Build A Low – Power Data Logger

Look down the right hand column of the front page of Zeus. See the “Little Black Box” at the bottom of that column. That’s the Zeus File Bonus Box. When Zeus is generous this is where he puts files that are free to download – no joining – no posts – just click the mouse and download the file. Today learn how to build your own low power Data Logger. Multiple input recording capabilities. If you have an old pc lying around it’s an excellent project that given a little research into some of the terms used in the Article, and a little time will produce an effective, accurate data logger. I’ve built two and still have one that is used in the field.

The Article was written by Steve Ciarcia around 15 or so years ago and the copyright is owned by Circuit Cellar, Inc. – Published here with the permission of Steve and CCI. Thanks guys. Get the file while the gettin’s good – it will be pulled off the Zeus shelf with no advanced warning.

J/B Digital Gauges

J/B DM-2 Intelligent Manifold  

 

“Background info:
Evap coil froze up yesterday.
Bank maint dept added freon and left.
Was frozen again this morning so I got the call. And away we go………………………………………………………………………..Upon arrival noted system off, evap coil clean and clear, 70 degrees outdoor ambient, 72 degrees indoors.Hooked up the J/B’s and fired it up.”

“Long story short, checked air flow, had .48″ TESP, so not an air flow issue.
Ordered a new TXV for this system.I will say that the J/B DM-2 did help to speed up my diagnosis and is a pleasure to use.”

Excerpt of FieldTest Eval. Read the rest of this in progress report: http://hvacprotech.forumwise.com/hvacprotech-thread4182-0-asc-20.html

DRSA | RSA Design Considerations

 DRSA and RSA Design Considerations or What Were You Thinking: An Opinion.

I’ve given a great deal of thought to all of our fieldtest threads but in particular the digital evaluation threads. As an administrator of this board I decline comment on many of these threads that may appear non- impartial or judgmental of any one over the other, to avoid influencing opinions unfairly sometimes that is difficult to do – particularly for a person as opinionated as I am.

I’m talking apples to apples, oranges to oranges in this comment so I am not particularly making any specific references to the J/B DM-2, although some of the points I am trying to make does apply to some aspects of their design as well. To cut to the chase, I am specifically commenting on a comparison between the Testo RSA and the Digi-Cool DRSA, because these are the two instruments that at least in my opinion occupy the same classification as one another.

I’m not bashing either, not recommending either. I own both, I use both and I like both. I am no different than anyone else here, I do have my favorite, but that is irrelevant to the intent of this comment.

There is upon evaluation of the fieldtest data a fundamental thread that is becoming more and more obvious.

Read the Rest of this Discussion: http://hvacprotech.forumwise.com/hvacprotech-thread4980.html

Yellow Jacket 40802 Digital Manifold Gauge

 Yellow Jacket® DRSA FieldTest Evaluation 

“I have just spent a little over 2 weeks with the Yellow Jacket digital manifold set – DRSA. The weather was mild the first week and I thought it would be a bust. The second week I had a good run of process chillers.My impressions are that this is a tool designed by someone who has been in the field.

I use the same mainold and it is familiar, but the gauges are intuitive. I purposely did not read the instructions to see what would happen. Turn them, hit zero and go.

I verified the superheat on all compressors changed and changed a TXV on a 10 ton. Checking superheat with the biult in probe and scale is quick and accurate. The probe lead is of of sufficient length to get “over there” and still have the gauges out of the way. I am not crazy about the velcro wrap glued to the probe. I sometimes stick the probe under the insulation and this makes doing that difficult. I talked to a Yellow Jacket rep at an open house and he said there was a lot of feedback on that probe.

The display is adjustable contrast and I had no trouble seeing it back in a dark corner of a shop with a drop light or in a well lit factory under sodium vapor lights.”

An excerpted quote from our Yellow Jacket® DRSA FieldTest [Just getting underway – join the boards and join the fieldtests. Read the Rest of this thread: http://hvacprotech.forumwise.com/hvacprotech-thread4354-0-asc-0.html

“ANNIE” Rebuild Schematics

Internal Schematics for an ANNIE Rebuild

SCHEMATIC PARTS LIST 

R1 – 8110 – 100K Resistor
R2 – 8110 – 100K Resistor
R3 – 8110 – 100K Resistor
R4 – 8220 – 12K Resistor
R5 – 8220 – 12K Resistor
R6 – 8235 – 8.2K Resistor
R7 – 8506 – Ohms Control
R8 – 8570 – Volts Control
D1 – 4502 – Diode
N1 – 4401 – Red Neon Light
N2 – 4402 – Clear Neon Light
N3 – 4403 – Amber Neon Light
M1 – 1003 – Ohmmeter
M2 – 1031 – Ampmeter
M3 – 1032 – Voltmeter
T1 – 4320 – Transformer Relay
T2 – 4330 – Transformer Current
B1 – 2315 – Battery 1.5 V Size D
F1 – 4220 – Fuse 20 amp
S1 – 7205 – Ampmeter Switch
S2 – 7210 – Voltmeter Switch
S3 – 7305 – Master Switch
S4 – 7310 – Ohmmeter Switch
S5 – 7315 – Capacitor Switch
S6 – 7601 – Start Switch
C1 – 2205 – Capacitor 47 mFd
C2 – 2208 – Capacitor 108 mFd S1 & S2 Are Maintained DPDT Toggle Switch with Centre Off
S3 Is a Maintained DPDT Toggle Switch With Centre Off. Position A is Start Forward, Position B is Start Reverse
½S4 is A Maintained Toggle switch with centre OFF
½S4 is A Maintained Toggle Switch with centre ON
S5 is A Maintained Toggle Switch – Position A, C1 Is engaged, Position B, C2 Is Engaged, Centre Position C1 & C2 Are Both Engaged.
S6 is a Momentary SPST N.O. Push Button Switch

The Schematic

  

Click for full sized image. For fuller detail visit the thread below.

For complete operating Guidelines reference this Article: http://hvacprotech.forumwise.com/hvacprotech-thread300.html

Testo 523 RSA FieldTest Evaluation

A brief excerpt with two supporting clips from ur exclusive 523 FieldTest Evaluation Thread.The following videos show the Testo tracking with the DigiCool together t-ed into the high and low sides of several reefers and truck a/c systems. The first one shows them tracking very close to each other.

The following shows various systems on the reefers working. Solenoid valves opening or closing,unit switching between modes and multi-tep units between heating and cooling between compartments.

 

Read More from this comprehensive evaluation here: http://hvacprotech.forumwise.com/hvacprotech-thread4185-0-asc-0.html

Refco 10805-RD-4 Charge & Evac station

Refco Portable Charge & Evacuation Station 

Portable station 10805-RD-4 for vacuumization and charging of the refrigeration system with the refrigerant: 1 – vacuum-pump; 2 – gas-ballasting valve; 3, 12 – safety valves; 4, 8, 17, 18, 21 – valves; 5 – vacum unit; 6 – vacuum indicator; 7 – handle; 9 – pressure-vacuum gage; 10 – sight glass; 11, 13 – pressure gages; 14 – return valve; 15 – cylinder for refrigerant; 16 – cykinder scale; 19, 22 – pipe sockets; 20 – frame; 23, 24 – tumblers; 25 – electrical panel.

10805-RD-4 station (see the figure) consists of the following elements mounted on the frame: two-stage vacuum pump; cylinder with rotary scale; pressure gage with temperature scales for R12, R22, R502; safety valve and built-in electric heater; pressure-gage unit with pressure gage and pressure-vacuum gage (having scales of temperatures and pressures of R12, R22, R502 refrigerants in the state of saturation), sight glass, valves with pipe sockets fro connection of hoses; vacuum unit with pressure-vacuum gage, valve and safety valve; panel wit electric condenser, tumblers for starting of vacuum pump and electric heater of the cylinder and clamp to connect the station with power network.

In order to fill the station cylinder with the refrigerant, they connect the ballon valve with the filter-dehydrator which is connected with pipe socket 22 with a flexible hose. At open valves 4, 8, 18 and 21, vaccum pump is started with tumbler 24 and the cylinder is vacuumized. After reaching residue pressure equal to 5 Pà, having closed valves 4 and 21, vacuum pump is shut. While opening of the ballon valve, as well as valves 8, 17 and 18 of the station, the cylinder is filled with the refrigerant with its level being controlled. To ensure entering of bigger amount of liquid refrigerant into the cylinder, its vapors are released through return valve.

Using flexible hoses of pipe socket, stations are connected with pipe sockets on suction and charging valves of the compressor of the refrigeration facility. Having started vacuum pump of the station with tumbler 24 at open valves 4, 8, 18 and 17, the refrigeration facility is vacuumized till residue pressure 5 Pà. After 1 hour of operation under this residue pressure, vacuum pump is turned off and keep the system in vacuum during 1 hour. Then, having closed valves 8, 17 and 18, they deliver from the station cylinder into the refrigeration facility the dehydrated refrigerant up to reaching of residue pressure 30…50 êPà, violating vacuum at that which prevents recondensation of water vapors and contributes to their complete removal.

In the same way the second vacuumization of the refrigeration facility is performed and again vacuum is violated.

After the third vacuumization, the refrigeration facility is filled with the necessary amount of the refrigerant from the station cylinder. With that aim all the valves except 8, 17 and 18 are closed. When pressures of the refrigerant in the refrigeration facility and in the station cylinder become equal (which will be seen by cessation of the refrigerant circulation through the sight glass), with the help of tumbler 23 they start electric heater built into the station cylinder. As a result, pressure in the cylinder increases and the refrigeration facility continues to be filled with the refrigerant. The amount of the refrigerant entered into the refrigeration facility is determined by the cylinder scale which has an adjusting frame by the refrigerant pressure in the cylinder.