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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Asbestos

Asbestos

Asbestos – the hidden dangers! Asbestos components may take the form of seals, gaskets, insulation panels and rope within old appliances, especially aged boilers. There are three types normally encountered in the UK: Chrysotile (white) Amosite (...
Boiler Servicing Procedure

Boiler Servicing Procedure

Service procedure for boiler and heating engineers when visiting and servicing all types of commercial boiler
240 V TEST

240 V TEST

The 240V Test checks boilers for mains power supply to the boiler terminal strip.
Mains voltage and polarity tests

Mains voltage and polarity tests

This test will ascertain the correct polarity between L and N although, some boilers will operate unaffected by reversed polarity. Connect boiler to power supply via 3 pin plug top or inserting 3 amp fuse into switch Ensure boiler is on but with...
Resistance to Earth

Resistance to Earth

Resistance to earth: (dead test) This test confirms the integrity (resistance) of the insulation between L (Live) and E (Earth) on the boiler terminal strip or plug top pins (Black lead firstly to Earth pin and red lead secondly to Live pin). Check...
Short Circuit

Short Circuit

Short circuit: (dead test) This test will ascertain the integrity of the internal resistance of the boiler and should read no resistance/infinity between L and N on the 3 amp fused plug top pins. Set multimeter on ohms scale for resistance readings...
Mains Voltage Test

Mains Voltage Test

Mains voltage test: (dead test) This test isolates the power supply serving the boiler, so as safe, further testing can be continued, without the risk from stray electrical currents causing a shock. Electrically isolate power supply at fused spur...
Earth Continuity Test

Earth Continuity Test

The Earth Continuity Test will ascertain whether the earth continuity between the earth supply to the boiler and the internal component earth connections and the metal casing of the boiler is earthed correctly.
General Fault finding

General Fault finding

The professional heating engineer’s complete "Boiler Fault Finder" for boiler and central heating fault finding. "Boiler Fault Finder" results from years of experience as a professional service and repair engineer, demonstrating technical expertise w...
Boiler Shuts Down

Boiler Shuts Down

Boiler shuts down and goes to lockout Fault Fix faulty pump (not at full capacity) Check the pump for signs of damage, test the electrical connections, and replace if necessary. Replace pump head faulty fan (not at full...
Maximising boiler condensation operation

Maximising boiler condensation operation

There is now a requirement in the Domestic Building Services Compliance Guide that states that where condensing boilers are installed, the system should be designed to operate at lower temperatures to give a return water temperature less than 55 degrees...
Programmer and Time Switch Guides

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...
Safe use of Multimeter Functions

Safe use of Multimeter Functions

The Safe use of MultiMeters for Heating Engineers
Sequence of Boiler Operation

Sequence of Boiler Operation

What is the sequence of boiler operation for domestic boilers? This guide will take you through the boiler operations that happen when the boiler is being used.
Service Engineer's Toolkit

Service Engineer's Toolkit

Heating Engineer and Plumbers Service Toolkit items required to fix boilers and other heating equipment.
System Component Testing

System Component Testing

Boiler System Component Testing - for Heating Engineers
Air Pressure Switches (Testing)

Air Pressure Switches (Testing)

Testing the boilers Air Pressure Switch, is always an indicator that other problems may exist. This article helps to diagnose the Air Pressure Switch issues on a boiler.
Air Pressure Switches (General)

Air Pressure Switches (General)

Air pressure switches (operating @ approx. 0.5 – 4 m/bar pressures) See also: How to test your Air Pressure Switch with a multimeter Reasons an air pressure switch will fail to start: Loose electrical connections Kinked or split rubber h...
Thermostats

Thermostats

Boiler Fault Finding - Thermostats - See also: Cylinder Thermostats Room Thermostats Thermostats Overheat Cut out Thermostats Liquid Expansion Electrical Safety Checks - Resistance to Earth Top Tips for the Heating Engineer...
Thermistors

Thermistors

What is a thermistor used for in a combi boiler
Boiler Fans

Boiler Fans

Reasons a fan will fail to start No 240V supplying (L) & (N) terminals Burnt out motor windings Worn out bearings Air rotor jammed (on fan casing) impeller heavy with foreign matter accumulation Faulty fan speed control resistor (if fitted) ...
Circulating Pumps

Circulating Pumps

A failure of the circulating pump can cause a number of problems, such as reduced heating and hot water performance, and can result in the boiler shutting down.
Top Tips for the Heating Engineer

Top Tips for the Heating Engineer

It sometimes pays to test the air pressure hoses with (LDF) Leak detection fluid, when encountering ignition problems. (Hoses maybe split or have loose connections). Where the air pressure switch is difficult to access (which is most common), test...