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Thermal Expansion Valves

Emerson Climate Technologies

To help you match the correct charge to your specic

application, see the TXV Charge Code Selector on the

next page. Also provided here are some typical exam-

ples of applications by refrigerant charge.

Liquid Charge – L

Ice makers, pilots, liquid injection valves

Liquid Cross-Charges – C, Z

Commercial refrigeration (low & medium temp.), ice

makers, transport refrigeration and air conditioning

Gas Charge – G

Air conditioning (including mobile), water chillers

Gas Cross-Charge – CA, AA

Heat pumps and air conditioning

Gas Cross-Charge – HAA

Heat pumps and air conditioning

W(MOP)

Maximum Operating Pressure

EMERSON EMERSON

ASHRAE TRADE OR CODE CODE

REF. NO. CHEMICAL NAME COLOR LETTER

R-12 Dichlorodiuoromethane WHITE F

R-22 Chlorodiuoromethane GREEN H

R-502 22/115 PURPLE R

R-134a Tetrauoroethane LIGHT BLUE M

R-404A 125/134a/143A ORANGE S

R-401A 22/152A/124 CORAL X

R-507A 125/143A TEAL P

R-410A 32/125 ROSE Z

ARI Standard 750-2007 recommends the following color coding of thermostatic

expansion valves: R-12 White; R-22 Green; R-502 Orchid; R-40 Red;

R-500 Orange. Uncommon refrigerants with no designated color should use Blue.

Refrigerant Code Names

Emerson “T” Series TXVs [except “W”-(MOP),

G-(MOP) or GS-(MOP) gas charged types] may be

installed in any location in the system. The gas charged

type must always be installed so that the power assem-

bly will be warmer than the remote bulb. The remote

bulb tubing must not be allowed to touch a surface cold-

er than the remote bulb location. If the power assembly

or remote bulb tubing becomes colder than remote bulb,

the vapor charge will condense at the coldest point and

remote bulb will lose control.

For exact TXV selection (i.e., refrigerant tonnage,

connections, equalizer style, cap tube length, adjust-

ment and proper application, air conditioning, commer-

cial, low temperature) refer to Emerson catalog.

Emerson MOP

The Emerson “W” charge can be supplied with the

MOP feature if needed for system protection. This need

rarely occurs in modern day refrigeration except such

conditions as immediately after defrost or on gasoline

driven compressors such as truck refrigeration.

For special applications, other charges may be used

from time to time. For help in selecting a charge with

Motor Overload Protection (if required by compressor

manufacturer) see the table below and the TXV Charge

Selector on page 13.

NOTE: MOP not available with Rapid Response Bulb.

APPLICATION R134a R22 R404A/R507A

COMMERCIAL MW35 HW65 *W65

LOW TEMP. MW15 HW35 *W45

* Add refrigerAnt code As follows: s = r404A, P = r507A

Superheat adjustment of “W–MOP” charged TXVs

will change the MOP point. An increase in superheat

setting will lower the MOP point and a decrease in su-

perheat setting will raise the MOP.

THERMOSTATIC CHARGE

The table above refers to the maximum dehydration tempera-

tures when the bulb and TXV body are subjected to the same

temperature. On A, L, C, Z, and X charges, 250°F maximum

TXV body temperature is permissible (if the bulb tempera-

ture) does not exceed those shown in the table.

NOTE: Emerson charges “A”, “C” and “Z” are liquid cross-

charges.

REFRIGERANT L C Z G WMOP/CA X

R134a 195 190 250 250 250 N/A

R22 160 160 185 250 250 N/A

R404A/R507A 150 150 170 250 250 N/A

R717 N/A N/A 150 N/A N/A 200

TABLE 1 – Maximum Dehydration Temperature (in °F)

1 2 ... 11 12 13 14 15 16 17 18 19 20 21 ... 71 72

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