To ensure the unit does not short circuit, only use louver sections that provide different deflection
angles for air discharge and air intake. Protect the unit from weather such as rain or snow entering
through the condenser air intake.
Pitch all outdoor air ducts away from the unit and toward the outside wall. Connect all ducts to the
unit with canvas section duct connectors or choose another suitable noise and vibration absorbing
device.
Note:
The manufacturer will not accept any liability resulting from incorrect installation of this
equipment. Follow installation instructions carefully.
Electrical wiring
Follow local electrical codes when making electrical connections. Units are completely factory
wired for normal supply voltages (for example, 208-230/460/575V-3Ph-60Hz). Confirm the unit
specifications by checking the nameplate. The factory wiring terminates in two boxes, one in each
section of the unit. The electrical control boxes are behind the outer access panels. Each electrical
compartment has its own control cover.
Provide individual power disconnects for each unit or, in the case of split applications, each section.
Install a secure ground to both evaporator and condenser. If canvas flexible joints are used on the
ductwork, install a ground wire to the ductwork as well.
The unit requires the installer to provide a 24V thermostat with appropriate heating and cooling
stages. The condenser section electrical cover is installed with wiring diagrams on the inner access
door, which must be opened to read the diagrams.
WARNING
Disconnect and lock out power when servicing unit. Unit may start automatically if power is not
disconnected. Failure to do so may result in personal injury or death due to electrical shock.
Packaged unit
If the unit is installed as a packaged unit, the thermostat (low voltage) wiring and power wiring are
brought through the evaporator section. Check the unit nameplate for minimum circuit ampacity
and fuse sizing.
Split system
If the unit is a split system application, the condenser section is remote from the evaporator
section. See the wiring diagram in Figure 14 .
WARNING
IMPORTANT: All wiring must comply with applicable local and national electrical codes (NEC). Type and
location of disconnect switches must comply with all applicable codes.
Low voltage wiring
For low voltage thermostat wiring, an 18 gauge wire can be used for up to 100 foot lengths. A
single or multiple stage thermostat (up to four cooling stages) must be used depending on size of
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Model DSH024C–120C Horizontal R-410A Air Conditioning Units C-Generation Smart Equipment Controller
Johnson Controls
