Emerson Thermo ALCO CONTROLS T-L-ZZ-935 Operating Instructions Manual

G e n e r a l I n f o r m a t i o n :
T-L-ZZ-935 series of Thermo ™ -Expansion Valves are
designed for air conditioning, chillers, rooftops, close
control, A/C transportation, heat pumps, industrial cooling
process, refrigeration and numerous special applications:
Type Application
universal TXV for evaporating temperature down
T
to -45 °C, Bi-flow
TXV for very low evaporating temperature down
ZZ
to -100 °C, Bronze bolts
Liquid injection, Hot gas bypass,
Desuperheating, Economizer, Two stage
L
compressors, Special charges for high
superheat
no superheat control, no internal / external
935
equalizer
In addition to the power assembly (1), an orifice (2) and a
flange with 2 cap screws (3) are required for installation.
There are no working parts in the flange. It is not necessary
to break the line connections to service the valve
(1) (2)
S a f e t y I n s t r u c t i o n s :
• Read operating instructions thoroughly. Failure to
comply can result in device failure, system damage or
personal injury.
• This product is intended for use by qualified personnel
having the appropriate knowledge and skills like trained
according to EN 13313 or a specific training for
flammable refrigerants.
• Flammable refrigerants require special handling and
care due to its flammability. Sufficient ventilation is
required during service of the system.
• Contact with rapidly expanding gases can cause
frostbite and eye damage. Proper protective equipment
(gloves, eye protection, etc.) has to be used.
• Ensure that the system is correctly labelled with applied
refrigerant type and a warning for explosion risk.
• In a severely contaminated system, avoid breathing acid
vapours and avoid contact with skin from contaminated
refrigerant / lubricants. Failure to do so could result in
injury.
• Before opening any system make sure pressure in
system is brought to and remains at atmospheric
pressure.
• Do not release any refrigerant into the atmosphere!
• Do not exceed the specified maximum ratings for
pressure and temperature.
• Do not use any other fluid media without prior approval
of EMERSON. Use of fluids not listed could result in a
change of hazard category of product and consequently
change of conformity assessment requirement for
product in accordance with European Pressure
Equipment Directive 2014/68/EU.
• Ensure that design, installation and operation comply
with European and national standards/regulations.
• For flammable refrigerants only use valves and
accessories approved for it!
I n s t a l l a t i o n : ( F i g . 1 )
1 Power element 7 Body flange gasket
2 Remote bulb 8 Seat gasket
3 External equalizer 9 Body flange
connection
4 Seal Cap 10 Cap screw
5 Body flange gasket 11 Lugged spring Carrier
6 Orifice
• Valves may be installed in any position but should be
located as close as possible to the distributor or
evaporator inlet.
• The expansion valve must be protected against all
contaminants. Install a filter drier and a sight glass in front
of the valve.
Emerson Climate Technologies GmbH
Pascalstrasse 65 I 52076 Aachen I Germany
O P E R A T I N G I N ST RU C T I O N S
Thermo™-Expansion Valve Series
• Minimize vibrations in the piping lines by appropriate
solutions. It may result in bulb tube breake.
• Before brazing remove cap screws, power assembly,
orifice and gaskets..
• Brazing connection - flange: (Fig. 2)
• Perform the brazing joint as per EN 14324.
• Before and after brazing clean tubing and brazing
joints.
• To avoid oxidization, it is advised to purge the system
with an inert gas such as nitrogen while brazing.
• Direction of flow must match with arrow on the flange
(L / ZZ / 935).
• Assemble valve after brazing, according to Fig 1, making
sure that lugs of spring carrier line up with slots inside
power assembly.
• Tighten cap screws:
1) Tighten both cap screws finger tight.
2) Alternately tighten each cap screw until the torque
35 Nm is obtained on each. Over torque may result in
valve body damage.
• Unwind the capillary tube.
WARNING: Do not bend capillary tube directly at
•
the connection to the valve. Permitted: distance N
(10 mm) and radius R (5 mm). (Fig. 3)
• Always locate the remote bulb on the suction line after
the evaporator (T, ZZ and L series), on discharge line
(935). Attach remote bulb to suction line as close to
evaporator outlet as possible (T, ZZ series) in a
horizontal run and fix it, normally at the 4 or 8 o'clock
position. Clean surface of suction line before. (Fig. 4)
(3)
• Connect one end of external equalizer line (OD = 6 mm
= 1/4 inch) to valve. Connect other end to suction line
slightly downstream from remote bulb location and
position it so that it cannot syphon oil from the suction
line (T, ZZ and L series). (Fig. 5)
• Securely fasten the bulb with straps provided. Insulate
bulb with suitable material. The location of bulb on
suction line depends on size of suction line (Fig. 4)
• Check for leaks.
P r e s s u r e T e s t :
After completion of installation, a pressure test must be
carried out as follows:
- according to EN 378 for systems which must comply with
European pressure equipment directive 2014/68/EU.
- to maximum working pressure of system for other
applications.
T i g h t n e s s T e s t :
Conduct a tightness test according to EN 378-2 with
appropriate equipment and method to identify leakages
from joints and products. The allowable leakage rate must
be according system manufacturer's specification.
WARNING:
• Failure to pressure test or tightness test as
described could result in loss of refrigerant, damage
to property and/or personal injury.
• The tests must be conducted by skilled personnel
with due respect regarding the danger related to
pressure.
O p e r a t i o n :
• Check for leaks, sufficient refrigerant charge and be sure
no flash gas is present before attempting to check valve
operation.
P r o p e r o p e r a t i o n o f c h a r g e s :
The maximum bulb temperature is limited to:
Valve Code
SWxx / MWxx / NWxx /
ZWxx / BWxx
T
SW / MW / NW / ZW / BW
ZZ BGxx / SWxx / BWxx
L CL / GL / UL
935 UL / KL / YL / JL / LL
WARNING:
Gas charged valves features MOP function and only
operate properly if the temperature at the bulb is below
the temperature at valve head / capillary tube (see Fig.
5). If the valve head becomes colder than the bulb,
malfunction of the expansion valve occurs (i.e. erratic
www.climate.emerson.com/en-gb
T-L-ZZ-935
Max. bulb
Charge
temp.
MOP +175°C
liquid +85°C
MOP +175°C
+175°C
+175°C
OI_T-L-ZZ-935_A1_A2L_EN_DE_FR_ES_IT_Rev07_862157.docx
low pressure or excessive superheat).
F a c t o r y s e t t i n g s :
The table below provides the factory setting position of
superheat adjusting stem and shows the number of turns
(360°) clockwise when adjusting
counterclockwise
Valve type Orifice type
TCLE / LCLE X22444-B...
TJRE / LJRE X11873-B...
TERE / LERE X9117-B...
TIRE / LIRE X9166-B...
THRE X9144-B...
ZZ, 935 X10-B...
935 X10-C...
T-series - with non-standard refrigerants:
In Tab. 1 listed refrigerants can be used with standard
charges when factory setting is readjusted for optimum
superheat level. The readjustment depends to operating
evaporating temperature as follows:
NOTE: Change of static superheat will shift MOP point in
reverse direction.
Fig. 6
There are max. 32 turns
on the adjustment stem
(from left stop). There is
no right stop, any further
turning will damage the
valve.
NOTE: + = Clockwise rotation
- = Counterclockwise rotation
S u p e r h e a t A d j u s t m e n t :
If the superheat must be adjusted for the application
proceeds as follows:
1. Remove seal cap from side of valve (1).
2. Turn the adjustment screw clockwise to increase
superheat and counterclockwise to decrease superheat.
Allen key X 99999 (2) Changes in superheat (K) per stem
turn depending on evaporating temperature and
refrigerant as shown in Tab. 2.
As much as 20 minutes are required for the system to
stabilize after the adjustment is made.
3. Determine superheat "sh" according to Fig. 8.
4. If refrigerant escapes use Allen key X99999 (3) to fix
spindle gasket.
5. Replace and tighten seal cap (hand tight < 15 Nm).
S e r v i c e / M a i n t e n a n c e :
• Whenever a valve is opened, requires replacing all
gaskets
• Before any debrazing ensure that the flammable
refrigerant is pumped out of the system and the room
around the system is well vented so no refrigerant left.
• According to EN 378-4 during
maintenance, tightness tests shall be carried out at the
relevant part of the refrigerating system. This shall apply
where appropriate following any repair.
T e c h n i c a l D a t a :
Max. allowable pressure PS
XB Power Element 46 bar
XC Power Element 31 bar
Test pressure PT
XB Power Element 50.6 bar
XC Power Element 34.1 bar
Medium Temperature range TS
T / L/ 935 -45...+75 °C
ZZ -100...+75 °C
Fluid group I + II
Hazard category SEP (PED 14/68/EU)
Standards RoHS
Marking
Dimensions See Technical
Information document
EN
stem fully open
Number
of turns
+16
+20
+24
+24
+24
+20
+10
WARNING:
each periodic
(not required)
Date: 25.05.2023