Maintenance, A/c basics, Limited warranty – Fieldpiece SVG3 - Digital Micron Vacuum Gauge User Manual

Page 2: For service, More great tools from fieldpiece, Battery replacement, Cleaning the sensor, Replacement parts, Battery cover screw

Maintenance

Clean the exterior with a dry cloth.

Do not use liquid.

Battery Replacement

Power off SVG3. Unscrew battery

cover, and replace the 4 AAA batteries.

Battery Cover Screw

Cleaning the Sensor

1. Turn off your SVG3.

2. Remove the core valve depressor and rubber gasket.

A small pair of needle nose plyers can easily pull

out the depressor and the gasket at the same time.

Be careful to not puncture or tear the gasket.

3. Fill the cavity halfway with isopropyl (rubbing)

alcohol.

4. Use your index finger to cover female flare fitting

and gently swirl and shake the alcohol within the

cavity for about 15 to 30 seconds.

5. Pour out the alcohol and let the vacuum sensor dry

with the flare fitting facing down.

6. Re-insert core depressor and rubber gasket. Screw in

T-fitting (included) to lock in the rubber gasket.

Note: Do not use an object such as a cotton swab to

clean the sensor. This may damage the sensor.

A/C Basics

The Evaporator, Condenser, Restric-

tor (Throttling valve) and Compressor

are the four basic components of an

air conditioner. Following one pound

of refrigerant through the system

shows the function of each compo-

nent.

Subcooled liquid refrigerant at high

pressure enters the restrictor and is

throttled to saturated refrigerant at a

lower pressure. The restrictor can be

either a fixed or TXV/EXV type. The

fixed type must be charged to a target

superheat that varies with indoor and

outdoor conditions. TXV/EXV systems

must be charged to subcooling.

The evaporator capacity varies

with the indoor heat load on a fixed

restrictor. The TXV/EXV regulates the

size of the restriction to maintain a

constant superheat. This essentially

adjusts the capacity of the evaporator

responding to the indoor heat load.

After the restrictor, refrigerant

enters the evaporator at a low tem-

perature and pressure, and boils

(evaporates) into a gas by absorbing

heat from the indoor air. The refriger-

ant stays at the same temperature

and pressure until all the refrigerant

evaporates into a gas. After the refrig-

erant becomes a gas, it will continue to

absorb heat and become superheated

at which point its temperature will

change. The Superheat measurement

is the best indication of refrigerant

charge level in a fixed restrictor sys-

tem. A TXV/EXV system will keep the

superheat constant. There must be

superheat present to ensure liquid

does not flood the compressor.

Superheat measurements are

taken on the suction line between

the evaporator and compressor.

The compressor takes this low

temperature, low pressure, slightly su-

perheated refrigerant and compresses

it to a much higher temperature and

pressure.

The highly superheated gas enters

the condenser and rejects heat into

the outside air. The refrigerant con-

denses back into a liquid. Once all of

Limited Warranty

This meter is warranted against

defects in material or workmanship

for one year from date of purchase.

Fieldpiece will replace or repair the

defective unit, at its option, subject

to verification of the defect.

This warranty does not apply to

defects resulting from abuse, ne-

glect, accident, unauthorized repair,

alteration, or unreasonable use of the

instrument.

Any implied warranties arising

from the sale of a Fieldpiece product,

including but not limited to implied

warranties of merchantability and

fitness for a particular purpose, are

limited to the above. Fieldpiece shall

not be liable for loss of use of the

instrument or other incidental or

consequential damages, expenses, or

economic loss, or for any claim of such

damage, expenses, or economic loss.

State laws vary. The above limita-

tions or exclusions may not apply to

you.

For Service

In the USA, call Fieldpiece Instru-

ments for one-price-fix-all out of war-

ranty service pricing. Send check or

money order for the amount quoted.

Send the meter freight prepaid to

Fieldpiece Instruments. Send proof

of date and location of purchase for

in-warranty service. The meter will be

repaired or replaced, at the option of

Fieldpiece, and returned via least cost

transportation.

For international customers, war-

ranty for products purchased outside

of the U.S. should be handled through

local distributors.

www.fieldpiece.com

More Great Tools

from Fieldpiece

Replacement Parts

Rubber gasket and Schrader de-

pressor are user-replaceable. Worn

out gaskets and depressors can lead

to a bad seal. Over-tightening of the

SVG3 female flare fitting may cause

the rubber gasket to wear more

quickly. Replace if the rubber gasket

becomes worn or the Shrader depres-

sor is not in the center. Both these

parts can easily be found at your local

HVACR distributor.

1. Remove both the Schrader depressor and rubber

gasket from the flare fitting. Dispose of worn

rubber gasket. A small pair of needle nose plyers

can easily pull out the depressor and the gasket at

the same time. Be careful not damage the Schrader

depressor.

2. Re-insert and center the Schraeder depressor into

the flare fitting. If the depressor does not stay

centered, replace with a new one.

3. Drop in and position of the new rubber gasket

(standard 1/4" rubber gasket replacement part)

around the Schraeder depressor. Push in with your

finger.

4. Lock O-ring into place by screwing in the included

brass T-fitting. Do not over-tighten.

EVAPORATOR

CONDENSER

THROTTLE

VALVE

COMPRESSOR

REFRIGERANT

FLOW

h P

ress

ure Side

Low Press

ure

Sid

RETURN AIR

SUPPLY AIR

OUTDOOR AIR

HOT AIR

the gas is condensed into a liquid,

additional removal of heat causes

a temperature drop that is known

as subcooling. TXV/EXV systems are

charged to subcooling since super-

heat is controlled by the throttle

valve. Subcooling measurements are

taken on the liquid line between the

condenser and TXV/EXV. Finally, the

subcooled liquid enters the restrictor

and the cycle starts again.

Wireless 4-Port Manifold

Model SMAN4

PRESS FOR 1 SEC

OND

AUTO-OF

SRS2

Wireless

Refrigerant

Scale

ZERO

SYNC

UNITS

ON/OFF

PRESS FO

1 SECOND

Wireless Refrigerant Scale

Model SRS2C

SC57

AUTO OFF

TRUE RMS

CAT III

600V

TEMP

K-TYPE

30V

MAX

SC57

WIRELESS ENABLED

SEL

HOLD

MAX

MIN

SYNC

MAX

MIN

Wireless Clamp Meter

Model SC57

Heated Diode Refrigerant Leak Dectector

Model SRL8

SENSITIVITY

AUTO-ZERO

LOW-BATT

SRL8

ON/OFF

MUTE

ZERO

L/M/H

Heated Diode

Refrigerant

Leak Detector

PRESS FOR

1 SECOND

BATTERY

CHECK

Dual In-Duct Psychrometer

Model SDP2