Johnson Controls JMET12BS2N1 User Manual

6139716-UIM-A-0422
8 Johnson Controls Ducted Systems
The standard ECM motor operates when a 24 VAC signal is sent to any
of its five speed taps. If simultaneous 24 VAC inputs are present, the
motor operates at the highest speed tap that is energized. The lowest
speed is one and the highest speed is five.
The air handler comes factory-wired with the electric heat kit connected
to tap five for the heating speed. There are two speed tap wires for cool-
ing or heat pump blower speeds. The YEL/BLK wire is for first stage
compressor speed and the YEL wire is for full compressor speed. The
RED continuous fan speed wire is connected to speed tap one. If the
lowest speed tap (tap one) is needed for first stage compressor speed,
leave the continuous fan speed wire connected to speed tap one and let
the room thermostat provide the signal (through its G output) for first
stage compressor, as the room thermostat provides a fan output during
a heat pump heating or cooling call. In this particular application, cap off
the YEL/BLK wire and do not use it. Move the electric heat kit wire for
the heating speed from tap five to the appropriate speed tap according
to Table 4 and Table 5.
If electric heat requires speed tap five, the highest speed tap available
for cooling or heat pump heating is tap four. Do not splice or combine
multiple signals to a single blower motor tap. Each of the standard ECM
blower motor speed taps have a built-in 60 s off delay.
The circulating blower (green) thermostat input is factory connected to
speed tap one, which is the lowest speed. The circulating blower (yel-
low) thermostat input is used for the second-stage or full blower speed.
See Figure 14 to Figure 22 for wiring details.
Section IX: Unit data
Figure 12: Blower speed connections
GRN
Blower
motor
C
L
G
N
RED/WHT
BLK/WHT
BLU/WHT
RED
To resistor
YEL
BLK
Standard ECM - high efficiency motor
A1772-001
123 45
YEL/BLK
To 230 V on
transformer
To common
on transformer
To resistor
Table 2: Physical and electrical data - cooling only
Models JMET08B JMET12B JMET12C JMET16C JMET18D
Blower - diameter x width (in.) 11 x 8 11 x 8 11 x 10 11 x 10 11 x 11
Motor
HP 1/3 HP 1/2 HP 1/2 HP 3/4 HP 3/4 HP
Nominal RPM 1050 1050 1050 1050 1050
Voltage (V) 208/230 208/230 208/230 208/230 208/230
Full load amps at 230 V (A) 2.6 3.8 3.8 5.4 5.4
Filter
1
Type Disposable or cleanable
Size (in.) 16 x 20 x 1 16 x 20 x 1 20 x 20 x 1 20 x 20 x 1 23 x 20 x 1
Bottom rack 1BR01117 1BR01117 1BR01121 1BR01121 1BR01124
Shipping/operating weight (lb) 55/54 57/56 61/60 63/62 67/66
Table 3: Electrical data - cooling only
Models
Motor FLA
1
Minimum circuit ampacity (A)
MOP
2
JMET08B 2.6 3.3 15
JMET12B/JMET12C 3.8 4.8 15
JMET16C/JMET18D 5.4 6.8 15
1. FLA = Full Load Amps
2. MOP = Maximum Overcurrent Protection device; must be HACR type circuit breaker or time delay fuse. Refer to the latest edition of the National Electric Code or in Canada the
Canadian electrical Code and local codes to determine correct wire sizing.
Table 4: Electrical heat with heat pump: minimum fan speed (XAF)
Heater kit models
1 2
Nominal kW
at 240 V
Air handler models
JMET08B JMET12B JMET12C JMET16C JMET18D
8HK(0,1)6500206 2.4 Medium (3) High (5) High (5) Medium (3) Medium (3)
8HK(0,1)6500506 4.8 Medium (3) High (5) High (5) Medium (3) Medium (3)
8HK(0,1)6500806 7.7 Medium (3) High (5) High (5) Medium (3) Medium (3)
8HK(0,1)6501006
8HK06501025
9.6 Medium (3) High (5) High (5) Medium (3) Medium (3)
8HK(1,2)6501506
8HK06501525
14.4 — High (5) High (5) Medium (3) Medium (3)
Continued on next page

Johnson Controls JMET12BS2N1 Specifications

General

Brand	Johnson Controls
Model	JMET12BS2N1
Category	Air Handlers
Language	English