User Guide

www.emersonclimate.com/owcontrols
ZZ Take-A-Part Thermal Expansion Valve
ZZ Take-A-Part Thermal Expansion Valve
Instruction Sheet
PA-00151
August 2010
11911 Adie Road P.O. Box 411400 St. Louis MO 63141 USA CUSTOMER SERVICE [phone]
ZZ Take-A-Part Thermal Expansion Valves are designed for use
on low temperature applications with evaporator temperature
ranges of – 40°F and below. Take-A-Part ZZ series thermal expan-
sion valves have 3 component parts: power assembly, cage as-
sembly and ange. There are no working parts in the ange. It is
not necessary to break the line connections to service the valve.
SAFETY INSTRUCTIONS
1. WARNING: Before opening any system, make sure the pres-
sure in the system is brought to and remains at atmospheric
pressure. Failure to comply may result in system damage and/
or personal injury.
2. Read Installation Instructions thoroughly. Failure to follow
instructions may result in valve failure, system damage or
personal injury.
3. Do not use on service conditions or uids not specically
cataloged without prior approval of the Emerson Climate
Technologies Flow Controls Division Applications Engineering
Department. Use of thermal expansion valves on applications
not specically cataloged can result in personal injury, valve
failure and/or system damage.
4. Protect against excessive vibration, which may cause the bulb
tube to break, resulting in valve failure.
5. Foreign matter in the thermal expansion valve may cause
diaphragm failure, ooding, or starving. Use of a liquid line
lter-drier is strongly recommended.
6. Valves are factory-set to a specic superheat. If adjustment is
needed, refer to superheat adjustment instructions for proper
procedure. Improper adjustment may result in valve malfunc-
tion and/or system damage.
7. Proper valve sizing is important. An oversized valve may
result in erratic control. An undersized valve may considerably
reduce system capacity.
8. Do not exceed the valve’s max. working pressure of 450 psig-
if exceeded, internal valve pressure could cause damage to
the diaphragm, resulting in valve malfunction.
9. Do not exceed max. working temperature of 250°F - excess
temperatures could cause internal damage, resulting in valve
malfunction.
INSTALLATION INSTRUCTIONS
1. Valves may be installed in any position, but should be located
as close as possible to the distributor or evaporator inlet. Re-
fer to dimensional diagrams for valve roughing-in dimensions.
2. Be sure valve is installed with its ow arrow corresponding to
the ow direction thru the piping.
3. Install line connections to valve. On valves with solder con-
nections, remove the power assembly, cage assembly and
gaskets prior to brazing. Use back-up wrench on all wrench
ats.
4. When reassembling the valve, follow the service instructions.
Tighten cap screws to torque specication.
5. Attach the remote bulb to the suction line as close to the
evaporator as possible. Position the bulb at the 4 or 8 o’clock
position. See gures 1 & 3. Clean the surface of the suction
line where the remote bulb is to be attached, then securely
fasten the bulb. If the remote bulb can be affected by the
surrounding ambient, then the bulb should be insulated with a
material that will not absorb water.
6. Connect one end of the external equalizer line to the valve.
Connect the other end to the suction line, slightly downstream
from the remote bulb location, and positioned so that it cannot
siphon oil from the suction line. See gure 1.
7. Check for leaks, sufcient system refrigerant, and be sure no
ash gas is present.
DISTRIBUTOR
DISTRIBUTOR
Figure 1
Figure 2
POWER
ASSEMBLY
BODY FLANGE
GASKET
CAGE
ASSEMBLY
BODY FLANGE
GASKET
SEAT GASKET
BODY FLANGE
CAPSCREWS
BOTH LUGS MUST
FIT INTO SLOTS
BOTH LUGS ON CAGE
MUST FIT INTO HOLES
IN POWER ASSEMBLY
POWER
ASSEMBLY
CAGE
ASSEMBLY
Figure 3