CeilAir CW series Instrukcja Operatora Pobierz pdf (Strona 23)

(©July, 2008)

CeilAiR OHS Series Installation, Operation & Maintenance Manual

ir Technology Systems, Inc.

2-12

Upon examination of the buck/boost transformer, it

may be observed that the labeled primary voltage is

120, 240 and/or 480 while the secondary voltage is 12,

16, 24, 32 and/or 48 but not limited to these specific

voltages. This transformer is designed as an insulating

transformer but if wired in a configuration recom-

mended by the manufacturer it will change its electri-

cal characteristics to those of an autotransformer

(buck/boost transformer). The primary and secondary

windings are no longer insulated, which in this design

produces a lower voltage ratio between the primary

and secondary windings. This new wiring configuration

also results in an increased KVA capacity.

It should be noted that the 277V/230V buck/boost

transformer provided with the equipment has been

properly sized and is approved for use as a buck/boost

transformer. The buck/boost transformer must be

installed, wired and provided with overcurrent protec-

tion in accordance with local and national electrical

code requirements. Please refer to the electrical

schematic supplied with the unit for field connections.

A disconnecting means is required for the system;

sizing and location will depend on the location of the

buck/boost transformer with regards to the unit. In

addition, wire sizing and overcurrent protection must

be provided in accordance with the unit nameplate

information between the buck/boost transformer and

the unit.

NOTE

This transformer is used on a wide variety of

applications. Use the wiring instructions (the

same instructions are supplied with the trans-

former) for the correct wiring method. Care should

be taken in wiring the transformer in accordance

with the supplied wiring schematic.

Connections are as follows:

1. Splice the hot leg (L1) of the 277V inlet to (X1) (2

wires under this splice cap).

2. Splice the neutral leg (L2) of the 277V inlet to H4,

H2 and the wire terminating at L2 of the unit main

power distribution block (4 wires under this splice

cap).

3. Splice wires (X2) and (X3) together (2 wires under

this splice cap).

4. Splice (H3), (H1), (X4) and the wire terminating at

L1 of the unit main power distribution block (4

wires under this splice cap).

5. The transformer chassis should be grounded.

After all wiring connections are complete, check the

voltage at the main power distribution block in the

unit's electrical box to ensure the unit has the correct

voltage.

2.7.1.4Three-Phase Units

Three-phase units are designed to have the L1, L2 and

L3 supply wires connected to corresponding L1, L2 and

L3 line terminals of the main power distribution block.

The unit will operate correctly if the supply wires are

connected in this manner. A ground lug is provided in

each unit near the distribution block.

CAUTION

Improper wire connections will result in the

reverse rotation of the fans/blower motors and

compressor (if applicable) and may eventually

result in damage to the scroll compressor. To

correct this problem, exchange any two of the

incoming main power wires at the main power

distribution block. Do NOT rewire the unit's

individual components.

2.7.2 Controls

SATS offers a wide range of control systems to solve

your air conditioning control/alarm requirements. Refer

to your specific system to identify which control

package was purchased. This section will cover the

electrical wiring of the A-Tech-1.1 and A-Tech-1.2 thermo-

stats with optional humidistat/dehumidistat controls. If

you purchased a C-Tech-10, A-Tech-20 or C6000

controller, a supplemental manual was sent with your

unit. Refer to it and the wiring diagram(s) provided for

utility connections. The air conditioning system is

provided with a pilot hole for a conduit connection for the

control wiring. It is located near the electrical box in close

proximity to the main power pilot hole. The sizing of the

conduit must be per the local and national electrical code

requirements.

NOTE

All customer provided wiring must be in accor-

dance with local and national electrical code re-

quirements for Class 2 circuits.

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