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Bobcat Models B-120A and B-200A
At 9.1m (30 ft.) length of pipe, match required
capacity from table on this page (choose higher
capacity, in this case is 4.3m
Required pipe size is 3/4".
Improper gas pipe sizing will result in 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
solution for all gas leak testing. DO NOT use open flame.
This boiler and it's individual shutoff valve must be
disconnected from the gas supply piping system during
pressure testing of that system at test pressures in excess
of 3.5 kPa (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 3.5 kPa (1/2 PSIG).
D. All gas piping used should be inspected thoroughly for
cleanliness before makeup. A sediment trap is integrally
provided, as illustrated on page 3.
E. The minimum and maximum gas supply pressure (at the
inlet of gas valve) is 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.
Length
Pressure drop = 8mm (0.3") water column, 0.60 specific
of Pipe
Iron Pipe Size (Ips)—inches
1/2"
3/4"
3
3
m
ft
m
/hr cu.ft./hr. m
/hr cu.ft./hr. m
3.0
10
3.7 132
7.9 278
6.1
20
2.6
92
5.4 190
9.1
30
2.1
73
4.3 152
12.2
40
1.8
63
3.7 130
15.2
50
1.6
56
3.3 115
18.3
60
1.4
50
3.0 105
21.3
70
1.3
46
2.7
24.3
80
1.2
43
2.5
27.4
90
1.1
40
2.4
30.5 100
1.1
38
2.2
At pressure drop of 8mm (0.3") water column, 0.60 specific gravity gas.
DANGER: Before wiring always turn off electric power sup-
ply. Otherwise, shock or death can result.
ELECTRICAL WIRING
All field wiring to the boiler is connected to the 2 sets of
terminal strips, located under the jacket top panel.
(See Figure 2, on page 3)
1. Power Supply
A separately fused circuit is recommended. Use standard
15 Amp. fuse or breaker and 14 gauge conductors in BX
cable or conduit.
3
/hr. [152 cu. ft. per hr]).
Gas Flow In Piping
gravity gas.
1"
1-1/4"
3
3
/hr cu.ft./hr. m
/hr cu.ft./hr. m
14.7 520
29.7 1050
9.9 350
20.7 730
8.1 285
16.7 590
6.9 245
14.2 500
6.1 215
12.5 440
5.5 195
11.3 400
96
5.1 180
10.5 370
90
4.8 170
9.9 350
84
4.5 160
9.1 320
79
4.2 150
8.6 305
Provide disconnect means and overload protection as
required. See boiler wiring diagram (Figure 16a) boiler
control (Figure16b) and ladder diagram (Figure 16c).
Boiler must be electrically grounded in accordance with
the requirements of the authority having jurisdiction, or, in
the absence of such requirements, with the Canadian
Electrical Code, CSA-C22-1 part 1-latest edition.
Proper polarity is critical for the power supply connec -
tions. Reversed polarity will cause system lockout. Proper
grounding is critical for boiler operation, connect the
ground wire to the green ground screw next to the line
voltage terminal strip.
2. Circulator(s)
A set of terminals are provided for the boiler (primary
loop) circulator. Only wire this circulator to these
terminals, additional (secondary loop) circulators for
space heating require the use of relays and a separate
power source.
For multiple zoning, either zone valves or circulators
maybe used.
For zone valve system (See Figure 17a).
For pump zoning system (See Figure 17b and 17c).
DO NOT use boiler transformer to power external
accessories like zone valve and relays, overload and/or
burned out transformer and boiler malfunction can result.
Use separate transformer to power such components.
A second set of terminals are provided for the domestic
hot water tank circulator (if used). The primary loop
circulator is always de-energized when the DHW tank
circulator is energized, for priority.
3. SPACE HEATING THERMOSTAT(S)
1-1/2"
Install thermostat on an inside wall and away from any
3
/hr cu.ft./hr.
heat sources, sunshine and drafts. A set of terminals are
45.3 1600
provided for connection of 24 volt style thermostats,
31.1 1100
relays or zone valve end switches (isolated contacts).
25.2 890
(See wiring diagram Figure 16a).
21.5 760
19.0 670
Thermostat heat anticipator: For a non-zoned system set
17.3 610
thermostat heat anticipator to 0.1 Amps, for zoned system
15.9 560
set to match power requirements of zone valves or relays.
15.0 530
Refer to manufacturer's instructions and specifications.
13.9 490
Also see instructions with thermostat.
13.0 460
4. DOMESTIC HOT WATER TANK THERMOSTAT
A set of terminals are provided for connection of the DHW
tank thermostat (if used). (See wiring diagram Figure 16a).
5. OUTDOOR AIR SENSOR
A set of terminals are provided for connection of an
outdoor air sensor (if this method is used). (See wiring
diagram Figure 16a).
The outdoor air sensor that is supplied with the boiler is a
12k ohm type. Mount on an outside wall, shielded from
direct sunlight or flow of heat or cooling from other sources.
See instructions provided with sensor.
6. LOW WATER CUTOFF
A set of terminals are provided for connection of a LWCO. If
this device is used, remove the factory installed jumper
from these terminals. (See wiring diagram Figure 16a).
19
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