Just Better SH-35N User Manual

SH-35N

(°F)

and SH-36N

SUPERHEAT and SUBCOOLING GAUGE
OPERATING INSTRUCTIONS

Only a properly charged unit will provide the owner
with the design SEER for maximum energy efficiency.

(°C)

SUPERHEAT

SUPERHEAT, TEMPERATURE,
SUBCOOLING AND PRESSURE

PUSH once to toggle between displays
PUSH 2 times to recall High, Low & Average

Hold down to clear memory.

ON/OFF

PUSH once to “Turn On”
Display shows LAST refrigerant used.
HOLD down to "Turn Off"
PUSH 2 times to select 1 hour or 24 hour auto-off mode

REFRIGERANT SELECTION

PRESS once at any time to display current refrigerant.
Continue pressing to scroll the refrigerant list.
(See list of refrigerants on page 4.)

Not intended for use on hazardous or corrosive fluids

GAUGE SPECIFICATIONS:
Pressure display range: 29 InHg to 600 psig (-98kPa to 4134 kPa)

(+/- 1 PSI to 200 psi, 0.5% to 600 psi)
Temperature display range: -40°F to 200°F (-40°C to 93°C)
Operating temperature: -10°F to 120°F (-12°C to 49°C)

(+/- 1°F * 32°F/120°F, +/- 1.5°F * -10°F/32°F)
Maximum overpressure: 800 psig (5512 kPa)
Battery life and type: 100 hours/ 9vAlkaline battery
Auto-shutoff time: 60 minutes (extended 60 minutes by upper button action)
Refrigerant data source: NIST REFRPRO software and manufacturers data

TEMPERATURE

SENSOR

2

1

EXTENDING

AUTO-SHUTOFF TIME

Extend time by 60 minutes by
pressing upper button.

Uses one 9v Alkaline battery

(not included)

APPLICATION TIPS:

Allow the manifold to Zero at Turn-On:

The manifold displays will zero (CAL) each time the
manifold is turned on open to atmosphere. Zeroing the gauge
compensates the Pressure display for changes in (1) Altitude
and (2) Barometric pressure.

Pressure Calibration

Don’t be alarmed if your manifold gauge does not agree
with your mechanical gauges. The digital manifold is
calibrated with a very accurate pressure and is not affected
by vibration, motion or position.

Extending On-Time

The digital manifold will turn off automatically after 60
minutes to save battery life.

If any button is touched the digital manifold will stay on for
another 60 minutes.

Over/Under-Range Indicator

Pressures or temperatures below or above the rated

ranges will cause a “1” to be displayed.

Low Battery Indicator

Low batteries will be indicated by a blinking display.

Batteries For Low Temperature Applications

Using the gauge in a low temperature conditions will
shorten battery life. Change to the 9 volt Lithium battery
(Radio Shack 23-665) to solve this problem.

OBTAINING TARGET SUPERHEAT VALUE

A

WET BULB TEMPERATURE OF EVAPORATOR ENTERING AIR

1. Open to atmosphere. Gauge will automatically calibrate to
“Zero” for altitude and atmospheric pressure changes.

2. Wet the sock with water and slip on to sensor. Mount on the
building return air grill or air return line of blower to measure the
Indoor Wet Bulb temperature.

3. Turn on the furnace fan to create a flow of air across the wet sock
for 5 minutes. The final number will be your Wet Bulb Temperature.

Sample Superheat Chart

(Located on condensing unit- for

older models contact manufacturer.)

OUTDOOR

TEMP °F

50

55

60

65

70

75

80

85

90

95

100

105

110

9

7

EVAPORATOR ENTERING AIR- F° Wet Bulb Temperature

52

12

10

56

54

14

12

6

10

6

17

15

13

10

58

20

18

16

13

6

9

5

60

23

21

19

16

12

8

12.5

62 64

26.9

24.3

21.9

19.6

16.2

29

27

24

21

18

15

66

32

30

27

24

21

18

1

15

13

9

10

6

8

5

68

35

33

30

27

24

21

19

16

14

12

WET
SOCK
IN AIR
FLOW

SUPERHEAT

70

72 74

37

40

38

35

36

33

33

30

31

28

25

28

26

22

24

20

22

18

20

15

9

6

13

11

17

15

42

40

38

36

34

31

30

27

25

23

22

20

TEMPERATURE

SENSOR

76

45

43

41

39

37

35

33

31

29

27

26

25

115

SUPERHEAT

TEMPERATURE
SENSOR

8

14

SUPERHEAT

TEMPERATURE

SENSOR

18

23

BC

OUTDOOR TEMPERATURE

1. Remove sock and measure the
Outdoor Air Temperature.

JB INDUSTRIES
AURORA, IL 60507 USA
Technical service:
E-Mail: [e-mail]
Web Site: www.jbind.com

800-323-0811

TARGET
SUPERHEAT VALUE

QC RESTRICTOR
FITTING

A34000
1/4” SAE TEE
W/ SWIVEL COUPLER

REFRIGERANT
TANK

1. Find the outdoor temperature and evaporator entering air wet­bulb temperature on chart. The target superheat value is at the
intersection of the two.

If you have to do repairs, recheck your temperatures.

2. Make your connections and toggle the gauge to show SUPERHEAT.
For system refrigerants other than R22, scroll to select Refrigerant.

3. Very slowly add or refrigerant to lower superheat or remove
refrigerant to raise superheat until the gauge displays the target
value.

TO

LIQUID LINE

SERVICE VALVE

TO SUCTION
SERVICE VALVE

TEMPERATURE

SENSOR

LIQUID LINE

SUCTION LINE