5. Disassemble loose pipe fittings. Clean and cement using same
procedures as used for system piping.
6. Check required dimensions as shown in Fig. 38 or 39.
MULTIVENTING AND VENT TERMINATIONS
When 2 or more 58MTA furnaces are vented near each other, each
furnace must be individually vented. NEVER common vent or
breach vent 58MTA furnaces. When 2 or more 58MTA furnaces
are vented near each other, 2 vent terminations may be installed as
shown in Fig. 43, 44, 45, 46, or 47, but the next vent termination
must be at least 36 in. away from first 2 terminations. It is
important that vent terminations be made as shown to avoid
recirculation of flue gases. Dimension A in Fig. 43, 44, 45, 46, and
47 represents distance between pipes or rain shields, as touching or
2-in. maximum separation.
Step 10—Condensate Drain
UNIT MAY NOT OPERATE
Failure to follow this caution may result in intermittent unit
operation.
Unit must not be installed, operated, and then turned off and
left in an unoccupied structure during cold weather when
temperature drops to 32°F and below unless drain trap and
drain line have adequate freeze protection. See Service and
Maintenance Instructions for winterizing procedure. (See Fig.
42.)
GENERAL
Condensate trap is shipped installed in the blower shelf and factory
connected for UPFLOW applications. Condensate trap must be
RELOCATED for use in DOWNFLOW and HORIZONTAL
applications.
Condensate trap MUST be used for all applications.
Fig. 37—Roof Termination (Preferred)
A87224
18
″
MAXIMUM
COMBUSTION
AIR
COUPLING
ROOF
VENT
BRACKET
VERTICAL SEPARATION
BETWEEN COMBUSTION
AIR AND VENT
8
3
/
4
″
FOR 3
″
KIT
6
3
/
4
″
FOR 2
″
KIT
MAINTAIN 12 IN. MINIMUM
CLEARANCE ABOVE HIGHEST
ANTICIPATED SNOW LEVEL.
MAXIMUM OF 24 IN.
ABOVE ROOF.
Fig. 38—Concentric Vent and Combustion-Air Roof
Termination (Preferred)
A93054
COMBUSTION
AIR
MAINTAIN 12 IN.
(18 IN. FOR CANADA)
MINIMUM CLEARANCE
ABOVE HIGHEST
ANTICIPATED SNOW
LEVEL. MAXIMUM OF
24 IN. ABOVE ROOF.
VENT
Fig. 39—Concentric Vent and Combustion-Air Side
Termination
A93055
MAINTAIN 12 IN.
CLEARANCE
ABOVE HIGHEST
ANTICIPATED SNOW
LEVEL OR GRADE,
WHICHEVER IS
GREATER.
COMBUSTION-AIR
VENT
1″ MAXIMUM
12
″ MINIMUM
OVERHANG OR ROOF
33
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