User Guide
Connection t
ype
1)
The 4-wire connection should always be given preference!
S
NA
P
MED
I
F
Wire cross-section [mm
2
]
1.5 2.5 4.0
2)
Product number [VA] [W] [A] max. cable length L [m]
CDV..MVL661..-.. 22 12 1.6…4 A 65 110 160
4-w
ire connection
3-wire connection
CDV..MVL661..-.. 22 12 1.6…4 A 20 35 50
S
NA
= nominal apparent power for selecting the transformer
P
med
= typical power consumption
I
F
= required slow fuse
L = max. cable length; with 4-wire connections, the max. permissible length of the separate 1.5 mm
2
copper positioning signal wire is 200 m
1)
All information at AC 24 V
2)
With 4 mm
2
electrical wiring reduce wiring cross-section for connection inside valve to 2.5 mm
2
.
Engineering notes
Depending on the application, it may be necessary to observe additional installation
instructions and fit appropriate safety devices (e.g. pressostats, full motor protection,
etc.).
War
ning
In order not to damage the seal inside the
valve insert, the plant must be vented on the
low-pressure side after the pressure test has been made (valve port AB), or the valve
must be fully open during the pressure test and during venting (power supply
connected and positioning signal at maximum or forced opening by G → ZC).
E
xpansion application To prevent formation of flas
h gas on expansion applications, the velocity of the
refrigerant in the fluid pipe may not exceed 1 m/s. To assure this, the diameter of the
fluid pipe must be greater than the nominal size of the valve, using reducing pieces for
making the connections to the valve.
1 = evaporator
2 = compressor
3 = condenser
4 = expansion valves
Engineering n
otes
a)
The differential pressure over reduction must be less than half the differential
pressure Δp
FL
.
b) The inlet path betweeen diameter reduction and expansion valve inlet
Must be straight for at least 600 mm
May not contain any valves
A filter / dryer must be mounted upstream of the expansion valve.
It is not approved for use with ammonia (NH3, R717).
II 3G
The valve is s
upplied complete with mounting instructions.
5/12
Building Technologies Refrigerant Valves PS45 CE2Q4714en
HVAC Products 29.02.2012