Warning – Schwank P40U Fenwal User Manual
Page 17
17
P40U-F / P40U-IF I&O Manual
IM101220
RD: MAY 2014
RL: 5A
WARNING
9. FLUE
VENTING
Inadequate venting of a heater may result in asphyxiation, carbon monoxide
poisoning, injury or death. This heater may use a vent connection or indirect
venting system to remove products of combustion from the space. Seal all vent
connections with high temperature sealant. Venting must be in accordance with
all local, state, provincial, and national codes (ANSI Z223.1/NFPA 54 in USA;
B149.1 in Canada) and as indicated below in this manual.
T
HIS
TUBE
HEATER
IS
APPROVED
FOR
VENTING
DIRECTLY
TO
THE
OUTSIDE
AND
UNVENTED
(
INDIRECT
VENTING
)
APPLICATIONS
. T
HE
SYSTEM
MUST
NOT
BE
OPERATED
WITHIN
A
NEGATIVE
AIR
CONDITION
UNLESS
COMBUS-
TION
AIR
IS
DUCTED
FROM
OUTSIDE
DIRECTLY
TO
THE
BURNER
.
I
F
NEGATIVE
PRESSURE
IS
EXPERIENCED
OR
ANTICIPATED
,
OUTSIDE
COMBUSTION
AIR
MUST
BE
DUCTED
TO
THE
BLOWER
INLET
,
AND
THE
’
ATMOSPHERE
’
PORT
(
BARB
)
ON
THE
BLOCKED
FLUE
SWITCH
MUST
BE
CON-
NECTED
DIRECTLY
TO
OUTSIDE
AIR
USING
1/4”
PLASTIC
HOSE
FROM
THE
SWITCH
TO
OUTSIDE
OF
BUILDING
(
PLASTIC
HOSE
IS
FIELD
SUPPLIED
).
UNVENTED (INDIRECT MECHANICAL VENTING SYSTEM)
Indirect venting must not be used if the building experiences a negative air condition. A mini-
mum 10 inch (25 cm) length of single walled vent pipe is to be installed on the swaged end of
the last tube before any Tee, Elbow or Termination Cap is fitted.
USA: Natural or mechanical means shall be provided to supply and exhaust at least 4ft
3
/
min/1000Btuh (0.38m
3
/min/kW) input of installed heaters. Some local codes may require an
electrical interlock to a dedicated exhaust fan. Exhaust must be located as high as practicable
in the structure above the level of the heater(s). Consult your local code and ANSI Z223.1 lat-
est edition for all venting requirements and practices.
Canada: It is required that the heater(s) be electrically interlocked to dedicated exhaust fan(s)
by means of an Air Proving Switch. Exhaust fan(s) must be sized to create 300 cfm (8.5 cu m/
min) exhaust for every 100,000 Btuh (30 kW) or any fraction thereof of total input of installed
equipment. Exhaust must be located as high as practicable in the structure above the level of
the heater(s). Sufficient supply air must be provided. Consult the latest edition of CSA.B149.1
Section 8 for venting system and air supply requirements.
VENTED DIRECTLY TO THE OUTSIDE
It is the sole responsibility of the installer to adhere to all current local codes and/or ANSI
Z223.1 / CSA.B149.1 latest editions for all venting requirements, and practices.
It is a normal condition that during heat-up and cool-down a tube heater will expand and con-
tract. Allowances for heater expansion must be made in the venting and combustion air ducting.
Improper installation can result in property damage, injury or death.
All vent pipe and adapters are supplied locally by others
All venting must be minimum 26 gauge single wall vent pipe of 4” (10 cm) diameter except
that portion of vent passing through a combustible wall or roof can be 4” type “B” vent as per
CSA International’s interim requirement.
As an Option, two heaters may be vented through an approved common 4" x 4" x 6" Vent
Tee (10 x 10 x 15 cm), supplied by the manufacturer. Vent pipe from each heater does not