Boiler Fault Finder

Programmer and Time Switch Guides

Terminal Comparisons 5

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Terminal Comparisons 4

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Terminal Comparisons 3

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Terminal Comparisons 2

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Terminal Comparisons 1

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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…

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