Programmer and Time Switch Guides

Programmer and time switch compatibility guide

Programmers do vary in their settings/functions and the differences are as follows:

  • 24 hour programmer – one set of times all week
  • 5/2 day – one set of times for week days/ another set of times for weekends (but weekend times may be set the same as for weekdays).
  • 7 day – different times for each day of the week.

There are two types of programmer

Mini programmer

The hot water mode can be switched on without the heating mode, but in order to switch on just the central heating, the hot water will also simultaneously come on with it. (This will be common on gravity hot water systems with fully pumped heating). The temperature of the domestic hot water can reach very high temperatures in this arrangement, as whilst the heating is on, gravity convection currents take place and cycles until heating is satisfied via room thermostat or more commonly the boiler thermostat.

Should a temperature rise occur within the radiators during the summer months whilst on hot water mode only, then the anti-gravity valve (fitted on central heating flow pipe) may be faulty “letting-by”.

Full programmer

The hot water mode and heating mode can be switched on totally independent from one another or both modes can be on at the same time. (This will be common on fully pumped systems).

Some two channel programmers will share the time base (common time base) which means both hot water and heating must share the same on/off periods.

The following compatibility guides are a quick and easy reference tool to upgrade and replace existing programmers and time switches to Drayton models, indicating the respective time base (24 hour, 5/2 day or 7 day) and respective terminal comparisons (E, N, L, H/W ON/OFF, C/H ON/OFF).

Simply look through the existing makes and models within the faulty programmer sections or within the faulty time switch sections and the “Boiler Fault Finder” will show all recommended Drayton replacements.

Then simply look through the programmer or time switch terminal comparison tables to ascertain the necessary back plate wiring conversion.

Please note: In the event of removing any existing programmer, it is paramount to make note of the wire colours, the terminal positions and the numbers in relation to the existing back plate.

You may find the existing faulty programmer or time switch model has been discontinued, however, by using this guide, it will indicate the suitable replacement.

Some recommended replacement models maybe a direct plug in replacement without any disturbance to the wiring, some models may need simple minor wiring conversion and some models may need both the back plate and the wiring changed. The manufacturer must be consulted at all times if there is any doubt whatsoever.

24 hour programmer compatibility guide

Existing make and model:

Danfoss Randall
102, 102E, 922, 3020P, 3060, 4033, SET2,
SET2E, SET3, SET3E, SET3M, CP15, CP715,
CP715 SI, FP15, FP715, FP715 SI, MP15

Suitable replacements for above:
LP112 (Electronic, linked H/W & C/H – common time base)
LP241 (Electronic, independent H/W & C/H)
LP241 SI (Electronic, independent H/W & C/H)
SM2 (Electromechanical)

Existing make and model:

Drayton
TEMPUS 3 & 6

Suitable replacements for above:
LP112 (Electronic, linked H/W & C/H – common time base)
LP241 (Electronic, independent H/W & C/H)
LP241 SI (Electronic, independent H/W & C/H)
SM2 (Electromechanical)

Existing make and model:

Honeywell
ST699, ST6200, ST6300, ST9400A, ST9400S

Suitable replacements for above:
LP112 (Electronic, linked H/W & C/H – common time base)
LP241 (Electronic, independent H/W & C/H)
LP241 SI (Electronic, independent H/W & C/H)
SM2 (Electromechanical)

Existing make and model:

Horstmann
525, Centaur Plus C21, Diadem, H21, H121, TC1, Tiara

Suitable replacements for above:
LP112 (Electronic, linked H/W & C/H – common time base)
LP241 (Electronic, independent H/W & C/H)
LP241 SI (Electronic, independent H/W & C/H)
SM2 (Electromechanical)

Existing make and model:

Myson
MEP2C

Suitable replacements for above:
LP112 (Electronic, linked H/W & C/H – common time base)
LP241 (Electronic, independent H/W & C/H)
LP241 SI (Electronic, independent H/W & C/H)
SM2 (Electromechanical)

Existing make and model:

Potterton Myson
MINIMINDER, 2000

Suitable replacements for above:
LP112 (Electronic, linked H/W & C/H – common time base)
LP241 (Electronic, independent H/W & C/H)
LP241 SI (Electronic, independent H/W & C/H)
SM2 (Electromechanical)

Existing make and model:

Siemans/Landis&Staefa
RWB200

Suitable replacements for above:
LP112 (Electronic, linked H/W & C/H – common time base)
LP241 (Electronic, independent H/W & C/H)
LP241 SI (Electronic, independent H/W & C/H)
SM2 (Electromechanical)

Existing make and model:

Sunvic
SP50, MP2, SELECT 207

Suitable replacements for above:
LP112 (Electronic, linked H/W & C/H – common time base)
LP241 (Electronic, independent H/W & C/H)
LP241 SI (Electronic, independent H/W & C/H)
SM2 (Electromechanical)

5/2 day programmer compatibility guide:

Existing make and model:

Danfoss Randall
102E5, CP15, CP75, CP715, CP715 SI, FP7, FP15,
FP715, FP715 SI, FP975, MP15, MP75, SET5

Suitable replacements for above:
LP522 (Electronic, independent H/W & C/H)
LP522 SI (Electronic, independent H/W & C/H)

Existing make and model:

Drayton
TEMPUS 4,6,7

Suitable replacements for above:
LP522 (Electronic, independent H/W & C/H)
LP522 SI (Electronic, independent H/W & C/H)

Existing make and model:

Honeywell
ST6450

Suitable replacements for above:
LP522 (Electronic, independent H/W & C/H)
LP522 SI (Electronic, independent H/W & C/H)

Existing make and model:

Myson
MEP2C
Suitable replacements for above: LP522 (Electronic, independent H/W & C/H)
LP522 SI (Electronic, independent H/W & C/H)

Existing make and model:

Potterton Myson
EP2001, 2002

Suitable replacements for above:
LP522 (Electronic, independent H/W & C/H)
LP522 SI (Electronic, independent H/W & C/H)

Existing make and model:

Siemans/Landis&Staefa
RWB9, RWB252

Suitable replacements for above:
LP522 (Electronic, independent H/W & C/H)
LP522 SI (Electronic, independent H/W & C/H)

Existing make and model:

Sunvic
SELECT 207

Suitable replacements for above:
LP522 (Electronic, independent H/W & C/H)
LP522 SI (Electronic, independent H/W & C/H)

7 day programmer compatibility guide:

Existing make and model:

Danfoss Randall
102E7, 972, CP15, CP75, CP715, CP715 SI, FP75,
FP715 SI, FP975, MP75,

Suitable replacements for above:
LP722 (Electronic, independent H/W & C/H)
LP722 SI (Electronic, independent H/W & C/H)

Existing make and model:

Drayton
TEMPUS 7

Suitable replacements for above:
LP722 (Electronic, independent H/W & C/H)
LP722 SI (Electronic, independent H/W & C/H)

Existing make and model:

Honeywell
ST6400, ST9400C

Suitable replacements for above:
LP722 (Electronic, independent H/W & C/H)
LP722 SI (Electronic, independent H/W & C/H)

Existing make and model:

Horstmann
527, CENTAUR TC7, CENTAUR PLUS C27,
H27,

Suitable replacements for above:
LP722 (Electronic, independent H/W & C/H)
LP722 SI (Electronic, independent H/W & C/H)

Existing make and model:

Myson
MEP2C

Suitable replacements for above:
LP722 (Electronic, independent H/W & C/H)
LP722 SI (Electronic, independent H/W & C/H)

Existing make and model:

Potterton Myson
EP3000, 3002, 6000, 6002

Suitable replacements for above:
LP722 (Electronic, independent H/W & C/H)
LP722 SI (Electronic, independent H/W & C/H)

Existing make and model:

Siemans/Landis&Staefa
RWB9, RWB270

Suitable replacements for above:
LP722 (Electronic, independent H/W & C/H)
LP722 SI (Electronic, independent H/W & C/H)

Existing make and model:

Sunvic
SELECT 207, SP100

Suitable replacements for above:
LP722 (Electronic, independent H/W & C/H)
LP722 SI (Electronic, independent H/W & C/H)

24 hour time switch compatibility guide:

(All the following Danfoss suitable replacement time switches have
Volt – free contacts, making them suitable for combi boilers).

Existing make and model:

Danfoss Randall
103, 911, SET1, SET1E, TS15, TS715, TS715 SI,

Suitable replacements for above:
LP111 (Electronic) LP111 SI (Electronic)
SM1 (Electro mechanical)

Existing make and model:

Drayton
TEMPUS 1

Suitable replacements for above:
LP111 (Electronic) LP111 SI (Electronic)
SM1 (Electro mechanical)

Existing make and model:

Honeywell
ST6100A, ST9100A, ST9100S

Suitable replacements for above:
LP111 (Electronic) LP111 SI (Electronic)
SM1 (Electro mechanical)

Existing make and model:

Horstmann
CENTAUR SC1, CENTAUR PLUS C11, CORONET, H11

Suitable replacements for above:
LP111 (Electronic) LP111 SI (Electronic)
SM1 (Electro mechanical)

Existing make and model:

Myson
MEP1C

Suitable replacements for above:
LP111 (Electronic) LP111 SI (Electronic)
SM1 (Electro mechanical)

Existing make and model:

Potterton Myson
EP 4000

Suitable replacements for above:
LP111 (Electronic) LP111 SI (Electronic)
SM1 (Electro mechanical)

Existing make and model:

Siemans/Landis&Staefa
RWB30, 50, 100

Suitable replacements for above:
LP111 (Electronic) LP111 SI (Electronic)
SM1 (Electro mechanical)

Existing make and model:

Sunvic
SP20, SELECT 107

Suitable replacements for above:
LP111 (Electronic) LP111 SI (Electronic)
SM1 (Electro mechanical)

5/2 day time switch compatibility guide:

Existing make and model:

Danfoss Randall
103ES, SET4, TS15, TS715, TS715 SI, TS75, TS975

Suitable replacements for above:
LP711 (Electronic LP711 SI (Electronic)

Existing make and model:

Drayton
TEMPUS 1, 2

Suitable replacements for above:
LP711 (Electronic) LP711 SI (Electronic)

Existing make and model:

Myson
MEP1C

Suitable replacements for above:
LP711 (Electronic) LP711 SI (Electronic)

Existing make and model:

Potterton Myson
EP 40001, 4002

Suitable replacements for above:
LP711 (Electronic) LP711 SI (Electronic)

Existing make and model:

Siemans/Landis&Staefa
RWB152

Suitable replacements for above:
LP711 (Electronic) LP711 SI (Electronic)

Existing make and model:

Sunvic
SELECT 107

Suitable replacements for above:
LP711 (Electronic) LP711 SI (Electronic)

7 day time switch compatibility guide:

Existing make and model:

Danfoss Randall
103E7, 971, TS75, TS715, TS715 SI, TS975

Suitable replacements for above:
LP711 (Electronic)
LP711 SI (Electronic)

Existing make and model:

Drayton
TEMPUS 2

Suitable replacements for above:
LP711 (Electronic)
LP711 SI (Electronic)

Existing make and model:

Honeywell
ST6100C,ST9100C

Suitable replacements for above:
LP711 (Electronic)
LP711 SI (Electronic)

Existing make and model:

Horstmann
CENTAUR SC7, CENTAUR PLUS C17, H17, 517

Suitable replacements for above:
LP711 (Electronic)
LP711 SI (Electronic)

Existing make and model:

Myson
MEP1C

Suitable replacements for above:
LP711 (Electronic)
LP711 SI (Electronic)

Existing make and model:

Potterton Myson
EP 5002

Suitable replacements for above:
LP711 (Electronic)
LP711 SI (Electronic)

Existing make and model:

Siemans/Landis&Staefa
RWB170

Suitable replacements for above:
LP711 (Electronic)
LP711 SI (Electronic)

Existing make and model:

Sunvic
SP35, SELECT 107

Suitable replacements for above:
LP711 (Electronic)
LP711 SI (Electronic)

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