Sentry S-120 Installation And Operating Instructions Manual - page 6
D. THERMOSTAT HEAT ANTICIPATOR ADJUSTMENTS
If the 24V room thermostat that controls the boiler has an
adjustment heat anticipator, it must be set to the AMP draw of
the boiler. Connect the system to the thermostat and run the
system. Measure the current draw through the thermostat
wires and set anticipator accordingly. See Appendix "B".
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-W/m
3
(BTU/cu. ft.).
3. Divide boiler rated input by heating value to find gas
flow in piping (m
3
/hr) (cu. ft. per hour).
4. Use table below to select proper pipe size.
Example: Boiler model S-150 is to be installed. Distance
from gas meter to the boiler is 6.1m (20 ft). Heating value of
natural gas is 10560 W/m
3
(1020 BTU/cu. ft.) Select proper
pipe size.
At 6.1m (20 ft.) length of pipe, match required capacity
from table below (choose higher capacity, in this case is
5.4 m
3
[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 or if other appliances are to be attached to the
piping system, see Appendix C of National Fuel Gas Code
ANSI Z223.1-latest edition or CSA B149.1 latest edition for
natural gas and propane.
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 must be isolated from the gas supply piping sys-
tem 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 3.5 kPa (1/2 PSIG).
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 Canadian Electric
Code – CSA-C22.1, Part 1 – latest edition.
C. Basic control wiring diagrams are supplied. Other control
systems may be factory supplied, see User's Information
Manual and Instructions packed with control system sup-
plied.
D. After placing the boiler in operation, the safety shutoff device
must be tested. See page 17 safety check.
Gas flow =
= 4.2 m
3
/hr
44 000 W/hr
10 560 W/m
3
(Gas flow =
= 147.06 cu. ft. per hour)
150 000 BTU/hour
1020 BTU/cu. ft.
13mm (1/2”)
19mm (3/4”)
25mm (1”)
32mm (1 1/4”) 38mm (1 1/2”)
m
ft
m
3
/hr cu.ft./hr. m
3
/hr cu.ft./hr. m
3
/hr cu.ft./hr. m
3
/hr cu.ft./hr. m
3
/hr cu.ft./hr.
3.0
10
3.7
132
7.9
278
14.7 520
29.7 1050
45.3 1600
6.1
20
2.6
92
5.4
190
9.9
350
20.7 730
31.1 1100
9.1
30
2.1
73
4.3
152
8.1
285
16.7 590
25.2 890
12.2
40
1.8
63
3.7
130
6.9
245
14.2 500
21.5 760
15.2
50
1.6
56
3.3
115
6.1
215
12.5 440
19.0 670
18.3
60
1.4
50
3.0
105
5.5
195
11.3 400
17.3 610
21.3
70
1.3
46
2.7
96
5.1
180
10.5 370
15.9 560
24.3
80
1.2
43
2.5
90
4.8
170
9.9
350
15.0 530
27.4
90
1.1
40
2.4
84
4.5
160
9.1
320
13.9 490
30.5
100
1.1
38
2.2
79
4.2
150
8.6
305
13.0 460
Length
of Pipe
Gas Flow In Piping
Pressure drop=8mm(0.3") water column, 0.60 specific gravity gas.
Iron Pipe Size (Ips)
inches
At pressure drop of 0.3 in. water, specific gravity = 0.60 gas.
FIGURE 6
CAUTION
TO PREVENT INTERFERENCE WITH DAMPER VANE
MOVEMENT, SCREWS OR POP RIVETS MUST NOT
BE LOCATED IN SHADED AREAS AND MUST NOT
EXCEED 13 MM (
1
/
2
") IN LENGTH.
SECTION
REMOVED
TO SHOW
SHADED
AREA
FIGURE 5
Sentry
6