ALLTEMP 04-SH55 - Digital Superheat & Sub-Cooling Gauges - Replacement plastic carrying case

Digital Superheat & Sub-Cooling Gauges

Multi-Function A/C & Refrigeration Gauge

Instant superheat, sub-cooling, temperature and pressure readings at the touch of a button. Comes with built in R22 table, R410A refrigerant key,

04-A34000 quick coupler access tee, 6' dry/ wet bulb temperature sensor and socks. The 04-SH35N features selectable 1 or 24 hour memory. The high, low and average values are saved in all four modes. Only by accurately determining the superheat or sub-cooling value, can a system's critical charge be obtained to reach maximum performance.

The Superheat method of refrigerant charging is used with evaporators equipped with piston type expansion devices or capillary tube (non TXV). The subcooling method if primarily used for residential and commercial air conditioning systems which have a TXV expansion device but do not have a liquid refrigerant receiver.

Pulsation proof and accurate at any elevation from sea level to 16,000' without any adjustment.

Features

• 1 and 24 hour memory!

• Saves high, low and average values.

• Simple two button operation.

• Protected sealed touch buttons.

• R22 built-In, R410A key included.

• NIST traceable.

• Retracting hanging hook.

• Carrying case.

• Keys for all standard refrigerants.

• Low battery indicator.

• Auto shut-Off after 60 min inactivity.

• 100 hours on (1) 9V (not included).

- For low temperature applications use lithium battery.

• 800 psi (5512 kPa) maximum over pressure.

A/C & Refrigeration Applications

Checking TXV Setting

• The objectives of the TXV superheat setting is to prevent liquid refrigerant from flooding back to the compressor and to optimize system operation by the use of a selected setting.

• The 04-SH35N measures true superheat. The two temperature method of measuring superheat is not recommended. It can produce a wrong superheat measurement due to the effect of temperature glide of the blended refrigerants and variations in evaporator pressure drop. Contact your TXV manufacturer for the exact superheat adjust rate.

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.

Refrigeration Applications

Set Superheat For Hunting TXV Valves

• 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 04-SH35N provides the "average" superheat value to use for TXV valve adjustment.

Setting For Pressure Controlled Cases & Coolers

• Obtain accurate high, low and average evaporator pressure under EPR control. Accurately test for the cut-in/ cut-out setting of the system's low pressure control.

Setting For Thermostat Controlled Cases & Coolers

• Accurate verification of high, low and average temperatures over a period of time.