253462-BTG-N-1010
Johnson Controls Unitary Products
13
COOLING MODELS WITH/WITHOUT ELECTRIC HEAT WIRING
Combustible Floor Base Accessory
Floor Base
Models
Used with
Dimensions
A
B
C
D
1FB1817
MA08B, MA12B
19.9
18.0
14.9
16.9
1FB1821
MA16C
23.4
21.5
18.4
20.4
1FB1824
MA14D, MA20D
26.9
25.0
21.9
23.9
Air flow data shown above 0.50” W.C. external static pressure is for REFERENCE ONLY. Maximum allowable external static when electric heat
is used is limited to 0.50” W.C. Maximum allowable external static pressure may also be limited by minimum CFM requirements for proper Heat
Pump operation.
DOWNFLOW
AIR HANDLER
WARM AIR PLENUM
WITH 1” FLANGES
FIBERGLASS
INSULATION
FIBERGLASS TAPE
UNDER FLANGE
COMBUSTIBLE FLOOR
BASE ACCESSORY
A
B
B
A
AIR HANDLER
DEPTH
FRONT
FLOOR
1
10-47/64
PLENUM
12-1/2
FLOOR OPENING
APPROX. 1/2”
CLEARANCE
ALL AROUND
FLOOR
A
AIR HANDLER
WIDTH
COMBUSTIBLE
FLOOR BASE
1
1
APPROX. 1/2”
CLEARANCE
ALL AROUND
C
FLOOR OPENING
B
PLENUM
All dimensions are in inches. The
y
are subject to change without notice.
Certified dimensions will be provided upon request.
NOTICE
Air Handler Control Wiring
Typical A/C - Cooling only Applications
THERMOSTAT
AIR HANDLER
BOARD
1 - STAGE
AIR CONDITIONING
R
R
G
Y
W1
W2
C
G
W1
W2
Y
C
Y / Y2
Y1
O
HUM
X / L
COM
HUMIDISTAT*
THERMOSTAT
AIR HANDLER
BOARD
1 - STAGE
AIR CONDITIONING
R
R
G
Y
W1
W2
C
G
W1
W2
Y
C
Y / Y2
Y1
O
HUM
X / L
COM
HUMIDISTAT*
Air Handler Control Wiring
Typical A/C with Electric Heat Applications
