Carrier HS070-160 Manual De Usuario

 The 

 control panel is shown in

Fig. 1.
PROCESSOR MODULE 

 This module contains the

operating software and controls  the  operation of the
machine. It continuously monitors information received

from the various temperature thermistors and communi-
cates with the relay  module  to increase or decrease  the
active stages of capacity. The processor module also
controls the EXV driver module, commanding it to open

or close each electronic expansion valve in order to main-

tain approximately 20 F of superheat 

  t h e

cylinders of each of the 

 compressors, Information is

transmitted between the processor module and the relay

module,  EXV  driver 

  a n d   k e y b u a r d   d i s p l a y

module through a 3-wire communications bus.

EXV  (ELECTRONIC EXPANSION 

 DRIVER

MODULE  -- The  EXV  driver module operates  the elec-
tronic expansion valves (based on commands from the
processor) and monitors the status of the 

 pressure

switches and the refrigerant Ioss of charge switches.

If the loss of charge switch opens due 

to 

a low refrig-

erant charge, the EXV driver module detects a zero
voltage condition in the loss of charge switch electrical

circuit and communicates this information to the pro-
cessor module. The processor module immediately shuts
down all compressors in the affected refrigeration circuit.

During operation,  if the  EXV  driver  module detects

zero voltage in the  oil  pressure switch electrical circuit
for 45 consecutive seconds (due to an open oil pressure
switch), it communicates this information to the pro-
cessor module. The processor module 
down 

 compressors in the affected refrigeration 

At start-up, if the oil pressure switch has not closed by the
end of a 

 time period the EXV driver module

senses this and the processor module immediately shuts
down all compressors in the affected refrigeration circuit.

If a shutdown occurs due to loss of 

 or low oil

pressure,  the EXV 

 module communicates this to

the processor module and the processor module locks the
compressors off in the affected refrigeration circuit.

The proper fault code(s) will appear on the display

whenever a safety switch opens.

KEYBOARD AND DISPLAY 

 

 (Fig. 2)

This device consists of a keyboard with   function keys,
5 operative keys, 12 numeric keys (0 to       and an
alphanumeric g-character LCD. Key 

 

 explained

in Table 

 

 

 Module

 

 Control Power ON Light

3 

 RUN/STANDBY Switch

 

 Discharge Pressure Gage 

5 

 Suction 

Pressure Gage Valves

 

 Suction Pressure Gages

7 

 Discharge Pressure Gages

8 

 Compressor ON Lights

9 

 Control Circuit 

Fuses

10

 Alarm Light

qCLR

LOW-VOLTAGE RELAY MODULE -- This module

closes contacts to 

 compressors, solenoid valves

and unloaders. It also senses the condition of the com-

pressor safeties and transmits this information to the
processor module.

q

Status 

 

 diagnostic

codes 

and 

 

information about the machine

Quick Test 

 Checking inputs

and outputs for proper
operation

History 

 This key appears on

the keyboard, but is not used on
the 

 

 E machines

Service 

 Entering specific

unit configuration information

Set Point 

 Entering operating

set points and day/time

information

Schedule 

 Entering occupied/

unoccupied 

schedules 

for unit

operation

Expand Display 

 Displaying 

a

non-abbreviated expansion of

the display

Clear 

 Clearing the screen of

all displays

Up Arrow 

 

 

previous display 

Down Arrow 

 Advancing to

next display position