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18
VENTING AND AIR INTAKE SYSTEM REGULAR
INSPECTION
A. Inspect the system regularly for condensation, corrosion,
sagging and/or physical damage. A qualified professional
should service the boiler annually and include such an
inspection at that time. The homeowner should look over
the system monthly for damage, water stains, any signs of
rust, other corrosions or separation of the vent and air
intake piping (if direct-vent).
B. Should an inspection turn up signs of condensation,
corrosion, sagging or damage, the boiler should be shut
down immediately and the condition should be corrected
by a qualified professional.
CONDENSATE REMOVAL SYSTEM
The Bobcat B-120A and B-200A boilers are equipped with a
built-in condensation drain and trap. The trap must be filled
with water. DO NOT operate the boiler without filling the trap
with water to prevent flue gas discharge into space. Periodic
inspection should be made of this assembly for deterioration
of the tubing and to insure that the trap is not plugged. If it is
plugged or appears to have excessive sediment in it, it
should be removed from the drain assembly, straightened out
to clear the obstruction, reformed, filled with water and
reinstalled as before.
A 3/4" PVC tee, located on the right side of the boiler jacket,
is provided to run the condensate liquid from the boiler.
Connect the plastic tubing that will be run to the drain to the
bottom take-off of the tee. Leave the top take-off of the tee
open, to act as a vacuum breaker. If the building drain is
above the bottom portion of the tee, a condensate removal
pump will be required. This pump must have an overflow
switch, and be compatible with the acidic condensate liquid,
as must all fittings and the tubing used in this condensate
removal system. (See Figure 15).
No part of the condensate removal system can be exposed
to freezing temperatures, or any other conditions that could
cause blockage. DO NOT run drain tubing to the outside of
the building. In addition, certain jurisdictions or drain pipe
materials may require a neutralization unit to be installed in
the condensate removal system. Any piping other than
plastic types will be subject to corrosion or deterioration from
the acidic condensate, which may have a pH level as low as
3.0. A condensate filter containing lime, marble, or phosphate
Figure 15. Condensate disposal system
Bobcat Models B-120A and B-200A
chips can neutralize the condensate to a pH level above 6.5,
which is safe for all drain piping materials. (See Figure 15).
The neutralizing filter medium will require periodic changing,
to ensure it's affectiveness. Replacing the medium on an
annual basis is recommended, or refer to the manufacturer's
instructions for systems that are available for neutralizing
condensate.
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 run directly from
the meter for natural gas or from the fuel tank for L.P .
propane gas. A manual gas supply shut-off valve is
provided on the boiler's gas supply pipe. (See Figure 2,
on page 3). Local codes may specify a manual main gas
supply shut-off valve to be1524mm ( 5') above the floor,
and a disconnection union at the gas piping entrance to
the boiler. In this case, unless the boiler is wall mounted at
the right height, the gas supply shut-off valve must be
relocated to the specified location. If the gas supply pipe
must be upsized for flow considerations, then the same
size main gas supply shut-off valve must be used.
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 below to select proper pipe size.
EXAMPLE: Boiler model B-120 is to be installed. Distance
from gas meter to the boilers is 9.1m (30 ft.) Heating value of
natural gas is 10557 W/m
3
pipe size.
Gas flow =
35 170 W/h
10 560 W/m
(120 000 BTU/h)
(1 020 BTU/cu.ft. )
(1020 Btu/cu. Ft.) Select proper
= 3.33 m
3
/h
3
= (118 cu.ft./h)
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