viii - combustion air and vent pipe
While cement is still wet, insert pipe into socket with a ¼ turn
8.
twist. Be sure pipe is fully inserted into fitting socket.
Wipe excess cement from joint. A continuous bead of cement
9.
will be visible around perimeter of a properly made joint.
Handle pipe joint carefully until cement sets.
10.
Support combustion air and vent piping a minimum of every
11.
5’
using pre-formed metal hanging straps. Support combustion
air and vent piping so no weight is resting on the boiler jacket.
Do not rigidly support pipes. Allow movement due to expan-
sion and contraction.
Slope combustion air and vent pipes toward boiler a mini-
12.
mum of ¼” per linear foot with no sags between hangers.
Use appropriate methods to seal openings where vent and
13.
combustion air pipes pass through roof or side wall.
NOTICE
NOTE: It is recommended that all pipes be cut, prepared,
and pre-assembled before permanently cementing any
joint.
After pipes have been cut and pre-assembled, apply cement
7.
primer to pipe fitting socket and end of pipe to insertion mark.
Quickly apply approved cement to end of pipe and fitting
socket (over primer). Apply cement in light, uniform coat on
the inside of socket to prevent buildup of excess cement. Apply
second coat.
NOTICE
NOTE: Primer and cement will discolor jacket. Take pre-
cautions to protect jacket while cementing vent pipe.
iX - Gas supply pipinG
check Gas supply
The gas pipe to your boiler must be the correct size for the length of
run and for the total BTU per hour input of all gas utilization equip-
ment connected to it. See Table 4 for proper size. Be sure your gas
line complies with local codes and gas company requirements.
The boiler and its individual shutoff valve must be disconnected
from the gas supply piping system during any pressure testing of that
system at test pressures in excess of ½ psig (3.5kPa).
The boiler must be isolated from the gas supply piping system by
closing its individual manual shutoff valve during any pressure
taBLE 5: GaS SUPPLY PRESSURE
Natural Gas
4” min. w.c.
10” max. w.c.
LP Gas
10” min. w.c.
14” max. w.c.
Check line pressure while unit is running in high fire mode.
taBLE 4: GaS PiPiNG SiZES
Natural Gas
Pipe Length
Pipe capacity - BtU/Hr. input includes Fittings
½”
¾”
1”
1¼”
20’
92,000
190,000
350,000
625,000
40’
63,000
130,000
245,000
445,000
60’
50,000
105,000
195,000
365,000
LP Gas
Pipe Length
Pipe capacity - BtU/Hr. input includes Fittings
copper tubing (O.D.)
iron Pipe
⅝”
¾”
½”
¾”
20’
131,000
216,000
189,000
393,000
40’
90,000
145,000
129,000
267,000
60’
72,000
121,000
103,000
217,000
The length of pipe or tubing should be measured from the gas meter or
propane second stage regulator.
connecting the Gas piping
Refer to
Figure 9
for the general layout at the boiler, which
shows the basic fittings you will need. As shipped, the gas line
enters the boiler through the right side but, as an option, it can
be routed through either the rear or left side panel.
testing of the gas supply piping system at test pressures equal to or
greater than ½ psig (3.5kPa).
In order for proper operation of the boiler, it is recommended that
the line pressure be within the minimum and maximum values in
Table 5
.
14
Summary of Contents for UTICA BOILERS UB95M-200
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