Robinair 14830A Thermistor Vacuum Gauge Manuel d'utilisateur télécharger pdf (Page 2)

Model 14830A

Thermistor Vacuum Gauge

Description

The 14830A Thermistor Vacuum

Gauge has been designed to use with

high vacuum pumps to accurately

measure vacuum level during evacuation

of A/C and refrigeration systems. This

unit indicates precisely when the system is

free of air and water, eliminating guess-

work and saving valuable service time. It

can also be used to check for leaks without

precharging; if the system holds a vacuum, it

is leak-free.

Battery and A/C powered and self-contained in a durable carrying

case, the 14830A is easy to use and transport. The sensor is built into

the unit and connected to the system through a fitting on the front panel.

A 24” Premium Refrigerant Charging Hose is included for connecting

the thermistor and the system. The hose is stored in a recessed area of

the case.

Power Supply

The 14830A can be used with an A/C power adapter or 4 “D” cell

batteries. See below for A/C adapter requirements.

*A/C adapter output: 6VDC 200mA, + outer ring and

- center pin. Robinair Part No. 18712, 110V.

LCD Range and Tolerance

The 14830A uses the micron scale, the most accurate indicator of

vacuum, measuring from atmosphere to 50 microns. Micron readings

are shown on a custom LCD divided into 10 segments which are shown

as “bars” on the LCD. These segments are:

25,000 microns................. ±5,000 microns

2,500 microns...................... ±500 microns

1,300 microns...................... ±100 microns

1,000 microns...................... ±100 microns

700 microns......................... ±100 microns

400 microns........................... ±50 microns

275 microns........................... ±25 microns

200 microns........................... ±25 microns

100 microns........................... ±10 microns

50 microns...............................±5 microns

Operating Instructions

1. Install four “D” batteries into the holder by removing the screw on

the bottom of the battery plate holder. Lift out the plate and install the

batteries into the holder following polarity indicators. Replace the

battery plate into the unit panel by sliding in the top edge first and

secure with the screw.

2. Connect the 24” hose to the flare fitting marked “Vacuum” on the front

panel.

3. Connect the other end of the hose to the system.

CAUTION: Before attaching the hose to the system, depressurize the

system. Damage to the sensor may occur if the connection is made

while the system is pressurized.

4. Turn the power ON and allow one minute for the unit to warm up.

5. Check the LCD window. If all 10 “bars” appear on the screen the

system is above 25,000 microns (1” Hg vacuum).

6. Begin evacuating according to the system manufacturer’s specifica-

tions. As the system is pumped down, the “bars” on the LCD will go out

one by one. At the point when the bar goes out, the system is at the

vacuum level shown next to that bar.

CAUTION: When you finish the evacuation cycle and during equip-

ment shut-down, close any valve between the gauge and the pump

or open the connection at the flare fitting on the instrument panel.

Maintenance

1. The word BAT will appear on the display when the batteries need

replaced. Replace the batteries as soon as possible.

2. If the sensor aquires an oil film, flush the interior with rubbing alcohol

and allow to air dry.

3. If the unit is not going to be used for an extended period of time,

remove the batteries to eliminate possible battery damage due to

leakage.

4. The panel may be cleaned with a damp cloth. DO NOT use harsh

solvents and/or chemicals to clean.

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Thermistor Vacuum 1
Model 14830A 2

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Robinair 14830A Thermistor Vacuum Gauge Manuel d'utilisateur Page 2

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