819682-UIM-A-0212
Johnson Controls Unitary Products
5
DUCT WORK TRANSITION
Duct work that is not designed to match the supply air opening can
cause turbulence inside the plenum box. This turbulence can change
the air flow patterns across the heat kit limit switch. If the factory sug-
gested transition can not be fabricated, it is recommended a block off
plate (approximately 8” in height and running the full width of the ple-
num) be attached to the supply opening Please refer to Figure 9 as a
visual aid. The use of this block off plate will keep better air circulation
across the limit switch.
AIR FILTERS
Air filters and filter racks must be field supplied.
.
SUSPENSION KITS
A suspension kit is available. Models 1BH0601 (unit size 018-060) is
designed specifically for the units contained in this instruction (upflow
application only). For installation of these accessory kits, see the
instructions packed with the kit.
HORIZONTAL SUSPENSION
For suspension of these units in horizontal applications, it is recom-
mended to use angle steel support brackets with threaded rods, sup-
porting the units from the bottom, at the locations shown in Figure 5.
SECTION IV: ELECTRIC HEATER
INSTALLATION
If the air handler requires electric heat, install the electric heat kit
according to the installation instructions included with the kit. After
installing the kit, mark the air handler nameplate to designate the heater
kit that was installed. If no heater is installed, mark the name plate
appropriately to indicate that no heat kit is installed.
The HEAT ENABLE jumper (See Figure 10) must be moved to the
HEAT position to enable operation of the heater.
Use only 4HK heater kits, as listed on Air Handler name plate and in
these instructions. Use data from Tables 10 through 19 for information
on required minimum motor speed tap to be used for heating operation,
maximum over-current protection device required and minimum electri-
cal supply wiring size required – for listed combination of Air Handler
and Heater Kit.
For upflow, downflow and horizontal right hand applications the kits can
be installed without modification.
Field modification is required for horizontal left hand airflow application
only. Follow instructions with heater for modification.
FIGURE 5:
Duck Work Transition
This will not alleviate problems caused by improper installation. When
receiving intermittent fault codes pertaining to the limit switch always
double check your airflow CFM, motor speed and static pressures.
Equipment should never be operated without filters.
SUGGESTED LOCATION
OF BLOCK OFF PLATE
RECOMMENDED
TRANSITION
NOTICE
Units
(Nominal Tons)
Dimension
WW
XX
YY
1-1/2 - 3 Ton
16”
48”
22”
3-1/2 - 5 Ton
24”
53” - 58”
22”
FIGURE 6:
Typical Horizontal Installation
WW
XX
SUSPENSION SUPPORT LOCATIONS FOR HORIZONTAL APPLICATIONS
2
1-1/2
MIN. 1-1/2” x 1-1/2” Angle
Recommended length
26” minimum
with 2” clearance on
both sides of Air Handler
MIN. 3/8”
THREADED ROD
YY
FIGURE 7:
Control Board
HEAT ENABLE
JUMPER
HUM OUT
RELAY OUTPUT
EAC RELAY
OUTPUT
LOW FAN
RELAY OUTPUT
SPARE
JUMPER
HUM STAT JUMPER
MODE JUMPER
FUSE
