Carrier MINIMUM LOAD CONTROL ACCESSORY 30XA080-500- User Manual

Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.

Catalog No. 04-53300010-01

Printed in U.S.A.

Form 30XA-6SI

Pg 1

12-06

Replaces: New

Book 2

Tab

5c

Installation Instructions

Part No: 00EFN900002700A, 00EFN900002800A, 00EFN900002900A

SAFETY CONSIDERATIONS

Installing, starting up, and servicing air-conditioning equip-

ment can be hazardous due to system pressures, electrical com-

ponents, and equipment location.

Only trained, qualified installers and service technicians

should install, start up, and service this equipment.

When working on air-conditioning equipment, observe

precautions in the literature and on tags, stickers, and labels at-

tached to the equipment.

Follow all safety codes. Wear safety glasses and work

gloves. Use care in handling equipment.

GENERAL

This control accessory reduces 30XA chiller capacities be-

low the standard lowest capacity step. This capacity reduction

provides more precise control of leaving fluid temperature

during light load conditions.

The minimum load control solenoid valve limits the amount

of gas that can be bypassed from the condenser without

impacting oil return.

One accessory package is required for 30XA080-350 units.

Two accessory packages are required for 30XA400-500 units

to accommodate connections for three refrigerant circuits. See

Table 1 for accessory package usage.

Table 1 — Accessory Package Usage

INSTALLATION

Examine the package contents for correct part numbers. If

any of the components are damaged, file a claim with the

shipping company and notify your Carrier representative.

See Table 2A, 2B, or 2C for package contents. See Fig. 1 for

dimensional drawings of tubes included in the kit.

The following material is field supplied:

•

5

/

8

in. OD copper tubing

•

5

/

8

in. OD copper tube elbows and couplings

(as required)

• Loctite 554 thread sealing compound

• Parker Super O-lube O-ring lubricant

Install the Solenoid Valve Tube Assembly

1. Remove refrigerant charge from the circuits using an

approved refrigerant recovery device before proceeding

with this installation. Follow good piping practices.

2. Locate the discharge manifold for minimum load

piping on the side of the coil V for each circuit as

shown in Fig. 2. Locate the

1

/

2

in. NPT pipe plugs on

the top of the cooler for each circuit. See Fig. 3.

3. Remove the

1

/

2

in. NPT pipe plugs from the top of the

cooler. Use the thread sealing compound and install

one 1 in.-14 O-ring seal (ORS) x

1

/

2

in. NPT adapter

for each circuit. Lightly lubricate each O-ring with

O-lube and attach the tube assembly to each adapter.

See Fig. 3. Be sure to attach the correct tube assembly

to the cooler. Refer to the usage column in Tables 2A,

2B, and 2C for tube assembly part number correspond-

ing to the unit size and circuit. The nut on the tube

assembly should be torqued to 30 ft-lb (40 N-m).

4. Remove the trim panel on the discharge manifold for

minimum load piping on the side of the coil V. Use a

tubing cutter to cut 1

1

/

2

in. out from the discharge mani-

fold for each circuit. See Fig. 4. Braze a tee in between

the gap and, depending on the routing of the hot gas

bypass tubing, have the tee’s remaining port facing either

left or right.

5. Use field-supplied

5

/

8

in. OD copper tubing and fittings

(as required) to pipe from the solenoid valve outlet to the

5

/

8

in. port of the tee on the discharge manifold. Use the

provided

5

/

8

in. tubing clamps to secure the tubing to the

unit frame as necessary.

6. When piping is completed, leak test the assembly.
7. Evacuate, dehydrate, and recharge each circuit. Be sure to

use the correct type and amount of refrigerant listed in the

nameplate data and base unit documentation.

8. Restore power to the unit.

Be sure power to equipment is shut off before performing

maintenance or service to avoid electrocution. Lock out

and safety-tag all disconnects. There may be more than one

disconnect.

30XA UNIT SIZE

ACCESSORY PART NO.

080-240

00EFN9000002700A

260-300

00EFN9000002800A

325, 350

00EFN9000002900A

400

00EFN9000002700A,

00EFN9000002800A

450, 500

00EFN9000002800A,

00EFN9000002900A

30XA080-500

Minimum Load Control Accessory