. ft.).
3. Divide boiler rated input by heating value to find gas
flow in piping (cu. ft. per hour).
4. Use table A to select proper pipe size.
Example: Boiler model SE-175 is to be installed. Distance from
gas meter to the boiler is 20 ft. Heating value of natural gas is
1020 BTU/cu. ft. Select proper pipe size.
Gas flow = 175,000 BTU/hour
= 171.5 cu. ft. per hour
1020 BTU/cu.ft.
At 20 ft. length of pipe, match required capacity from Table
A (choose higher capacity, in this case is 190 cu. ft. per
hour). Required pipe size is 3/4".
Improper gas pipe sizing will result in pilot flame outages,
insufficient heat and other installation difficulties. For more
information and also if other appliances are to be attached
to the piping system, see Appendix C of National Fuel Gas
Code ANSI Z223.1-latest edition.
C. The boiler and its gas connection must be leak tested
before placing the boiler in operation. Use liquid soap solu-
tion for all gas leak testing. DO NOT use open flame.
This boiler and its individual shutoff valve must be discon-
nected from the gas supply piping system during any pres-
sure testing of that system at test pressures in excess of
1/2 PSIG. This boiler must be isolated from the gas supply
piping system by closing its individual manual shutoff valve
during any pressure testing of the gas supply piping sys-
tem at test pressures equal to or less than 1/2 PSIG. This
boiler must be isolated from the gas supply piping 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.
Figure 5. Connecting “RECEPTACLE B” to “MALE PLUG” inside
L8148E aquastat box
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Sentinel