CeilAir CW series Betreibershandbuch PDF herunterladen (Seite 22)

(©July, 2008)

CeilAiR OHS Series Installation, Operation & Maintenance Manual

ir Technology Systems, Inc.

2-11

to the surface of the unit. If the factory installed, non-

fused service switch option was purchased, the main

power and ground connection shall be located at the

non-fused service switch, otherwise, the main power

connection shall be located as stated below.

Each unit is provided with pilot hole(s) in the main

power and control panel for connection of the field-

wiring. These pilot holes are located near the electrical

box and a label stating "MAIN POWER INPUT" is in

close proximity. Terminate the main power wires at the

line side of the main power distribution block located

within the electric box. A separate equipment ground

lug is provided within the electrical box for termination

of the earth ground wire.

2.7.1.1 Single-Phase Units 208/230V

Units that are designed for a 208V-supply voltage must

have a tolerance that is within -5% and +10%. If the

measured supply voltage is 230V, the unit can operate

with a tolerance of ±5% if the following change is

performed. The control transformers within the system

must have the primary wire connected to its respective

240V tap instead of the 208V tap.

2.7.1.2 Single-Phase Units 277V

Single-phase units require that the hot leg of power be

connected to terminal L1 and the neutral wire to

terminal L2 of the main power distribution block.

2.7.1.3 Single-Phase Units (208/230V) with

277/230V Buck/Boost Transformer

Applications (See Figure 6)

Certain applications may require the purchase of a unit

designed for a 208V, 1PH, 60Hz power supply and

supplied with a 277V/230V buck/boost transformer.

This configuration allows the equipment to operate

from a customer supplied 277V, 1PH, 60Hz power

supply. The purpose of the buck/boost transformer is

to convert the incoming 277V, 1PH, 60Hz power

supply to the required 230V, 1PH, 60Hz power supply

for unit operation. If the incoming power supply is

within the range of 277V plus 5%, the control trans-

formers within the system must have the primary wire

connected to its respective 240V tap instead of the

208V tap.

NOTE

Prior to operation, an adequate unit-to-earth earth

ground must be connected to the unit

Figure 6- Transformer Schematic

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