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Thread: FZ 114 High Pressure Switch
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26-04-2015, 08:13 PM #1
FZ 114 High Pressure Switch
Hi all. I'm not a refrigeration engineer and I need some help please.
I bought an ex Sainsburys van fridge box to use as a cold room for my farm shop. It came with some Hubbard wiring diagrams which although are pretty basic, helped me wire it up. I got it running off a new large leisure battery and with the help of a large battery charger, it ran for 2 days but was turned off at night. I kept getting a fault code on the controller which flashed HPS but it carried on running perfectly with temperature going down to 2 degrees, stopping and restarting at 4 degrees with the odd defrost in between. Then I shut it down to tidy up the wiring to the controller which I had left at the length it came with. I shortened it to the length I needed so as to mount the controller where I wanted it. When I went to restart it there was a very loud click and nothing. The controller was showing HPS fault. The loud click which happens every time I tried to start is the HPS switch switching on and immediately switching off again.
Does any one have any idea what the problem could be.
Thanks for any help.
John
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27-04-2015, 08:53 PM #2
Re: FZ 114 High Pressure Switch
Is the fan on the outside part of the unit running from memory it has a plug on it so you can disconnect when removing the cover.
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27-04-2015, 09:42 PM #3
Re: FZ 114 High Pressure Switch
Yes the fan was running and yes it has a disconnect plug.
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27-04-2015, 10:14 PM #4
Re: FZ 114 High Pressure Switch
That's strange because if it's been off for a while like overnight the head pressure would drop and if it sensed high pressure it would stop and show that alarm you may have a faulty switch but you need to know what pressure is in the system and you are not a fridge engineer with test gauges do not even be tempted to bypass the switch,get a local fridge man out this thing isn't in a hot environment is it giving the condensor a rinse out would do no harm the condensor is the outside bit use a hose and washing up liquid not a pressure washer as that would damage the fins.
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27-04-2015, 10:25 PM #5
Re: FZ 114 High Pressure Switch
Hi swissjohn.
I am with cadwaladr, you seem to be locked out on a H.igh P.ressure S.witch Fault.
This may be electrical or Mechanical or both?
I am guessing the click is the compressor or Fan contactor. But the safety circuit is holding off the supply?
Anyway as suggested contacting a local "Fridgie" is the best bet now.
Where are you in the U.K. Someone on the forum should respond.
Grizzly
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28-04-2015, 07:54 PM #6
Re: FZ 114 High Pressure Switch
Thanks for your replies Cadwaladr and Grizzly.
What I forgot to mention in my original post is that I had my local man who looks after my shop freezers and chillers out to re gas it (I won't tell you why - it's embarrassing )
The 12v power cable connects to a largish switch - I'm presuming magnetic, and when I press the on button on the controller the switch is activated and supplies power to the control panel which in turn powers everything that needs power. This is the switch that makes the loud click as it activates and straight away switches off again.
Because of all the HPS fault codes I had that didn't affect the running and then the final one that stopped it from running do you guys think the switch might be faulty or could it be the circuit board in the control panel. If it is the switch it looks as though I would have to have it regassed again.
Your thoughts please.
Thanks. John
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28-04-2015, 07:56 PM #7
Re: FZ 114 High Pressure Switch
Oh by the way, I'm in skegness.
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28-04-2015, 09:38 PM #8
Re: FZ 114 High Pressure Switch
Hi John.
A bit far for me then!
I am intrigued as to what is happening?
You could have an issue with the supply contactor / largish switch, or it could be a safety / control circuit issue
as already discussed.
Maybe the coil in the contactor is faulty or the contacts are pited and were sticking in before.
Who knows I can think of lots of issues that can be easily eliminated once on site and actually looking at what you have got!
I think you need your fridge guy back to at least assist with the diagnosis.
Sorry but the fault showing has a relevance.
Interesting all the same! Please keep us informed.
Grizzly
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28-04-2015, 10:15 PM #9
Re: FZ 114 High Pressure Switch
Back again. This switch would not be item 48 would it?
Grizzly
Attachment 1373813TST024 Cabin Controls 2Need Unit SN# A.C. Motor Plate 3Need Unit SN# D.C. Motor Plate 42QECFZ1002 Electric Panel 10Need Unit SN# Base 113CND172 Condenser 123CVS017 Solenoid Coil 14Need Unit SN# Right Condenser Closing 152708024 Left Condenser Closing 163CGT052 Belt 7M=615 (CN7MR615) 173CGT088 Belt 7M=650 poliflex 183002083 Case FZ114 193CMP605 Compressor FRASC.C204 O.ESTERE 213PMS002 Crunckshaft seal 233FLT100 Filter 3/8 FSA 253GRI041 Grid 29Need Unit SN# Humidity Indicator 323MOR038 Terminal Board 333MTR090 Electric Motor 343MTR022 D. C. Motor MP80L 12V G1400 W600 353MTV090 Fan 362011090 Separator Bracket 373PRS040 Pressure Switch Hp 383PLG075 Pulley D.70 7M D.14 393PLG074 Pulley D.110 7M OMT 403PLG121 Pulley D.70 7M D.24 423RBN102 Shut off valve 433SRP002 Tank 442706006 Filter Support 452700505 Valve Support 483TLR110 Contactor 493VRP004 Regulating Valve 503VLS028 Solenoid Valve 523SPZ003 Brushes
33EVP266 Evaporator 42708042 Cover 53DDO071 Nut X ATT.O-R 11/16"-16 UN 63DDO072 Nut X ATT.O-R 13/16"-16 UN 73BUL058 Thermostatic Valve 92GUN006 Union 11/16”-16Un(3/8 Or)C.Fl 102GUN007 Union 13/16"-16UN(1/2 OR)C.FL 113GRI040 Grid 123GUR026 Gasket O-R 8x2 133GUR027 Gasket O-R 12X2 143INF002 threaded insert M 6 153MTV077 Fan 163ORF002 Orifice 01 TEF/Y/X 2 173RND038 Plain Washer D.6X12 183SNS061 Thermostat Probe 192708043 Bracket 203TPO017 Cap 213TPO018 Cap 223VTE195 Screw 6x16 Last edited by Grizzly; 28-04-2015 at 10:24 PM.
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29-04-2015, 12:32 AM #10
Re: FZ 114 High Pressure Switch
Does this thing run on twelve volts dc or 240 ac ? If 12 are the brushes ok in the drive motor.
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29-04-2015, 05:47 AM #11
Re: FZ 114 High Pressure Switch
Hi again Grizzly. Yes, that looks like the switch that does the clicking. It is the first thing that has 12v to it all the time. I now know what it's called and thanks very much for taking the time to find and list the exploded diagram.
Cheers. John
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29-04-2015, 05:50 AM #12
Re: FZ 114 High Pressure Switch
Hi again Cadwaladr. Yes, it is 12v only and the motor runs fine. I've powered that up directly to test it.
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29-04-2015, 06:41 AM #13
Re: FZ 114 High Pressure Switch
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29-04-2015, 02:19 PM #14
Re: FZ 114 High Pressure Switch
Apollo thirteen comes to mind on this one ha ha.
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29-04-2015, 05:01 PM #15
Re: FZ 114 High Pressure Switch
What I intend to do now is try bypassing the HPS temporarily to see what happens. If it fires up and runs ok then by my thinking it shows that the HPS is at fault and vice versa.
The Contactor has power going in all the time but only activates when I press the Go button on the controller. So there must be power going through to the CPU circuit board for the Controller to function. If the HPS is not at fault then it must be either the Contactor coil OR the CPU Circuit board. But which one?????
Talking to you two on here helps me think things through and writing my thoughts down helps as well.
So thank you both for bothering to help.
I will report back and let you know what happens. It won't be tonight because I have to go to the wholesale fruit market which is in Hull, 70 miles away. No sleep tonight!!
Thanks again guys.
Cheers. John
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04-05-2015, 09:15 PM #16
Re: FZ 114 High Pressure Switch
Well, it's been a busy weekend in the shop so could only have a look today. Did what I said I would - bypassed the HPS and guess what - it works. Runs like a dream.
Now, I know that I shouldn't do it, but I really think it is just the switch. I only had it regassed just before the problem occured and as I said earlier, I kept getting HPS error messages with no sign of a problem. I now have to source a new HPS and get my fridge man out to fit it and regass it again. I will do this as quick as I can BUT I need to run it during the day to keep my stuff fresh. What do you two think? Can I risk it? What is the worst that can happen? Apollo 13 cadwaladr - thanks for that!!!!!!
Cheers. John
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05-05-2015, 12:41 AM #17
Re: FZ 114 High Pressure Switch
Give that condensor a wash for sure,desperate times call for desperate measures changing the switch will mean no loss of gas because there should be a Schrader valve but make sure you have a spanner on the stub it fastened to.
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05-05-2015, 09:55 PM #18
Re: FZ 114 High Pressure Switch
Thanks for the tips - will do! So it's not going to do an Apollo 13 on me??? Its been running perfectly all day today but switched off for the night.
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05-05-2015, 11:47 PM #19
Re: FZ 114 High Pressure Switch
You could order the part and fit it yourself do as I told you with holding the fitting on the pipework,Hubbard will charge you a pretty penny but may save paying your fridge man another callout.