Carrier GY Instrukcje Operacyjne Pobierz pdf (Strona 8)

Preliminary checks

Before installing and connecting the unit check:

- The required clearances for correct unit operation and

maintenance.

- Size and location of the chilled water piping.

- Location and electrical characteristics of the available

power supply which must agree with the unit nameplate

rating.

- Location and correct installation of the ductwork.

- That there is not only sufficient space for routine service

and maintenance work, but also for operations such as: fan

shaft inspection, compressor removal etc. Refer to the

certified drawings for the units.

Positioning

Once the unit has been installed in its final location, remove the

skids, level the unit with a spirit level and bolt it to the floor or

to a pad.

CAUTION: These units must not be installed outside, except

under cover.

If it is necessary to locate the unit on an upper floor, be sure

that the structure is designed to support the weight. If required,

strengthen the floor. Also ensure that the installation surface is

level. Check the dimensional drawing for unit dimensions and

weight distribution.

Positioning of the 30GV/GY 044-059 units

Mechanical connection

Step 1

- First position unit B (the control box of this unit does not

include a disconnect switch).

- Fasten beams 2 and 3 with screw 6 and washer 7 to unit B.

- Move unit A close so that it can be fastened to beams 2

and 3 from the inside of the unit.

Step 2

- Fasten panel 4 to the front of the assembly using screws 6

and washers 7, and panel 5 to the rear of the assembly

using screws 6 and washers 7.

- Fasten the control box to front panel 4, which was

previously fastened with screws 6 and washers 7.

Duct connections

The fan motor assembly is mounted on a self-supporting frame,

and permits connection to a ductwork system without using

additional flexible connections.

Suction side

When designing ducts, the possible installation of accessory

filters and air dampers must be taken into consideration. For

30GV,GY 044-059 units it is preferable to leave the two

suction openings free. The units will also function correctly

with only one suction opening. In this case it is necessary to

increase the fan speed of the rear unit (in this case unit B) by

8% in relation to the front unit (unit A with direct air intake, in

order to balance the air flows for the two modules.

Discharge side

For units 30GV,GY 025-035 the selection curves are based on

a connection separated by two ducts (four for 30GV, GY 044

to 059). If this is not the case, the additional pressure, which is

due to the change in the dynamic pressure, must be taken into

account (see table below).

CAUTION: The following rules for centrifugal fans must

always be adhered to, in order to ensure that the maximum

power input of the motor is not exceeded:

- The fan must not be rotated without the panels being fitted.

- The unit should not be operated without a discharge duct.

Use panels to ensure that the suction or discharge opening

cannot obstructed (e.g. bottom supply or opening of doors).

Minimum outdoor operating temperature (

°C)

Unit size 020 025-059

% load 100 50 100 66 33

Single-speed motor 10 12 10 12 14

Two-speed motor 0 2 0 2 4

Dampers -20 -20 -20 -20 -20

Fan module

Before the final start-up of the unit, check that the ductwork is

correctly attached to the unit. After checking the correct

positioning of the pulley elements on the shaft and the belt

tension, the fan motor must be switched on, as follows:

1. Check the rated motor current on the nameplate.

2. Check that all panels are fitted.

3. Start the fan motor using a contactor. Measure the current. If

the value is higher than the value established in step 1, or

more than 15% below that value, it may be necessary to

adjust the fan speed as shown in the following tables:

6 - 7

Unit B

6 - 7

Unit A Unit B

1 2 3 4 5 6 7 8 9 10 11 12 13 ... 19 20

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Carrier GY Instrukcje Operacyjne Strona 8

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