Carrier HS070-160 User Manual
HEATING
COOLING
Flotronic Plus Reciprocating Liquid Chillers
Controls Troubleshooting Guide
Model E Units Have Microprocessor Controls
and Electronic Expansion Valves
CONTENTS
SAFETY CONSIDERATIONS
Page
S A F E T Y
. . . . . . . . . . . . . . . .
1
FLOTRONIC PLUS CONTROL SYSTEM . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2
.
PROCESSOR MODULE . . . . . . . . . . . . . . . . . . .
2
l
LOW-VOLTAGE RELAY MODULE . . . . . . . . .
2
. EXV
EXPANSION
VALVE) DRIVER MODULE . . . . . . . . . . . . . . .
2
.
KEYBOARD AND DISPLAY MODULE . . . . . 2
.
ELECTRONIC EXPANSION VALVE . . . . . . . . 3
l
THERMISTORS . . . . . . . . . . . . . . . . . . . . . . . . . . .
3
.
CONTROL . . . . . . . . . . . . . . . . . . . .
3
CONTROL SEQUENCE . . . . . . . . . . . . . . . . . . . . .
Off Cycle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Off Cycle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4
Start-Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4
Capacity Control . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4
l
SEQUENCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4
Unit Shutdown . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5
Complete Unit Stoppage . . . . . . . . . . . . . . . . . . . . .
5
Single-Circuit Stoppage . . . . . . . . . . . . . . . . . . . . .
5
Lag Compressor Stoppage . . . . . . . . . . . . . . . . . . .
5
Restart Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . .
5
l
GENERAL POWER
. . . . . . . . . . . . . .
5
l
BLOWN FUSE
POWER FEED
DISCONNECT . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5
l
LOW WATER TEMPERATURE
CUTOUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5
l
AUXILIARY INTERLOCK . . . . . . . . . . . . . . . . .
5
l
OPEN CONTROL
FUSE . . . . . . . . . .
5
.
FREEZE PROTECTION . . . . . . . . . . . . . . . . . . . .
5
HIGH-PRESSURE SWITCH . . . . . . . . . . . . . . . .
5
l
LOSS OF CHARGE SWITCH . . . . . . . . . . . . . . .
5
. COMPRESSOR DISCHARGE
TEMPERATURE SWITCH . . . . . . . . . . . . . . . . .
5
.
OIL SAFETY SWITCH . . . . . . . . . . . . . . . . . . . . .
5
CONTROLS OPERATION . . . . . . . . . . . . . . . . . .
I
Accessing Functions and Subfunctions. . . . . . . 5
Functions . . . . . . . . . . . . . . . . . . . . . . . . . . .
5
SUMMARY DISPLAY . . . . . . . . . . . . . . . . . . . . .
5
.
STATUS FUNCTION . . . . . . . . . . . . . . . . . . . . . .
5
.
TEST FUNCTION . . . . . . . . . . . . . . . . . . . . . . . .
10
Programming Functions . . . . . . . . . . . . . . . . . . . .
1
.
FUNCTION . . . . . . . . . . . . . . . . . . . .
11
l
SET POINT FUNCTION . . . . . . . . . . . . . . . . . .
l
SCHEDULE FUNCTION . . . . . . . . . . . . . . . . . .
11
TROUBLESHOOTING
. . . . . . . . . . . . . . . . . . . . .
12-26
Checking Display Codes . . . . . . . . . . . . . . . . . . . .
1 2
l
OPERATING MODE CODES . . . . . . . . . . . . . .
12
.
ALARM CODES . . . . . . . . . . . . . . . . . . . . . . . . .
12
Quick Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1 4
Electronic Expansion Valves . . . . . . . . . . . . . . . .
1 9
l
CHECKOUT PROCEDURE . . . . . . . . . . . . . . .
19
l
EXV OPERATION . . . . . . . . . . . . . . . . . . . . . . . .
21
Thermistors
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2 2
l
LOCATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
22
l
SENSOR REPLACEMENT . . . . . . . . . . . . . . . .
22
Modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2 3
Installation, start-up and servicing of this equipment
can be hazardous due to system pressures, electrical
components and equipment location.
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
equipment and any
safety precautions that apply.
l
Follow all safety codes.
Wear safety glasses and
gloves.
l
Use care in handling, rigging and setting bulky
equipment.
l
Use care in handling
components.
SHOCK
HAZARD.
Open all remote disconnects before
this equipment.
This unit uses a
electronic
control system.
not use jumpers or other tools
to short out components, bypass or otherwise depart
from
from
p r o c e d u r e s . A n y
ground of the control
or accompanying wiring
may destroy the electronic modules or electrical
component.
component.
FLOTRONIC PLUS CONTROL SYSTEM
General
T h e
Flotronic Plus chillers
feature microprocessor-based electronic controls and an
electronic expansion valve (EXV) in each refrigeration
circuit.
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
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
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),
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.