Sentry S-34 Installation And Operating Instructions Manual page 5

Sentry
. 5. This device must be installed after the appliance draft hood
(between the draft hood outlet and the connector to the out-
door chimney or vent) as close to the draft hood as practica-
ble, and without modification of the draft hood or the
damper. (See figures 1 and 2.)
6. The inlet size of the vent damper must be the same nominal
trade size as the outlet of the draft hood.
7. This device must be located in a venting system or section of
a venting system so that it serves only the single appliance
for which it is installed. (See fig. 5.)
8. Clearances of not less than 152 mm (6 inches) must be
maintained from combustible materials, with provisions for
access for service.
B. NOW, PROCEED AS FOLLOWS:
1.Separate the vent pipe directly on top of the draft hood or
diverter and place damper in position as shown in figures 1 -
5. The vent damper must be installed so that the damper
position indicator is in a visible location after installation. See
figure 4 for position indicator description. The arrow imprint
on the damper should point in direction of vent gas flow
(towards chimney). Re-assemble the vent piping. Be sure
the vent damper is well seated and fastened with 3 sheet
metal screws. Screws should be no longer than 13 mm (
inch). See figure 6.
2. Be sure that undersized vent pipe does not block movement
of damper vane (see figure 4).
3. Boilers that have a vent damper are factory wired with a male
plug.
a) Attach the flexible metallic conduit vent damper harness to
the right hand side of the jacket by passing the free end of
the harness through the 22 mm (
top of the jacket, and using the BX connector at the free
end of the metallic conduit, fasten to jacket.
Figure 1. Vertical Installation of Vent Damper on
Sentry "S" Boilers
Figure 2. Horizontal Installation of Vent Damper
22 mm (
1 /
2
7 / ") diameter hole in the
8
FIGURE 3
7 / ") DIA.K.O.
8
TABLE
Vent 102 mm 127 mm
Size (4") (5")
A 237 mm 262 mm
(9 5 / ") (10 5 / ")
16 16
FIGURE 4
NOTE: DAMPER POSITION INDICATOR
DAMPER VANE FULLY OPEN
UNDERSIZED VENT PIPE MAY BLOCK
THE MOVEMENT OF THE DAMPER
VANE. IF THIS OCCURS CUT OFF 1/2 OF
THE MALE (CRIMPED) END OF VENT
PIPE AND REFIT.
b) Connect "FEMALE PLUG" (free end of vent damper har-
ness) into "MALE PLUG" (see correct wiring diagram for
intermittent pilots).
c) The other end of the flexible metal conduit has a small
molex plug and a 90 degree metal conduit connector.
Route the molex receptacle through the conduit bracket
on the vent damper. Place the harness receptacle into the
damper plug. Securely fasten the harness conduit con-
nector to the conduit bracket by carefully pushing it into
the hole in the bracket.
4. Restore electrical power and turn on gas supply.
C. 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 POSITION WHEN
BOILER MAIN BURNERS ARE OPERATING.
2. Perform installation checks as required by ANSI specification
Z21.66 or CSA B149.1 latest edition for natural gas and
propane.
3. Replace the front cover of the boiler.
4. Check the troubleshooting section if problems arise with the
installation.
152 mm 178 mm
(6") (7")
287 mm 313 mm
(11 5 / ") (12 5 / ")
16 16
MAY BE VIEWED THROUGH HOLE
IN THE CASTING ON THE SIDE
OPPOSITE THE OPERATOR
5