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7 300614000
CONNECTING ELECTRICAL POWER CIRCUIT TO COOLING Unit
(see Figures 5 and 9)
IMPORTANT: Before 208/230VAC single-phase 60Hz electrical power circuit is connected to the cooling
unit, service power voltage entering the building must be identified. Service power voltage entering the
building will either be 208 or 230VAC and may be posted on the main service box. If not, the installer
must contact the local electrical power company for information. If these two voltage identification
attempts should fail, a voltage reading Must be performed. If service power voltage is below 218VAC,
the red electrical wire connected to the 240VAC terminal on LINE (primary) side of the 240/24VAC power
transformer inside the cooling unit switches electrical control box (see Figure 3 and 9) must be
disconnected from the 240VAC terminal and be connected to the 208VAC terminal. If voltage is above
218VAC, power transformer red electrical wire will remain connected to the 240VAC terminal. If installer
is not sure of the service power voltage entering the building, leave red electrical wire connected to the
240VAC terminal on the power transformer. If service power voltage is below 218VAC, proceed as
follows:
1. Remove four screws securing electrical control box cover, then remove cover for access to the
240/24VAC power transformer.
2. Remove red electrical wire from the 240VAC terminal on LINE (primary) side of power transformer
and connect it to the 208VAC terminal.
RESET BUTTON
C
208V
240V
FIGURE 3. 240/24VAC POWER TRANSFORMER
WARNING: Make sure 40-amp minimum-rated disconnect switch (not provided) is in ‘‘OFF’’
position.
1. Remove cover from electrical handy box on back of Cooling Unit.
WARNING: The Cooling Unit must be electrically grounded to avoid possible fatal electrical
shock or serious injury to the operator. A green ground wire is provided inside electrical
box to connect power circuit ground wire which electrically grounds the Cooling Unit.
Connect 208/230VAC Single-Phase 60Hz power circuit from 40-amp minimum rated disconnect switch (not
provided) fused at 40-amps (‘‘slow-blow’’) to electrical wires inside electrical handy box on back of Cooling Unit.
COOLING UNIT MUST BE PROPERLY GROUNDED. POWER CIRCUIT MUST BE MADE UP OF COPPER
CONDUCTORS, AND ALL WIRING MUST CONFORM TO NATIONAL AND LOCAL ELECTRICAL CODES.
DO NOT CONNECT ELECTRICAL POWER TO COOLING UNIT AT THIS TIME.