Carrier HS070-160 manual Features - The 30HR,HS control panel is shown in Fig

Features - The 30HR,HS 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 entering t h e cylinders of each of the Iead compressors, Information is transmitted between the processor module and the relay module, EXV driver moduIe and keybuard display module through a 3-wire communications bus.

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EXV (ELECTRONIC EXPANSION VALVE) DRIVER MODULE -- The EXV driver module operates the elec- tronic expansion valves (based on commands from the processor) and monitors the status of the oi1 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 immediatelvshuts down ali compressors in the affected refrigeration circuit. At start-up, if the oil pressure switch has not closed by the end of a 60-second 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 cftarse or low oil pressure, the EXV driver 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 MODKLE - (Fig. 2) This device consists of a keyboard with Cr function keys, 5 operative keys, 12 numeric keys (0 to 9, 11 -) and an alphanumeric g-character LCD. Key usage ii; explained in Table 1.

Table 1 - Keyboard and Display Madule -

Key Usage

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IO

0

I - Keyboard/Display Module

2 - Control Power ON Light

3 - RUN/STANDBY Switch

4 - Discharge Pressure Gage Valves

5 - Suction Pressure Gage Valves

6 - Suction Pressure Gages

7 - Discharge Pressure Gages

8 - Compressor ON Lights

9- Control Circuit Fuses

10 - Alarm Light

Fig. 1 - Control Panel

LOW-VOLTAGE RELAY MODULE -- This module closes contacts to energize compressors, solenoid valves and unloaders. It also senses the condition of the com- pressor safeties and transmits this information to the processor module.

FUNCTION

K E Y S

SCHD 0

OPERATIVE

K E Y S

EXPN

El

qCLR qt

4 El

ENTR 0

LOSE

Status - Displayjng diagnostic

codes and current operating 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 30HR,HS Modei 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

USE

Expand Display - Displaying a non-abbreviated expansion of the display

Clear - Clearing the screen of all displays

Up Arrow - Rtjturnipg to

previous display posItIon

Down Arrow - Advancing to next display position

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