LEAFLET No P80955
ISSUE 2
Page 4
Email: [email protected]
Website: www.horstmann.co.uk
The Z322XL mid-position valve has been designed to control
the water circulation in fully pumped systems, which employs
a single pump for both Hot water and Central heating circuits,
by diverting the flow to either circuit or both simultaneously
using a single valve.
Horstmann Controls Limited
Bristol
BS4 1UP
t:0117 9788 773 - f:0117 9788 701
APPLICATION
Motor supply voltage: 230V AC, 50Hz
Power consumption: <6W
Lead supplied: 1 meter 4 core cable. Industry standard colours used
No earth connection required as unit is double insulated
Operating flow temperature: -5
o
C to 88
o
C
Switch rating: 3Amps
Maximum ambient temperature:
50
o
C
SPECIFICATION
Maximum static pressure: 8.6 Bar
Maximum differential pressure: 0.5 Bar
Pipe fitting size: 22mm compression
Actuator: Maximum time to power
open - 20 seconds
Maximum time to spring
close - 10 seconds
Override lever: For manual operating to
mid-position for system draining or filling.
During normal operation, the lever must be
in the auto position.
(See diagram opposite).
To check whether the valve is operating correctly, carry out the following checks after the system is
filled and vented. Ensure that the override lever is back in the Auto position and the insert guide is
removed.
HOT WATER ONLY.
Set the room thermostat to minimum or turn the CH off at the programmer.
Set the cylinder thermostat to maximum and turn the HW on at the programmer.
The valve should close Port A. The boiler should fire, pump run and the pipe on the Port B side should
get hot.
CENTRAL HEATING ONLY.
Set the cylinder thermostat to minimum or turn the HW off at the programmer.
Set the room thermostat to maximum and turn the CH on at the programmer.
The valve should close Port B. The boiler should fire, pump run and the pipe on the Port A side should
get hot.
HOT WATER AND CENTRAL HEATING.
Set the room and cylinder thermostat to maximum and turn the HW and CH on at the programmer.
The valve should be in the mid-position. The boiler should fire, pump run and the pipes on both Port A
side and Port B should get hot.
Reset both thermostats and the programmer to their normal settings.
Please note the above assumes that both programmer and thermostats are being used. If this is not
the case, ignore the action described for the item not fitted.
SPARES
The actuator and body for the Z322XL mid-position valve can be purchased separately as spares or as
replacement parts(see page 1).
The Z322XL consists of a 3 port valve body (Ref.B322XL) to
which a self-contained actuator (Ref.A322XL) is attached.
Page 1
INSTALLATION AND CONNECTION SHOULD ONLY BE CARRIED OUT BY A SUITABLY QUALIFIED PERSON
AND IN ACCORDANCE WITH THE CURRENT EDITION OF THE IEE WIRING REGULATIONS.
A CLASS ‘A’ SWITCH (HAVING CONTACT SEPARATION OF AT LEAST 3MM IN ALL POLES) MUST BE
INCORPORATED IN THE FIXED WIRING AS A MEANS OF DISCONNECTING THE SUPPLY, NORMALLY AT THE
CONSUMER UNIT. THE SYSTEM MUST BE APPROPRIATELY FUSED.
WARNING : ISOLATE MAINS SUPPLY BEFORE COMMENCING INSTALLATION
B322XL - BODY
A322XL - ACTUATOR
COMMISSIONING
