Myson MPE 228 Installation guide

MYSON POWER EXTRA
SPRING RETURN ZONE VALVE
MPE 228 / MPE2 1” - 2 PORT 28mm VALVE
Thank you for choosing a MYSON heating control.
The MPE 228 is designed to control water circulation in primary hot water or
central heating circuits. The motor is powered to open the valve with a spring
return to the closed position.
The valve is not directionally sensitive and may be fitted with flow through either
Port A or Port B.
For convenience the neon indicator light illuminates, indicating when the valve is
open.
When the manual lever is moved to the right, the valve is open. This is used when
filling, venting or draining the system. The spring return valve rests in the closed
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 Temperature 95o C
Maximum Ambient Temperature 52oC
KV value 7.3
Switch Rating 3(0.5) A
High Temperature Silicon Cable 1100mm
Valve Body Brass with spring loaded
Mica filled PTFE shoes
Actuator PowertoOpen
SpringtoClose
MPEDOC003 Issue: 8

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 work.
The valve may be fitted in a horizontal,
vertical or inclined orientation and may
be fitted on either the flow or return
circuit.
The actuator must not be fitted below
the valve body.
Step 2. Fit Valve Body to Pipe work:
BOILER
PUMP
RADIATORS
TANK
TWO PORT
VALVES
AUTO
BYPASS
VALVE
Fit the valve body using the 28mm
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.
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 MAN. Fill, test and
thoroughly flush the system.
PORT B PORT A
Locating Lug Manual Lever

Step 4. Electrical Connections:
The actuator is fitted with 1100mm of 5-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 228 is double insulated
and requires no earth connection.
IMPORTANT:
The wiring must
comply with
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. AB 28MM
AUX. SWITCH
3A. 230V
ORANGE
GREY
BROWN
BLUE
STAT.
NLOFF
ON
System Controls To Be FUSED 3A MAX
WHITE
COM
N/C
N/O
MOTOR
MICRO-
SWITCH
Step 5. Commissioning:
When the installation is complete, filled and vented, check that the valve operates
correctly. Switch on the system controls, i.e. programmer and thermostats: The
valve should move to the open position. When fully open any equipment connected
to the valve’s auxiliary switch should operate.
Switch off the heating controls: The valve should spring return to the closed
position and auxiliary equipment should cease to operate.
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 for continuously powered operation.

MPE 228 Spares Description Part No.
Actuator with 421103
Fixing screws
28mm 2 Port 421202
Valve body.
PORT B PORT A
A
28MM
B
WIRING GUIDE
2-PORT ZONE 28mm
AB 28MM
ORANGE
GREY
BROWN
BLUE
STAT.
OFF
ON
WHITE
COM
N/C
N/O
MOTOR
MICRO-
SWITCH
Permanent Live
Make Safe (for fully pumped system) or
Switched Live to Boiler
Switch Live
Neutral
Earth (Not Required)
Switched Live to Pump (for gravity system)
NOTE: For fully pumped systems the White wire is unused and should be made
safe by wiring into a blank terminal. The pump and boiler should both be
connected to the Orange wire.
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 PRODUCT IMPROVEMENT, WE RESERVE THE RIGHT TO AMEND THE SPECIFICATION OF
THESE PRODUCTS WITHOUT PRIOR NOTIFICATION