Emerson Copeland 3290262 Manuale

TI_Unit_CO2_Stream_04_EN_Rev00 Ident number 3293976 (P/N 900-0010-00/Rev00) 1/3

Date of last update: Aug-22

Ref: TI_Unit_CO2_Stream_04_EN_Rev00

Application Engineering Europe

COPELAND™ CO2 REFRIGERATION UNITS

CHANGEOVER VALVE SERVICE KIT

This technical information provides instructions for the replacement of the changeover valve on Copeland CO2

refrigeration units. These instructions are valid only for Copeland CO2refrigeration units with M24x1.5 thread on the

PRV’s connected to the liquid receiver through the changeover valve. If the pressure relief valves (PRV’s) cannot be

disassembled from the changeover valve, it is necessary to replace the complete assembly (changeover valve +

PRV’s). The PRV version with metric thread M24x1.5 cannot be used anymore. The PRV on the high-pressure side

is not affected by this change.

The service kit N°3290262 includes the components shown in the table below.

Components

Description

Quantity

Ident & Part

number

Valve-Change-Over 1/2"NPT

Changeover valve

3290262

510-1018-00

Valve-Safety assm 90 bar

Pressure relief valve (PRV)

3288776

(510-0902-01)

User manual - CV Kit

Instruction

3293976

(900-0010-00)

Table 1: BOM of changeover valve service kit

When replacing the changeover valve including PRV’s, the instructions in this technical information must be carefully

followed. Use the recommended torque at each step.

Only qualified and authorized HVAC or refrigeration personnel are permitted to conduct the changes described in

this technical information. All appropriate safety measures must be considered.

Replacement of changeover valve:

▪Release all the pressure/refrigerant from the unit (Figure 1).

▪Disassemble the changeover valve from the liquid receiver (Figure 2).

▪Connect a nitrogen hose to the liquid receiver so that no thread debris can fall into it (Figure 3).

▪Clean the liquid receiver thread (Figure 3).

Figure 1 Figure 2 Figure 3

TI_Unit_CO2_Stream_04_EN_Rev00 Ident number 3293976 (P/N 900-0010-00/Rev00) 2/3

▪Apply teflon sealing tape (0.1x12 mm) to the changeover valve by 5 to 6 turns clockwise (Figure 4).

▪Mount the changeover valve onto the liquid receiver; torque to 50 Nm (Figure 5).

▪Apply teflon sealing tape (0.1x12 mm) to both NPT PRV‘s by 5 to 6 turns clockwise (Figure 6).

Figure 4 Figure 5 Figure 6

▪Mount both PRV‘s into the changeover valve; torque to 40 Nm (Figure 7).

▪Turn the spindle into middle position so that both PRV ports are open (Figure 8).

▪Close the shut-off valves on the compressor (discharge port) and on the liquid receiver (Figure 9).

▪Open the high-pressure valve and perform a bubble leak test on all connections between liquid receiver,

changeover valve and PRV’s (Figure 10).

▪Pressurize the liquid receiver with nitrogen (5 bar) and perform a preliminary leak test.

▪Perform the final leak test at 80 bar.

Figure 7 Figure 8 Figure 9

Figure 10

TI_Unit_CO2_Stream_04_EN_Rev00 Ident number 3293976 (P/N 900-0010-00/Rev00) 3/3

▪Mount the deflector and tighten it manually to 1-5 Nm (Figures 11 & 12).

▪The changeover valve must be fully open during unit operation (spindle out Figures 13 & 15).

▪Mount the spindle cap and check the presence of the copper gasket (Figure 14).

Figure 11 Figure 12 Figure 13 Figure 14

Figure 15

Spindle protective cap

Spindle "open" / "closed"

Seal gland

40 Nm

25 Nm

15 Nm

Table 2: Torques on the changeover valve in Nm

NOTE: For information on the maintenance and lifetime of the PRV, please refer to the unit application

guidelines.

- The contents of this publication are presented for informational purposes only and are not to be construed as warranties or guarantees, express or implied, regarding

the products or services described herein or their use or applicability.

- Emerson Climate Technologies GmbH and/or its affiliates (collectively "Emerson"), as applicable, reserve the right to modify the design or specifications of such

products at any time without notice.

- Emerson does not assume responsibility for the selection, use or maintenance of any product. Responsibility for proper selection, use and maintenance of any

Emerson product remains solely with the purchaser or end user.

- Emerson does not assume responsibility for possible typographic errors contained in this publication.

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