Carrier 30XA080-500 installation instructions Safety Considerations, General, Installation

30XA080-500 Minimum Load Control Accessory

Installation Instructions

Part No: 00EFN900002700A, 00EFN900002800A, 00EFN900002900A

SAFETY CONSIDERATIONS INSTALLATION

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.

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.

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

30XA UNIT SIZE	ACCESSORY PART NO.
080-240	00EFN9000002700A
260-300	00EFN9000002800A
325, 350	00EFN9000002900A
400	00EFN9000002700A,
	00EFN9000002800A
450, 500	00EFN9000002800A,
	00EFN9000002900A

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 11/2 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.

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

Book	2	Catalog No. 04-53300010-01	Printed in U.S.A.	Form 30XA-6SI	Pg 1	12-06	Replaces: New
Tab	5c