Mastercool 69788-A R134a RECOVERY_RECYCLE_RECHARGE User Manual

Page 9

CONTROLS AND CONTROL SYSTEM

Refer to Figure 9.
A1) High pressure gauge

A2) Low pressure gauge

A3) Keyboard

A4) LCD: 4 lines, 20 characters

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FIG. 9

FUNCTION SELECTOR KEYBOARD

STOP:

Press to interrupt the operation being performed -- recovery - oil discharge - vacuum/oil charging - charging. Press START to resume

operation from the point of interruption. Pressing STOP during an alarm state, error state, or end-of-operation state silences the audible
alarm.
RESET: Press to interrupt the vacuum and the charging operation. The procedure will be restarted from the beginning.
ENTER: Press to conﬁrm the procedure or operation ﬂashing on the LCD.
↓:

Press to move downward from one procedure or operation to another within a menu.

↑:

Press to move upward from one procedure or operation to another within a menu.

START: Press to launch the procedure or operation shown on the display.

NOTE: “Tank” and “Bottle” are both used to describe a refrigerant container.

ALARMS

HIGH PRESSURE ALARM:

Beeper and LCD advise when the pressure of the ﬂuid in the circuit reaches 290 psi (20 bar). The recovery

operation is automatically interrupted. See page 19, Purging Non-Condensable Gases.

FULL TANK ALARM:

Beeper and LCD advises when the tank is ﬁlled to more than 80% of maximum capacity; that is,

24 lbs (10.8 kg.), the RECOVERY operation is automatically interrupted. To cancel this alarm, charge one or

more A/C systems before recovering any more refrigerant or, using a scale and a D.O.T. tank, charge enough

refrigerant into the D.O.T. tank so that the refrigerant available will be approximately 12 to 15 lbs. This

refrigerant can be reclaimed later should 69788 need to be re-ﬁlled again with refrigerant. (See Empty Tank

Alarm)

NOTE: Do not attempt to charge a new refrigerant tank (blue tank with a single port valve). These tanks are

not D.O.T. approved for reﬁlling and only have a check valve in them that allows refrigerant to leave the tank.

Since these tanks have a check valve and DO NOT have pressure safety devices on them they cannot be

reﬁlled by 69788.

NOTE: Never transfer refrigerants to a cylinder or tank unless it is D.O.T. approved for reﬁlling. D.O.T. approval

is indicated by the designation “DOT 4BA” or “DOT 4BW” stamped on a tank’s collar (handle.) If a refrigerant

tank is overﬁlled, it may explode! Failure to abide by these warnings may cause personal injury or death.

EMPTY TANK ALARM:

Beeper and the LCD advise when the quantity of refrigerant ﬂuid contained in the tank is too low. At this time

it will be necessary to bottle ﬁll 69788 to approximately 12 to 15 lbs of refrigerant in order for the alarm to

clear.

SERVICE ALARM:

Service Alarm: The ﬁrst service alarm; when the total recovered amount of refrigerant reaches 114 lbs, a

beeper will sound and the LCD will display SERVICE ALARM. To clear the alarm, press STOP.

After the ﬁrst alarm is cleared, ﬁlters should be purchased to have ready when 69788 requires that the ﬁlters

be replaced.

The second service alarm; when the total recovered amount of refrigerant reaches 132 lbs, a

beeper will sound and the LCD will display ENTER FILTER CODE. There will also be 10 dots along the bottom