Carrier 30HX076-271 installation instructions Contents, Introduction, Safety Considerations

30GX080-176 30HX076-271 Minimum Load Control Accessory 50/60 Hz

Installation Instructions

Part Nos. 30HX-900---008, 30GX-900---004

(60 Hz Ð 115-v Control)

Part Nos. 30HX-900---009, 30GX-900---005

(50 or 60 Hz Ð 230-v Control)

CONTENTS

Page

SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . 1

INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6

Step 1 Ð Examine Package Contents . . . . . . . . . 1

Step 2 Ð Install Piping . . . . . . . . . . . . . . . . . . . . . . . 2

·REMOVE MINIMUM LOAD PORT PLUGS AND INSTALL FITTINGS

·INSTALL PIPING

·INSTALL BALL AND SOLENOID VALVES

·CONNECT PIPING

Step 3 Ð Dehydrate and Recharge Circuit . . . . . 3 Step 4 Ð Install Control Wiring . . . . . . . . . . . . . . . 4

·30HX UNITS

·30GX UNITS

·ALL UNITS

Step 5 Ð Con®gure Unit for Minimum

Load Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Step 6 Ð Test Minimum Load Relay

Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Step 7 Ð Adjust Setting of Minimum Load

Ball Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Follow all safety codes. Wear safety glasses and work gloves. Use care in handling equipment.

Be sure power to equipment is shut off before perform- ing maintenance or service.

IMPORTANT: When removing refrigerant, use an approved refrigerant recovery device. Do not vent re- frigerant into the atmosphere.

INTRODUCTION

The minimum load control accessory allows 30HX and 30GX chillers to have their capacities decreased below the standard fully unloaded condition. The accessory provides more precise control of leaving ¯uid temperature during light load conditions.

The 30GX and 30HX chillers have a dual-circuit design. Each minimum load control accessory package contains the items required for both circuits. Because of an automatic lead/ lag feature on the chillers, the accessory should be installed on both circuits.

SAFETY CONSIDERATIONS

Installing, starting up, and servicing air-conditioning equip- ment can be hazardous due to system pressures, electrical components, and equipment location.

Only trained, quali®ed installers and service technicians should install, start up, and service this equipment.

When working on air-conditioning equipment, observe pre- cautions in the literature and on tags, stickers, and labels at- tached to the equipment.

INSTALLATION

Step 1 Ð Examine Package Contents Ð Pack- age includes solenoid valves, ball valves, Swagelok con- nectors, and instructions. The kit for 30GX units also con- tains a junction box, junction box cover, and conduit. Examine each item. If any part is damaged or missing, ®le a claim immediately with the shipper. See Table 1 for accessory pack- age contents and ®eld-supplied material.

Table 1 Ð Accessory Package Contents and Field-Supplied Material

ACCESSORY PACKAGE			ACCESSORY PART NUMBER
COMPONENTS		30HX-900---008	30HX-900---009	30GX-900---004	30GX-900---005
Solenoid Valve		(2) EF23JX212	(2) EF23JX231	(2) EF23JX212	(2) EF23JX231
Ball Valve		(2) EP71BA201	(2) EP71BA201	(2) EP71BA201	(2) EP71BA201
Swagelok Connector		(4) DC09CA307	(4) DC09CA307	(2) DC09CA307	(2) DC09CA307
Junction Box		Ð	Ð	HX30FZ001	HX30FZ001
Junction Box Cover		Ð	Ð	HX38ZZ001	HX38ZZ001
Watertight Conduit		Ð	Ð	99CD2121AC028	99CD2121AC028
	FIELD SUPPLIED MATERIAL Ð REQUIRED PARTS (Ordered Separately)
5¤8-in. OD Copper Tubing, Wiring, Conduit,				Field Supplied
Thread Sealant, Electrical Supplies

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

Book	2	PC 903	Catalog No. 563-056	Printed in U.S.A.	Form 30GX,HX-2SI	Pg 1	1-97	Replaces: New
Tab	5c