Carrier HS070-160 Troubleshooting Manual

HEATING COOLING
Controls Troubleshooting Guide
CONTENTS
S A F E T Y CONSlDERATlONS . . . . . . . . . . . . . . . .
FLOTRONIC PLUS CONTROL SYSTEM . . . . .
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. PROCESSOR MODULE . . . . . . . . . . . . . . . . . . .
LOW-VOLTAGE RELAY MODULE . . . . . . . . . 2
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. EXV (ELECTRONK EXPANSION
VALVE) DRIVER MODULE . . . . . . . . . . . . . . .
. KEYBOARD AND DISPLAY MODULE . . . . . 2
. ELECTRONIC EXPANSION VALVE . . . . . . . . 3
THERMISTORS . . . . . . . . . . . . . . . . . . . . . . . . . . .
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. CAPAClTY CONTROL . . . . . . . . . . . . . . . . . . . .
CONTROL SEQUENCE . . . . . . . . . . . . . . . . . . . . .
Off Cycle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Start-Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Capacity Control . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SEQUENCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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Unit Shutdown . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Stoppage . . . . . . . . . . . . . . . . . . . . .
Complete Unit
Single-Circuit Stoppage . . . . . . . . . . . . . . . . . . . . .
Lag Compressor Stoppage . . . . . . . . . . . . . . . . . . .
Restart Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . .
GENERAL POWER FAlLURE . . . . . . . . . . . . . .
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BLOWN FUSE IN POWER FEED
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DISCONNECT . . . . . . . . . . . . . . . . . . . . . . . . . . . .
LOW WATER TEMPERATURE
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CUTOUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
AUXILIARY INTERLOCK . . . . . . . . . . . . . . . . .
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OPEN CONTROL CIRCUlT FUSE . . . . . . . . . . 5
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. FREEZE PROTECTION . . . . . . . . . . . . . . . . . . . .
LOSS OF CHARGE SWITCH . . . . . . . . . . . . . . .
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. COMPRESSOR DISCHARGE
TEMPERATURE SWITCH . . . . . . . . . . . . . . . . .
. OIL SAFETY SWITCH . . . . . . . . . . . . . . . . . . . . .
CONTROLS OPERATION . . . . . . . . . . . . . . . . . . .5-l I
Accessing Functions and
Functions . . . . . . . . . . . . . . . . . . . . . . . . . . .
. STATUS FUNCTION . . . . . . . . . . . . . . . . . . . . . .
. TEST FUNCTION . . . . . . . . . . . . . . . . . . . . . . . .
Functions . . . . . . . . . . . . . . . . . . . .
Programming
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SET POINT FUNCTION . . . . . . . . . . . . . . . . . .
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SCHEDULE FUNCTION . . . . . . . . . . . . . . . . . .
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TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . .
Checking Display Codes . . . . . . . . . . . . . . . . . . . .
OPERATING MODE CODES . . . . . . . . . . . . . .
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. ALARM CODES . . . . . . . . . . . . . . . . . . . . . . . . .
Quick Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Electronic Expansion Valves . . . . . . . . . . . . . . . .
CHECKOUT PROCEDURE . . . . . . . . . . . . . . .
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EXV OPERATION . . . . . . . . . . . . . . . . . . . . . . . .
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Thermistors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
LOCATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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SENSOR REPLACEMENT . . . . . . . . . . . . . . . .
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Modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Flotronic Plus Reciprocating Liquid Chillers
and Electronic Expansion Valves
Page
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Subfunctions. . . . . . . 5
5
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10
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12-26
1 2
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12
1 4
1 9
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2 2
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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.
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Use care in handling, rigging and setting bulky
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equipment.
Use care in handling elcetronic components.
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Open all remote disconnects before
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
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
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.
SHOCK HAZARD.
Flotronic Plus chillers
the user, controls the unit