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MYSON POWER EXTRA
SPRING RETURN MID-POSITION
MPE 322 /328 & MPE3 3/4“ / MPE3 1”
3 PORT 22mm VALVE
Thank you for choosing a MYSON heating control.
The MPE 322/328 is designed to control water circulation in primary hot
water and central heating circuits, by diverting flow to either circuit or to
both simultaneously using a single valve.
For convenience the two neon indicator lights illuminate indicating which
port is open.
When the manual lever is moved to the right, ports A and B are open, this
is used when filling, venting or draining the system. The spring return,
Mid-Position actuator – valve rests in the hot water only position.
TECHNICAL SPECIFICATION
Motor Supply Voltage 230 V AC
Frequency 50 Hz
Power Consumption 6 W
Motor Insulation Rating Class ‘F’
Maximum Working Pressure 10 Bar
Maximum Water Temperatur e 95o C
Maximum Ambient Temperature 52
o
C
KV value 6.6
Switch Rating 3(0.5) A
High Temperature Silicon Cable 1100mm
Valve Body Brass with spring loaded
Mica filled PTFE shoes
Actuator Power to Open
Spring to Close
MPEDOC001 Issue: 8
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INSTALLATION INSTRUCTIONS
Step 1. Select Valve Position:
Choose a suitable position for the valve in the
circuit to be controlled, which allows sufficient
access for wiring and maintenance.
The position chosen must not isolate the boiler
from the open vent or the cold feed pipe wo
rk.
The valve may be fitted in a horizontal, vertical or
inclined orientation. The valve must not be fitted
on the return circuit.
The actuator must not be fitted below the valve
body.
Step 2. Fit Valve Body to Pipe work:
Fit the valve body using the 22mm
compression nuts provided. Ensure
that the valve body is only gripped on
the hexagonal faces at the valve ports.
Take care not to over tighten. Port A
should be connected to CH and Port B
connected to DHW.
Step 3. Fit Actuator to Valve Body:
Position the actuator on the valve body by locating the
spindle in the cam slot.
Rotate actuator until the locating lug (shown) lines up
with locating lug-hole on the mounting plate (shown).
Fix the actuator to the body by lightly tightening the
screws provided.
Set the override lever to MID. Fill, test and thoroughly
flush the system.
VALVE
BYPASS
AUTO
VALVE
THREE PORT
DOMESTIC HOT
RADIATORS
PUMP
BOILER
WATER CYLINDER
Locating Lug
Manual Lever
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Step 4. Electrical Connections:
The actuator is fitted with 1100mm of 4-core cable for connection of the system
equipment. The installation will be simplified by the use of an electrical junction box into
which all the system equipment can connect.
The actual wiring connections will depend on the system equipment used, following the
wiring principle outlined below.
The MPE 322 is doub le insulated and requires no earth
connection.
IMPORTANT: The
wirin g mu st co mpl y w ith
current I.E.E.
regulations. Ensure
mains supply to all
controls is fused at no
more than 3A. Mains
isolating switch must
have contact separation
of at least 3mm.
Step 5. Commissioning:
When the installation is complete, filled and vented, check that the valve operates
correctly.
Switch on the Hot Water Controls, i.e. programmer and cylinder thermostat: the valve
should remain at Port B with the DHW neon lighting.
MPE 322
B
AB
A
S
ystem Controls To Be
FUSED 3A MAX
C.H. CONTROLS
OFF
ON
BLUE
D.H.W. CONTROLS
WHITE
ORANGE
GREY
PUMP
BOILER
N
L
ON
OFF
Switch on the Heating controls, i.e. programmer and room thermostat: the valve should
move to the MID position i.e. both outlet ports open and both neons lighting.
Switch off the Hot Water controls, the valve should move to open Port A only with the
CH neon lighting.
Notes:
a. Ensure that the actuator is not covered with thermal insulation, or in contact with
pipe work or other materials.
b. When the valve is fitted in confined space, ample ventilation must be provided to
ensure that the valve is kept within the specified ambient temperature range.
c. The valve actuator is not designed f or co nt i n uo usl y po wered operation.
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MPE 322 Spares Description Part No.
Actuator with 421001
Fixing screws
22mm 3 Port 421002
Mid-Position
Valve body.
B
AB
A
PRODUCT INTERCHANGE WIRING GUIDE
3-PORT MID-POSITION
Landis & Gyr MA-V322
Honeywell V4073A
Danfoss DMV3M
Drayton Flowshare
Tower MP3
ACL 679H340
Orange
Grey
White or Brown
Blue
Green/Yellow
Hot Water ON
Hot Water Off
Heating ON
Neutral
Earth
White
Orange
Blue
Grey
AB
ABB
22MM
A
Landis & Gyr SK3
Randall HSA3
Potterton PMV3
Sunvic SD1701
Heating ON
Hot Water Off
Hot Water ON
Earth
Neutral
Grey
Blue
Orange
White or Brown
Grey
Blue
White
Orange
22MM
BBAA
AB
MPE322
MPE322
Yellow
Orange
Blue
White
Switchmaster
Blue
Neutral
Earth
MPE322
AB
White
Hot Water ON
Hot Water Off
Heating ON
Grey
Orange
BB
22MM
AA
Green/Yellow
Red
Pump / Boiler
Live
MYSON CONTROLS, MYSON LTD., EASTERN AVENUE, TEAM VALLEY,
GATESHEAD, TYNE & WEAR, NE11 OPG
SALES OFFICE No.: 0845-402-3434
IN ACCORDANCE WITH OUR POLICY OF CONTINUAL PRODU CT IMPROVEMENT, WE RESERVE THE RIGHT TO AMEND THE SPECIFICATION OF THESE
PRODUCTS WITHOUT PRIOR NOTIFICATION
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