SmartHome motorhome – pressure water pump

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Updated – November 20, 2023

In the series of articles SmartHome motorhome Various topics will be described with program examples based on HomeMatic / RaspberryMatic, which have arisen from practice over time and have proven to be useful - here the automated switching on and off of the pressure water pump.

Switching off – why?

Pressure water pumps are usually installed in larger motorhomes and ensure constant water pressure, while suction pumps controlled by operating a tap only pump water when the tap is open.

In the event of a hose leak, the pressure water pump will empty the entire water tank before quitting service due to dry running and bearing damage.

While you are in the motorhome, you will be warned by the pump noise alone if a hose leak has occurred. However, by the time you have access to the pump, found the electrical connection and disconnected it, a few liters of water will probably have leaked out. You won't notice anything when you're away and will hardly welcome the flood when you return. Likewise, hardly anyone will notice it in deep sleep.

For quick access, the use of an easily accessible wall button is recommended. In the program the wall button is marked WT_WP_K1, accordingly WallButton_WaterPump_Channel1 designated.

All of this should be implemented via the following program.

Requirementsen

Logic

In order for presence and absence to be detected, geofencing must be active and the so-called zone variable(s) must be set accordingly.

The zone variables are made up of the word Zone followed by the name of the respective cell phone, e.g Zone iPhone Anton.

Hardware

For example, a 4-way switching actuator (12 V) is used to switch the pressure water pump. HM-LC-Sw4-WM needed. In the program the name is SA_WP_K1, accordingly SwitchActuator_WaterPump_Channel1, designated.

Conditions

Before creating the program, the triggering conditions must be clarified as to when the pressure water pump should be switched off or on.

• Absence/Presence
• Night/day time
• Actuation of wall button

Program

Variables

• Zone xxx
• Zone yyy
• CCU_im_Reboot

Checking the status of the variables CCU_im_Reboot prevents the program from being executed if the control center has just been restarted, since ALL programs are basically started once after a restart.

The original system variable “Presence” must be included in the logic variable CCU_im_Reboot be renamed by default true is. This is programmed with an empty(!) condition and a delay of 60 seconds incorrect set.

All programs that should NOT be executed upon restart must be in the “Condition If …“including those with AND linked statement “System status CCU_im_Reboot at incorrect just check" contain.

Devices

• SA_WP_K1
• WT_WP_K1

Program flow – WP_AUS

The pressure water pump is switched OFF with a long press (longer than 0.5 seconds) of the assigned button. The pump (example and adjustable) is also switched OFF during the night on weekdays from 10:00 p.m. to 7:00 a.m. and on weekends from 10:00 p.m. to 8:00 a.m., as well as when you are away.

Channel status: WT_WP_K1 when button is pressed for a long time Channel selection: HG_SW_II_WP_K2 immediately Switching status: Off

Condition:

IF …
Device selection WT_WP_K1 when pressed for a long time

OR
Timing control
Time: Time range from 10:00 p.m. to 7:00 a.m
Serial pattern: daily, every day except weekends (Mon. to Fri.)
Validity period: Start: March 30, 2023, no end date
trigger at points in time

AND
If false, just check the system status CCU_im_Reboot

OR
Timing control
Time: Time range from 10:00 p.m. to 8:00 a.m
Series pattern: daily, weekends (Sat., Sun.)
Validity period: Start: March 30, 2023, no end date
trigger at points in time

AND
If false, just check the system status CCU_im_Reboot

OR
Trigger system status zone xxx when away from home when there is a change

AND
Only check the system status of zone yyy when away from home

AND
If false, just check the system status CCU_im_Reboot

OR
Only check the system status of zone xxx when you are away from home

AND
Trigger system status zone yyy when away from home when changed

AND
If false, just check the system status CCU_im_Reboot

Activity:

Then …
X End any ongoing delays for these activities before executing
(e.g. retriggering).

Device selection WT_WP_K1 immediately Switching status: Off

Program flow – WP_ON

The pressure water pump is switched ON by briefly pressing (up to 0.5 seconds) the assigned button. Likewise, the pump (example and adjustable) is switched ON on weekdays from 7:00 a.m. to 10:00 p.m. and on weekends from 8:00 a.m. to 10:00 p.m., as well as when you are away.

Channel status: WT_WP_K1 when the button is pressed for a long time Channel selection: HG_SW_II_WP_K2 immediately Switching status: On

Condition:

IF …
Device selection WT_WP_K1 briefly when pressed

OR
Timing control
Time: Time range from 7:00 a.m. to 10:00 p.m
Serial pattern: daily, every day except weekends (Mon. to Fri.)
Validity period: Start: March 30, 2023, no end date
trigger at points in time

AND
If false, just check the system status CCU_im_Reboot

OR
Timing control
Time: Time range from 8:00 a.m. to 10:00 p.m
Series pattern: daily, weekends (Sat., Sun.)
Validity period: Start: March 30, 2023, no end date
trigger at points in time

AND
If false, just check the system status CCU_im_Reboot

OR
Trigger system status zone xxx when away from home when there is a change

AND
Only check the system status of zone yyy when away from home

AND
If false, just check the system status CCU_im_Reboot

OR
Only check the system status of zone xxx when you are away from home

AND
Trigger system status zone yyy when away from home when changed

AND
If false, just check the system status CCU_im_Reboot

Activity:

Then …
X End any ongoing delays for these activities before executing
(e.g. retriggering).

Device selection WT_WP_K1 immediately Switching status: On