Filter
Top Products
Bobcat Models B-120A and B-200A
18
VENTING AND AIR INTAKE SYSTEM REGULAR INSPECTION
A. Inspect the system regularly for condensation, corrosion,
s
agging 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 immediate-
ly and the condition should be corrected by a qualified
professional.
CONDENSATE REMOVAL SYSTEM
The Bobcat B-120 and B-200 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 exces-
sive 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 con-
densate liquid, as must all fittings and the tubing used in this con-
densate 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 sys-
tem. Any piping other than plastic types will be subject to corrosion
or deter
ioration from the acidic condensate
, which may have a pH
le
vel as low as 3.0. A condensate filter containing lime, marble, or
phosphate chips can neutralize the condensate to a pH level
a
bove 6.5, which is safe for all drain piping materials. (See Figure
1
5). 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.
COMMONWEALTH OF MASSACHUSETTS SPECIAL
REQUIREMENT
When the Bobcat B-120A and B-200A are installed and used in
the Commonwealth of Massachusetts, a neutralization unit MUST
be installed in the condensate removal system.
GAS PIPING
A. Local installation codes apply. The pipe joint compound used
on threads must be resistant to the action of liquefied petrole-
um 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 be 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 30ft. Heating value of natural gas is
1020 Btu/cu. Ft. Select proper pipe size.
Gas flow = 120,000 Btu/hour
= 118 cu. ft. per hour
1020 Btu/cu. ft.
CONDENSATE TRAP,
FILLED WITH
WATER
DRAIN VACUUM
BREAKER, LEAVE
OPEN
PLASTIC
TUBING
NEUTRALIZING
UNIT
(IF REQUIRED)
CONDENSATE
PUMP
(IF REQUIRED)
DRAIN
INSIDE
BUILDING
Figure 15. Condensate disposal system