Ductwork Acoustical Treatment; Supply-Air Connections; Return-Air Connections - Carrier 58RAV 170 Series Installation, Start-Up, And Operating Instructions Manual

RETURN
AIR
INTERIOR
HEATED
SPACE
SUPPLY AIR
* Minimum opening size is 100 sq in. with
minimum dimensions of 3 in.
†
Minimum of 3 in. when type B-1 vent is used.
Fig. 3—Confined Space: Air for Combustion and
Ventilation from an Unconfined Indoor Space
AIR FROM INDOOR
58RAV
UNCONFINED SPACE
FURNACE
Free Area
INPUT
of Opening
(BTUH)
(Sq In.)
46,000 100
69,000 100
92,000 100
115,000 115
135,000 135
Step 2—Ductwork acoustical treatment
Metal duct systems that do not have a 90 degree elbow and 10 ft
of main duct to the first branch take-off may require internal
acoustical lining. As an alternative, fibrous ductwork may be used
if constructed and installed in accordance with the latest edition of
SMACNA construction standard on fibrous glass ducts. Both
acoustical lining and fibrous ductwork shall comply with NFPA
90B as tested by UL Standard 181 for Class 1 Rigid air ducts.
Step 3—Supply Air Connections
DOWNFLOW FURNACES
Connect supply-air duct to supply-air opening (outlet) on furnace.
(See Fig. 1.) The supply-air duct attachment must ONLY be
connected to furnace supply/outlet or air conditioning coil casing
(when used), when installed on non-combustible material. When
installed on combustible material, supply-air duct attachment must
ONLY be connected to an accessory subbase or factory approved
VENT THROUGH ROOF
(CATEGORY I)
12" MAX
1 SQ IN.
PER 1000
BTUH * IN DOOR
OR WALL
UNCONFINED
SPACE
6" MIN
†
(FRONT)
1 SQ IN.
PER 1000
BTUH * IN DOOR
OR WALL
12" MAX
→Table 2—Minimum Free Area Of Combustion Air Opening
OUTDOOR AIR THROUGH
VERTICAL DUCTS
Free Area of
Opening and Duct
(Sq In.)
11.50
17.25
23.00
28.75
33.75
OUTDOORS
12" MAX
1 SQ IN.
PER 2000
BTUH *
DUCTS
TO
OUTSIDE
1 SQ IN.
PER 2000
BTUH *
12" MAX
SUPPLY AIR
* Minimum dimensions of 3 in.
NOTE: Use any of the following
combinations of openings:
A & B
A93387
Fig. 4—Confined Space: Air for Combustion and
Ventilation from Outdoors
OUTDOOR AIR THROUGH
HORIZONTAL DUCTS
Round Free Area of
Pipe Opening and Duct
(In. Dia) (Sq In.)
4 23.0
5 34.5
6 46.0
7 57.5
7 67.5
air conditioning coil casing. DO NOT cut main furnace casing to
attach supply side air duct, humidifier, or other accessories. All
accessories MUST be connected external to furnace main casing.
HORIZONTAL FURNACES
Connect supply-air duct to supply-air (outlet) opening on furnace.
(See Fig. 1.) The supply-air duct attachment must ONLY be
connected to furnace supply/outlet or air conditioning coil casing
(when used). DO NOT cut main furnace casing to attach supply
side air duct, humidifier, or other accessories. All accessories
MUST be connected external to furnace main casing.
Step 4—Return Air Connections
DOWNFLOW AND HORIZONTAL FURNACES
The return-air duct must be connected to return-air opening (inlet)
provided as shown in Fig. 1. DO NOT cut into casing sides or back
to attach any portion of return-air duct. Bypass humidifier connec-
tions should be made at ductwork or coil casing sides exterior to
furnace.
6
DUCTS TO
D
RETURN
A
VENT
AIR
THROUGH
ROOF
(CATEGORY I)
E
B
C
12" MAX
DUCT
TO
OUTDOORS
C & D D & E F & G
OUTDOOR AIR THROUGH
SINGLE DUCT
Round Free Area of
Pipe Opening and Duct
(In. Dia) (Sq In.)
6 15.33
7 23.00
8 30.67
9 38.33
10 45.00
1 SQ IN.
PER 4000
BTUH
*
12"
MAX
F
1 SQ IN.
PER 4000
BTUH
*
OUTDOORS
1 SQ IN.
PER 4000
BTUH
*
G
12"
MAX
1 SQ IN.
PER 4000
BTUH
A93388
Round
Pipe
(In. Dia)
5
6
7
7
8