Energy Tech Laboratories DSH - Manual (Page 12)

JOHNSON CONTROLS
12
FORM 145.32-IOM1 (908)
ELECTRICAL WIRING
Follow local electrical codes when making electrical
connections. Units are completely factory wired for normal
supply voltages (ie.208-230, 460, 575/3phase/60Hz)
Confirm unit specifications by checking unit data plate.
The factory wiring terminates in two boxes, one in each
section of the unit. The electrical control boxes are
located behind outer access panels. Each electrical
compartment has its own control cover.
Provide individual power disconnects for each unit, or
each section in the case of split applications. Install a
secure ground to both evaporator and condenser. If
canvas joiners are used on ductwork, install a ground
wire to the ductwork as well. Unit requires installer to
provide a 24volt thermostat with appropriate heating
and cooling stages as needed. The condenser section
electrical cover is installed with wiring diagrams on the
inner access door, which must be opened to read the
diagrams.
Disconnect and lock out power when
servicing unit. Unit may start automati-
cally if power is not disconnected. Fail-
ure to do so may result in personal injury
or death due to electrical shock.
PACKAGED UNIT
If unit is to be installed as a complete integral unit, the
thermostat (low voltage) wiring is to be brought through
connection “A”, while power wiring will be brought
through connection “C”). Make sure you check the unit
data plate for full specifications as previously mentioned
(i.e. minimum circuit ampacity and fuse size).
SPLIT SYSTEM
If the unit is a split system application (condenser sec-
tion remote from evaporator section), the following wir-
ing instructions are applicable. The thermostat wiring
is brought through connection “A” on the evaporator
section, and is then interconnected via connection “B”
on the condenser section. The power wiring is brought
through “C” on the condenser section. The power feed
to the evaporator is run through “D” on the evaporator
section.
IMPORTANT: All wiring must comply
with applicable local and national codes
(NEC). Type and location of disconnect
switches must comply with all applicable
codes.
For low voltage wiring, 18 gauge wire may be used for
up to 50 feet lengths. Low voltage runs up to 125 feet
require 16-gauge wire.