installing a remote switch

I have cooling unit with an on/off switch inside the casing. I want to install a remotely controlled on/off switch. I have already purchased the remote switch and have tested it on a household light and it works fine at a distance of 25 yards. In fact, it is an RF type switch that works through walls, etc. The switch (relay) module has mains input/output wires 240 V A/C and a maximum load of 1000watts.

Here's the wiring diagram of the cooling unit:

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I would like to switch the compressor on and off with the remote switch or if that's not possible, then switch the whole thing on/off.

The question is where do I put it?

Reply to
jim
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switch and

yards. In fact,

module has

that's not

That particular unit operates by using the refrigerant pressure in the suction line as a thermostat- closing on pressure rise corresponding to to cut-in temperature. That particular switch is connected at the bottom just to the left of the compressor with PK/BR wires labeled "in-line connectors"- closing those switch contacts, shorts PK/BR and connects "LINE" to RD on the upper terminal block- RD routes to middle "modular terminal block" and wire color BR to common RUN/START winding connection of compressor- then from RUN to BLK and START to WH to CAP to BLK which is connected to Neutral at upper terminal block. The same pressure switch also throws power to the FAN and its components. That circuit also passes the full unit load power and is most likely beyond the rating of a 1000W remote switch- you may need to use the switch to control a contactor which closes the main circuit. Also- it is not clear what you want to do with this control. If you want to enable the unit to start its normal cooling operation, off otherwise, then put your switch

*in series* with the BR wire at the pressure switch; if you want to override the temperature regulation, then use your switch to short switch PK/BR together. At least this is what it looks like to me.
Reply to
Fred Bloggs

This statement "The switch (relay) module has mains input/output wires

240 V A/C and a maximum load of 1000watts" says nearly nothing specific. If your switch module throws live power, or if there is any doubt about what it does exactly, then wire a contactor into the pressure switch circuit, and use your module to throw power on the contactor coil.
Reply to
Fred Bloggs

wow, thanks for that reply. My knowledge of electronics is very limited. I need time to digest your answer.

Yes, my statement about the remote module didn't say much. Here is more information about the remote:

Switches any 240V mains supply Wire in module means it can be concealed Suitable for projects and appliance manufacturers Up to 5A switching loads Suitable for flourescant lighting RF remote works through walls and ceilings Simple AC In/Out connections Compatible with the PC Home Control system RA5605

Emissions Compliance: EN55022:1996 Handheld remote battery: 12V Alkaline A23 (supplied) Immunity Compliance: IEC 802-1 and EN50082-1 Site Code: 8 Bit - 256 Combinations pre-set Range: 25 metre (open-air), 12-15m average Frequency: 433.92MHz Wireless Transmission: DTI Licence Exempt MPT1340 Maximum Load: 5A (1200W)

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Reply to
jim

I would like to switch off the unit by an override as you described. thanks.

Reply to
jim

I read in sci.electronics.design that jim wrote (in ) about 'installing a remote switch', on Mon, 14 Mar 2005:

They can't spell 'incandescent' and 'fluorescent' and their cited EMC standards are obsolete. I would advise extreme caution, especially considering your acknowledged inexperience with electronics.

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John Woodgate

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