5834853-YIM-B-0320
Johnson Controls Ducted Systems
17
A disconnect must be utilized for these units. Factory installed
disconnects are available. If installing a disconnect (field
supplied), refer to Figures 1011 through 13 for the
recommended mounting location.
NOTE:
Since not all local codes allow the mounting of a
disconnect on the unit, please confirm compliance with
local code before mounting a disconnect on the unit.
Electrical line must be sized properly to carry the load. USE
COPPER CONDUCTORS ONLY. Each unit must be wired with
a separate branch circuit fed directly from the meter panel and
properly fused.
Thermostat Wiring
A two stage thermostat must be used and should be located on
an inside wall approximately 56 inch above the floor where it will
not be subject to drafts, sun exposure or heat from electrical
fixtures or appliances. Follow the manufacturer's instructions
enclosed with thermostat for general installation procedure.
Seven (7) color-coded, insulated wires should be used to
connect the thermostat to the unit. Refer to Table 7 for control
wire sizing and maximum length.
Avoid damage to internal components if drilling holes for
disconnect mounting.
When connecting electrical power and control wiring to
the unit, water-proof connectors must be used so that
water or moisture cannot be drawn into the unit during
normal operation. The above water-proofing conditions
will also apply when installing a field supplied disconnect
switch.
When installing equipment in a facility with a 3 phase
high-leg delta power supply, care must be taken to
ensure that the high-leg conductor is not attached to
either of the two legs of the (single phase, direct drive)
X13 or ECM motors. Failure to do so can result in the
motor acting erratically or not running at all.
Check for the high leg conductor by checking voltage of
each phase to ground.
Example: A or L1 phase to ground, voltage reading is
120V. B or L2 phase to ground, voltage reading is 195 to
208V. C or L3 phase to ground, voltage reading is 120V.
Therefore B or L2 phase is the high Leg. The high
should always be wired to the center or B or L2 tap.
Note:
Check all three phase motors and compressors
for proper rotation after making a change. If it is
necessary to change 3 phase motor rotation, swap A or
L1 and C or L3 only.
Table 7: Control Wire Sizes
Wire Size
Maximum Length
1
1. From the unit to the thermostat and back to the unit.
18 AWG
150 Feet
Summary of Contents for ZZ Series
Page 10: ...5834853 YIM B 0320 10 Johnson Controls Ducted Systems Figure 10 ZZE07 08 Unit Dimension...
Page 11: ...5834853 YIM B 0320 Johnson Controls Ducted Systems 11 Figure 11 ZZ09 12 Unit Dimensions...
Page 12: ...5834853 YIM B 0320 12 Johnson Controls Ducted Systems Figure 12 ZZ14 Unit Dimensions...
