Installation - Carrier 912SD Installation, Start-Up, Operating And Service And Maintenance Instructions

912SD: Installation, Start-up, Operating and Service and Maintenance Instructions
condensate and compatible with mineral and vegetable oils, such as
Carolan oil.
Allow at least 1/4-in. per foot (20 mm per meter) of slope down and
away from the furnace in horizontal sections of drain line.
NOTE: Trap grommet is required only for direct-vent
applications.
Fig. 18 – Horizontal Drain Trap Grommet

INSTALLATION

!
This furnace is certified to leak 2% or less of nominal air conditioning
CFM delivered when pressurized to 1-in. water column with all present
air inlets, including bottom closure in upflow and horizontal
applications, air outlets, and plumbing and electrical ports sealed.
Upflow Installation
N Coil Installation
When a 17-1/2-in. wide upflow N coil is used with a 42060E17 furnace,
the N coil must either be raised using a transition piece at least 3-in. (76
mm) high or if a transition piece is not used, the refrigerant lines of the N
coil must point to the front of the furnace casing. Factory accessory
4-3/4-in. transitions are available. Refer to the Product Data for the
current accessory transition part number.
CAUTION
!
FURNACE RELIABILITY HAZARD
Failure to follow this caution may result in nuisance limit switch
cycling and unit component damage.
When a 17-1/2-in. wide upflow N coil is used with a 42060E17 furnace,
the N coil must either be raised using a transition piece at least 3-in. (76
mm) high or if a transition piece is not used, the refrigerant lines must
point to the front of the furnace casing.
NOTE: The furnace must be pitched as shown in
condensate drainage.
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
Remove knockout.
Install grommet before
relocating condensate
trap.
NOTICE
Fig. 19
LEVEL 0-IN. (0 MM) TO
1/2-IN. (13 MM) MAX
UPFLOW OR
DOWNFLOW
Supply Air Connections
For a furnace not equipped with a cooling coil, the outlet duct shall be
provided with a removable access panel. This opening shall be
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accessible when the furnace is installed and shall be of such a size that
the heat exchanger can be viewed for possible openings using light
assistance or a probe can be inserted for sampling the air stream. The
cover attachment shall prevent leaks.
Connect supply-air duct to flanges on furnace supply-air outlet. Bend
flange upward to 90°° with wide duct pliers. See
duct must be connected to ONLY the furnace supply-outlet-air duct
flanges or air conditioning coil casing (when used). DO NOT cut main
furnace casing side to attach supply air duct, humidifier, or other
accessories. All supply-side accessories MUST be connected to duct
external to furnace main casing.
Return Air Connections
FIRE HAZARD
A failure to follow this warning could cause personal injury, death
and/or property damage.
Never connect return-air ducts to the back of the furnace. Follow
instructions below.
The return-air duct can only be connected to bottom of the furnace. sides
(left or right), or a combination of bottom and side(s) of main furnace
casing. Bypass humidifier may be attached into unused return air
side of the furnace casing. See
Bottom Return Air Inlet
These furnaces are shipped with bottom closure panel installed in bottom
return-air opening. Remove and discard this panel when bottom return
air is used. To remove bottom closure panel, see
for proper
PERFORATED
DISCHARGE DUCT
FLANGE
15
MIN 1/4-IN. (6 MM) TO
1/2-IN. (13 MM) MAX
Fig. 19 – Furnace Pitch Requirements
WARNING
!
Fig. 22, Fig. 23, and
UPFLOW DOWNFLOW
90°
YES
YES
120° 120°
MIN MIN
NO
Fig. 20 – Duct Flanges
HORIZONTAL
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Fig. 20. The supply-air
Fig. 24.
Fig. 24.
HORIZONTAL
90°
YES
YES
YES
YES
120°
MIN
NO NO
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