Just Better SH-36N Obtaining Target Superheat Value - Manual (Page 2)

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
Uses one 9v Alkaline battery
(not included)
EXTENDING
AUTO-SHUTOFF TIME
Extend time by 60 minutes by
pressing upper button.
Push lower button 2 times to
select 1 hour or 24 hours.
SUPERHEAT
REFRIGERANT KE Y
(R410A Included)
TEMPERA TURE
SENSO R
2
1
R404A
HP62
PSI/F
MANUFACTURER’S DESIGNATION
“R” NUMBER
UNITS (F or C)
Only a properly charged unit will provide the owner
with the design SEER for maximum energy efficiency.
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.)
Wait 1.5 seconds, then continue pressing to reverse
scroll direction.
APPLICATION TIPS:
Allow the manifold to Zero at Turn-On:
The manifold displays will zero (CAL) each time the
manifold is turned on without pressure . 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.
REFRIGERANT KEY PLUG-IN
See page 4 for other
refrigerant keys available.
Metric and English keys are
not interchangeable.
SH-35N
(°F)
and SH-36N
(°C)
SUPERHEAT and SUBCOOLING GAUGE
OPERATING INSTRUCTIONS
REFRIGERATION APPLICATIONS
SETTING FOR THERMOSTAT
CONTROLLED CASES AND
COOLERS
Without plug-ins, turn on the gauge
and zero the display by holding
the lower button. Plug in the
Temperature Sensor only and toggle
to “Temperature.”
SETTING FOR THERMOSTAT
CONTROLLED CASES AND
COOLERS
Without plug-ins, turn on the gauge
and zero the display by holding the
lower button. Attempts to zero the
gauge with pressure applied will
result in (Err) display.
A/C & REFRIGERATION APPLICATIONS
Contact your TXV manufacturer for the exact superheat adjust rate.
0 5 10 15 20 25
20
18
16
14
12
10
8
6
4
Superheat
ϒF
Time in Minutes
Expansion Valve Superheat
SH-35N Average Superheat
Hussmann RHF A 4 Door FF Case
1 Ton Lo w Temp. TXV
-2 F Case Temperature
40% Heater Load
SET SUPERHEAT FOR
“HUNTING” TXV VALUES
In refrigeration and air
conditioning systems, the
expansion valve often
operates to produce an
evaporator superheat
which constantly swings up
and down in value, called
“hunting.” The SH-35N
provides the “Average”
superheat value for TXV
valve adjustment.
CHECKING TXV SETTING
The objectives of the TXV superheat setting is to prevent
liquid refrigerant floodback to the compresor and to
optimize system operation by the use of a selected setting.
The two temperature method of measuring superheat
is not recommended because it can produce a wrong
superheat measurement, due to the effect of temperature
glide of the blended refrigerants and variations in
evaporator pressure drop.
NEW RESIDENTIAL A/C SYSTEMS
For new installations of residential A/C systems, the pre-
charge will not provide an accurate amount of refrigerant
charge because of the variation in the length of liquid and
suction line connecting to the “A” coil.
RETROFITTING SYSTEMS
Retrofitting systems to a new refrigerant can change the
TXV superheat setting. The superheat setting should
be checked before and after retrofitting to be sure the
superheat is right for the equipment.
REPLACEMENT ITEMS
PART NO. DESCRIPTION
A34000 1/4" QC x 1/4" Access Branch Tee
SH-54
6' Temperature Sensor
SH-55 Plastic Carrying Case
SH-56 Socks (5)
ACCESSORIES
SH-51 28' Temperature Sensor Extension
KEY REFRIGERANT LIST “A”
R11
R12
R13
R22
R23
R134A
R290
R401A
R401B
R402A
R402B
R403B
R404A
R406A
R407A
R408A
R409A
R410A
R411C
R413A
R414B
R416A
R417A
R422A
R500
R502
R507
R508B
RB276
SUPERHEAT
JB INDUSTRIES
630.851.9444
Printed in USA
Part No. 10737-308 © 2006 J/B Industries Inc.
Technical service: 800-323-0811
E-Mail:[email protected]
Web Site:www.jbind.com
Fahrenheit and Celsius Keys are not interchangeable
SUPERHEAT
TEMPERA TURE
SENSOR
TEMP PSI
R407B
R407C
R422B