Carrier Flotronic 30GT040 Controls And Troubleshooting

30GT040-420
Flotronic™ Reciprocating Liquid Chillers
50/60 Hz
2, Controls and Troubleshooting
ObE SENT = HER wIeETi Cc
{jj CONTENTS o
yn
Page
GENERALS Peretti cies cones Meatepatacgater «in « if
SAFETY CONSIDERATIONS .................. 1
INTRODUCTION ..................0- 22sec eee 1,2
FLOTRONIC CONTROL SYSTEM ............ 2-14
General... tees... nee
Processor Board
Relay Board ...............
Display Board .....................0.2 eee ee
Thermistors'328 >... 2... .... eer ies
Electronic Expansion Valves (EXV) .......... 11
Thermostatic Expansion Valves (TXV) ....... i
Compressor Protection Control System
(CPCS) or Control Relay (CR) ............. 13
Compressor Ground Current Protection
Board (CGF) and Control Relay (CR) .......
Accessory Reset Board 1 14
Demand Limit Control Module ...........:...
OPERATING INFORMATION ..............-.
Digital Display ..................2...... 000s:
QUICKSTOSt. etre inert. eee + os re Ss
Capacity Control — Operating Sequence..... 20
Electronic Expansion Valve (EXV) 2
tiead Pressure Control ................ ra
Return Temperature Reset .........2........
Space and Outdoor-Air Temperature
RESCUE an cen « te ie. mM.
Demand Limiting :
Pulldown Control
Dual Set Point Requirement
ACCESSORIES AND OPTIONAL CONTROLS
INSTALLATION .............2.0...2.00005 2
Pulldown Control ........... ae
Return Temperature Reset
Demand Limit Contro! Module.
Remote On-Off Control ...............~..-.
External Interlocks ee a io
Remote Alarm ...................---..09
CONTROLS TROUBLESHOOTING AND
SERVICING, paar hee ek eRe a 30-43
Generals = Ses yo ae
Diagnostic Display Codes 3
Processor Board Checkout Procedure ....... 36
Processor Board Replacement .............. 38
Relay Board Troubleshooting ............... 38
Display Board Checkout ...................- 39
Accessory Reset Board Checkout ........... 39
Compressor Protection Control System
(CPCS), Board Wry... a en ee 39
Compressor Ground Current Board (CGF)
(30GT130-210, 230A-315A, and
330A/B-420A/B) ....... 22-0500 ee eee 39
. Thermistor Troubleshooting ................. 40
EXV Troubleshooting ....................... 40
~
elise >
6 SONS
Caf i O GENERAL
Unit sizes 230-420 are modular units which are shipped
as separate sections (modules A and B). Installation instruc-
tions specific to these units are shipped inside the individual
modules. See Table 1 for a listing of unit sizes and modular
combinations. For modules 230B-315B, follow all general
instructions as noted for unit sizes 080-110. For all remain-
ing modules, follow instructions for unit sizes 130-210.
SAFETY CONSIDERATIONS
Installing, starting up, and servicing this equipment can
be hazardous due to system pressures, electrical compo-
nents, and equipment location (roofs, elevated structures, etc.).
Only trained, qualified installers and service mechanics
should install, start up, and service this equipment.
Untrained personnel can perform basic maintenance func-
tions, such as cleaning coils. All other operations should be
performed by trained service personnel.
When working on the equipment, observe precautions in
the literature and on tags, stickers, and labels attached to the
equipment. -
* Follow all local safety codes. :
* Wear safety glasses and work gloves.
¢ Use care in handling, rigging, and setting Bulky,
equipment,
* Use care in handling electronic components.
ELECTRIC SHOCK HAZARD
Open all remote disconnects before
servicing this equipment.
_
INTRODUCTION Te
This publication'contains information on the electronic con- _
trol system, and control system troubleshooting for the
30GT040-420 Flotronic liquid chillers and Flotronic units
with factbry-installed options (FIOP).
The Flotronic chillers are equipped with electronic ex-
pansion valves (EXVs) or, on 040-110 FIOP units, conven-
tional thermostatic expansion valves (TXVs). The 040-110
- FIOP chillers are aiso equipped with liquid line solenoid valves
(LLSV).
NOTE: TXVs are not available on modular units.
Differences in operations and controls between standard
"and 040-110 FIOP units are noted in appropriate sections in
this publication. Refer to the Installation, Start-Up and Sery-
ice Instructions and the Wiring Diagrams for the appropriate
unit for further details.
~
Tab [5c - Fd ie oY Z "A
vate —
a A Se eee = seen a