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Danfoss Randall can accept no responsibility for possible errors in catalogues, brochures and other printed material. Danfoss Randall reserves
the right to alter its products without notice. This also applies to products already on order provided that such alterations can be made without
subsequent changes being necessary in specifi cations already agreed.
Danfoss Ltd
Ampthill Road,
Bedford MK42 9ER.
Telephone: (01234) 364621 Fax: (01234) 219705
Email: ukheating@danfoss.com
Website: www.heating.danfoss.co.uk
Part No: 7459v18 06/08
INTERNAL WIRING MODEL 102 INTERNAL WIRING MODEL 103
Water
Output
Heating
Output
L
N
Mains
Supply
12 3 56
HW
W
OFF
NOTE: Terminals 3 and 6 MUST be linked externally
(except when voltage free switch contacts are required).
Terminals
Output
L
N
Mains
Supply
12 3 56
NOTE: Terminals 3 and 6 should (in most instances) be linked externally.
Exceptions are when control circuits are operating at low voltage (e.g. 24 volts) or for certain
Combination Type Boilers (see Boiler Manufacturers Handbook).
Terminals
CONSTANT
TIMED
OFF
TYPICAL EXTERNAL CIRCUITS TYPICAL EXTERNAL CIRCUITS
102 Terminals
102 Terminals
L
N
Mains
Supply
L N Boiler
L N
123
5
6
Pump
N
Room
Stat
Com
Call
Link
1) Typical domestic gas or oil fi red system with
gravity hot water and pumped heating. (If a
room stat is not requires wire pump L directly to
terminal 2 on the 102).
2) Fully pumped system with cylinder stat in HW
circuit and room stat and 2 port spring return
zone valve in heating circuit.
L
N
Mains
Supply
L N
N
Room
Stat
Com
Call
Link
123
5
6
To Boiler & Pump
N
L
Motor
HP2 spring return
zone valve
Blue
Grey
Brown
C
12
Cylinder Stat L641A
1) Control of Heating Function only (Mains
Voltage)
Note: If room thermostat is not required
join timeswitch terminals 1 and 2 with a
link suitable for full load current).
2) Control of Low Voltage Systems
(e.g. warm air gas valves, low voltage
burners).
L
N
Mains
Supply
L N
123
5
6
N
Com
Call
Link
L
N
Mains
Supply
123
5
6
103 Terminals
103 Terminals
Room
Stat
Load
Terminals
Low voltage
supply
Load
Low
voltage
room stat
3) Typical gas or oil fi red heating system with
gravity hot water primary and pumped heating.
4) Typical control of heating when used with
combination type boilers.
123
5
6
NOTE: Ease of installation can be achieved by using the Danfoss Randall
Wiring Centre which is obtainable from most Builders Merchants and
Distributors.
IF A WIRING CENTRE IS USED, follow the installation instructions included
with the unit and not the wiring diagrams shown on this page.
123
5
6
L
N
Mains
Supply
N
Call
Link
Room
Stat
Pump
Terminals
L N
Boiler
Terminals
L
N
Mains
Supply
N
CallRoom
Stat
Input Output N L
Boiler Terminals
Com
Com
103 Terminals
103 Terminals
INTERNAL WIRING MODEL 106
12 3 56
Terminals
4
Water
Priority
Heating
Priority
OFF
L
N
To boiler & pump
Fully pumped system with 3 port (2 way) diverter valve.
L N
Orange not
connected
(make safe)
If Danfoss Randall HS3 valve is used
connect valve brown and grey to
terminal 2 of 106
Room Stat
COM
SAT
CALL
Cylinder Stat
COM
SAT
CALL
L
N
Typical
External
Circuit
Honeywell 'W' plan or Satchwell 'K' plan.
Orange
L N
2


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  • Hello can I plug a danfuss 106 straight replacement for a 102 Submitted on 15-12-2021 at 17:08

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