Carrier HS070-160 manual Controls Troubleshooting Guide

30HR,HS070-160

Flotronic Plus Reciprocating Liquid Chillers

HEATING & COOLING

Controls Troubleshooting Guide

Alf Model E Units Have Microprocessor Controls

and Electronic Expansion Valves

CONTENTS

Page

S A F E T Y CONSlDERATlONS . . . . . . . . . . . . . . . . 1

FLOTRONIC PLUS CONTROL SYSTEM . . . . . l-4

Generat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

. PROCESSOR MODULE . . . . . . . . . . . . . . . . . . . 2 • LOW-VOLTAGE RELAY MODULE . . . . . . . . . 2

. EXV (ELECTRONK EXPANSION

VALVE) DRIVER MODULE . . . . . . . . . . . . . . . 2

. KEYBOARD AND DISPLAY MODULE . . . . . 2

. ELECTRONIC EXPANSION VALVE . . . . . . . . 3 • THERMISTORS . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

. CAPAClTY CONTROL . . . . . . . . . . . . . . . . . . . . 3

CONTROL SEQUENCE . . . . . . . . . . . . . . . . . . . . . 4,5

Off Cycle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Start-Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Capacity Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

• SEQUENCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Unit Shutdown . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Complete Unit Stoppage . . . . . . . . . . . . . . . . . . . . . 5

Single-Circuit Stoppage . . . . . . . . . . . . . . . . . . . . . 5

Lag Compressor Stoppage . . . . . . . . . . . . . . . . . . . 5

Restart Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

• GENERAL POWER FAlLURE . . . . . . . . . . . . . . 5

•BLOWN FUSE IN POWER FEED

DISCONNECT . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

•LOW WATER TEMPERATURE

CUTOUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

• AUXILIARY INTERLOCK . . . . . . . . . . . . . . . . . 5 • OPEN CONTROL CIRCUlT FUSE . . . . . . . . . . 5

. FREEZE PROTECTION . . . . . . . . . . . . . . . . . . . . 5 a HIGH-PRESSURE SWITCH . . . . . . . . . . . . . . . . 5

• LOSS OF CHARGE SWITCH . . . . . . . . . . . . . . . 5

. COMPRESSOR DISCHARGE TEMPERATURE SWITCH . . . . . . . . . . . . . . . . . 5

. OIL SAFETY SWITCH . . . . . . . . . . . . . . . . . . . . . 5

CONTROLS OPERATION . . . . . . . . . . . . . . . . . . .5-l I

Accessing Functions and Subfunctions. . . . . . . 5

Qisplay Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

a SUMMARY			DISPLAY		5
.	STATUS	FUNCTION			5
.	TEST FUNCTION				10
Programming			Functions		1 I
.	SERVlCE FUNCTION				11
•	SET POINT			FUNCTION	11
•	SCHEDULE			FUNCTION	11
TROUBLESHOOTING					12-26
Checking		Display Codes			1 2
•	OPERATING			MODE CODES	12
.	ALARM CODES				12
Quick Test . . . .				. . . . . . . . . . . . . . . . . . . . . . . . . . . . .	1 4
Electronic		Expansion Valves			1 9
•	CHECKOUT			PROCEDURE	19
•	EXV OPERATION				21
Thermistors . . .				. . . . . . . . . . . . . . . . . . . . . . . . . . . . .	2 2
•	LOCATION		.	. . . . . . . . . . . . . . . . . . . . . . . . . . . . .	22
•	SENSOR		REPLACEMENT		22
Modules			. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		2 3

SAFETY CONSIDERATIONS

Installation, start-up and servicing of this equipment can be hazardous due to system pressures, electrical components and equipment location.

Only trained, qualified installers and service mechanics should install, start-up and service this equipment.

When working on the equipment, observe precautions in the literature, tags, stickers and labels attached to the equipment and any other safety precautions that apply.

•Follow all safety codes.

0 Wear safety glasses and work gloves.

•Use care in handling, rigging and setting bulky equipment.

•Use care in handling elcetronic components.

ELECTRII~ SHOCK HAZARD.

Open all remote disconnects before servicing this equipment.

This unit uses a micreprocessor-based electronic

control system. 190 not use jumpers or other tools to short out components, bypass or otherwise depart

from recommcndcd p r o c e d u r e s . A n y short-to- ground of the control board or accompanying wiring may destroy the electronic modules or electrical component.

FLOTRONIC PLUS CONTROL SYSTEM

General - T h e 30HR,HS Flotronic Plus chillers feature microprocessor-based electronic controls and an electronic expansion valve (EXV) in each refrigeration circuit.

The Flotronic Plus control system cycles compressors and compressor unloaders to maintain the selected leav- ing water temperature set point. It automatically posi- tions the EXV to maintain the specified refrigerant superheat entering the cylinders of the compressor. Safeties are continuously monitored to prevent the unit from operating under unsafe conditions. A scheduling function, programmed by the user, controls the unit occupied/ unoccupied schedule. The control also operates a Quick Test program that allows the operator to check input and output signals to the microprocessor.

The control system consists of a processor module (PSIO), low-voltage relay module (DSIO), electronic expansion valve (EXV), EXV driver module (DSIO), keyboard and display module (HSIO) and thermistors to provide analog inputs to the microprocessor. The soft- ware resides in the PSIO.