Carrier GY Betriebsanleitung PDF herunterladen (Seite 16)

Four evaporator tubes are swaged into the end plate and cannot

be removed. A dot punch mark in the end plate opposite each

one identifies each of them. If any of them develop a leak, the

tube must be plugged, as described below.

Plugging evaporator tubes

A leaking tube can be plugged pending replacement. The

number of tubes plugged will determine when they should be

replaced. Check with Carrier the effect upon chiller performance

of plugging a number of tubes. Carrier will need to know the

number of tubes to be plugged and their positions. The figure

below shows the Elliott method of plugging tubes.

WARNING: Take care when inserting plugs not to damage the

plate material between the tubes. Avoid excessive force. Clean

all components with Locquic N and then coat all surfaces with

several drops of Loctite 75 to ensure a good seal without

applying excessive force.

Elliott tube plug

30GV and 30GY 020-059

Components Part number

Tube brass plug ---T-853--103500S-*

Tube brass ring ---T-853--002570S-*

Brass plug (holes without tubes) ---T-853--1031—S-*

Brass ring (holes without tubes) ---T-853--002631S-*

Loctite No. 75*

Locquic “N”*

*Order directly from your Carrier distributor

Replacing cooler tubes

Retubing must be done only by a properly trained service

engineer. Most standard practices can be applied, but for cooler

tubes a 5% crush allowance is made for tube expansion and

twisting (15.87 mm diameter tubes are used in these coolers).

The table below gives the specification of the materials used.

Example:

Tube sheet hole diameter 16.00 mm

Tube outside diameter 15.87 mm

Clearance 0.13 mm

Tube inside diameter before rolling 14.27 mm

Tube inside diameter after rolling 14.48 mm

NOTE: Tubes next to the gasket webs must be flush with the

tube sheets at either end of the cooler.

with adhesive, and stick them together.

• Let the joint dry for 5 minutes.

• Moisten the joint with a small amount of compressor oil.

• Reinstall the evaporator head within 30 minutes.

Preparation of gaskets

When rebuilding the cooler, new gaskets must always be used.

They must conform to the Carrier specification for compressed

gaskets.

• Clean the gasket and its place on the tube sheet.

• Cover the two matching surfaces (gasket and tube sheet)

Tightening cooler head bolts

Cooler head bolts must be tightened in the specified sequence

and to the correct torque.

Use this tightening sequence:

• Hand tighten the four bolts as shown below in stage 1.

• Hand tighten the next four bolts as shown below in stage 2.

• Starting at the 12 o'clock position, and working clockwise,

insert and hand tighten the remaining outer bolts.

• Insert and tighten the six screws in the centre of the head.

• Starting again at 12 o'clock and working clockwise,

tighten the outer bolts to the correct torque.

• Not less than one hour later insert and tighten the six bolts

in the centre of the head, using the torque values given.

• After the cooler has been refilled with clean refrigerant,

use a soap and water solution or an electronic detector to

confirm that there are no leaks.

• Replace the evaporator insulation and temperature sensors.

Condenser coil

We recommend, that finned coils are inspected regularly to

check the degree of fouling. This depends on the environment

where the unit is installed, and will be worse in urban and

industrial installations and near trees that shed their leaves.

Proceed as follows:

• Remove fibres and dust collected on the condenser face

with a soft brush.

• Clean the coil with the appropriate cleaning agents.

We recommend TOTALINE products for coil cleaning:

Part No. P902 DT 05EE: traditional cleaning method

Part No. P902 CL 05EE: cleaning and degreasing.

These products have a neutral pH value, do not contain

phosphates, are not harmful to the human body, and can be

disposed of through the public drainage system.

Depending on the degree of fouling both products can be used

diluted or undiluted.

Bolt size M12 - 71-87 Nm

Bolt size M16 - 171-210 Nm

Bolt size M20 - 171-210 Nm

Stage 1

Stage 2

1 2 ... 11 12 13 14 15 16 17 18 19 20

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