Mestek SEPARATED COMBUSTION GAS FIRED PROPELLER UNIT HEATER Especificaciones Pagina 14
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Horizontal venting arrangements are designed to be
used with single wall vent pipe. Horizontal venting
arrangements must terminate external to the building
using UL 1738 Listed and approved single wall or double
wall vent. For installations in Canada, use corrosion
resistant and gas-tight, listed vent pipe conforming with
local building codes, or in the absence of local building
codes, with current CSA-B149.1, Installation Codes for
Natural Gas Burning Appliances and Equipment or
CSA-B149.2, Installation Codes for Propane Gas
Burning Appliances and Equipment.
Do not use Type B (double wall)
vent internally within the building on horizontally
vented power vented units! This can result in
death, serious injury or substantial property
damage.
Single wall and double wall venting components which
are UL 1738 Listed and approved for Category III positive
pressure venting systems MUST be used.
A Breidert Type L, Fields Starkap, or equivalent vent cap
must be supplied by the customer for each power vented
unit. The vent pipe diameter MUST be as specified in
Table 1 (“D” Dia. Flue Opening). All unit sizes are factory
equipped with the required flue size collar; attach in
place (if not mounted to outlet); refer to included vent
collar instruction sheet for additional requirements.
Table 5
The vent terminal must be at least 12 in. (305mm) from
the exterior of the wall that it passes through to prevent
degradation of the building material by fl ue gases.
Through the wall vent for these appliances shall NOT
terminate over public walkways, or over an area where
the condensate or vapor could create a nuisance or
hazard or could be detrimental to the operation of
regulators, relief valves, or other equipment.
The vent pipe equivalent length must not exceed 50 ft.
(15.2m). Equivalent length is the total length of straight
sections PLUS 10 ft. (3.05m) for each 90° elbow and
4 ft. (1.22m) for each 45° elbow.
Maintain clearance between the vent pipe and combus-
tible materials according to vent pipe manufacturer’s
instructions
Seal all vent pipe joints and seams to prevent leakage.
Use General Electric RTV-108, Dow-Corning RTV-732
silicone sealant or equivalent sealant with a temperature
rating of 500°F; or 3M #425 aluminum foil tape (or
equivalent). The vent air system must be installed to
prevent collection of condensate. Pitch horizontal pipes
downward 1/4 inch per foot (21mm per meter) toward the
outlet for condensate drainage.
Horizontal portions of the venting systems shall be
supported at maximum intervals of 4 ft. (1.2m) to prevent
sagging (in Canada, support at 3 ft. (1m) maximum
intervals).
Insulate single wall vent pipe exposed to cold air or
running through unheated areas.
Each unit must have an individual vent pipe and vent
terminal! Each unit MUST NOT be connected to other
vent systems or to a chimney.
VENTING (continued)
HORIZONTALLY VENTED UNIT HEATERS
(CATEGORY III)
Vent Systems
Termination Clearance Requirements
Structure/Object
Minimum Clearance
for Termination Locations
USA CANADA
Door, window, or gravity vent
inlet; combustion air inlet for
other appliances
9 in. for 10,000 to
50,000 BTU/Hr
input; 12 in. for
input exceeding
50,000 BTU/Hr.
9 in. (230mm) for
10,000 to 50,000
BTU/Hr input; 12 in.
(305mm) for input
exceeding 50,000
BTU/Hr.
Forced air inlet within 10 ft.
3 ft. above 6 ft. (1.8m)
Adjoining Building or parapet 10 ft. 10 ft. (3.04m)
Adjacent public walkways
7 ft. above
grade
7 ft. (2.1m) above
grade
Electric, gas meters
& regulators
4 ft. horizontal
3 ft. (0.9m)
horizontally from
meter/regulator
asembly. 6 ft. (1.8m),
any direction, from
a gas service
regulator vent outlet
Above grade level* 1 ft. 1 ft. (0.3m)
*Minimum above maximum snow depth, or per local code, whichever is
greater.
- TABLE OF CONTENTS 2
- DESCRIPTION 2
- GENERAL SAFETY INFORMATION 3
- Rear View 4
- Side View 4
- Front View 4
- INSTALLATION 5
- INSTALLATION (continued) 6
- GAS PIPING 8
- PIPE INSTALLATION 9
- ELECTRICAL CONNECTIONS 10
- VENTING (continued) 14
- (CATEGORY III) 14
- CAT-2765C 17
- OPERATION 19
- OPERATION (continued) 20
- GAS INPUT RATE 20
- SYMPTOMS 22
- MAINTENANCE 26
- LIMITED WARRANTY 27
- IDENTIFICATION OF PARTS 28
- PROPELLER UNIT HEATERS 28
- UNIT NUMBER DESCRIPTION 31
- GAS EQUIPMENT 32
- START-UP 32
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