This is the other end of evaporator coil, during hot gas defrost small pipe is condenser coil and large pipe is evaporator coil I believe dunham bush designed this way to keep thermal heat rejection...
Type: Posts; User: MadeInAustralia
This is the other end of evaporator coil, during hot gas defrost small pipe is condenser coil and large pipe is evaporator coil I believe dunham bush designed this way to keep thermal heat rejection...
This is unit label inner aluminium fin, the coil is a dual HEX.
The vertical copper riser on the right is a liquid header.
The small vertical riser pipe on the left is a condenser header.
The large vertical pipe on the left is a suction header.
The pipe...
Freon 22 but now running r407c
Long term storage room of a non-acidic fresh produce. The room is medium temp but hot gas defrost.
Old school equipment will look amazing if cleaned the manufacturers took pride in paintwork in those days.
All shiny
Hit by fork truck too
It appears clean but it was filthy
Reclaim Cylinders, are provided to enable contractors to easily collect any unwanted refrigerant for return to supply house.
Pumpdown Cylinders, these cylinders are designed to allow contractors...
This is an old dunham bush coil on a walk in cooler, i found the pipework was rather interesting so thought id share, coil is 65 years old.
IP or Metric
Start by learning the difference between long term and short term storage refrigeration. Also where did you get the numbers of 32 to 40F for walk in coolers.
Most compressor manufacturers don't list k-factor data of fasteners and code books don't list k-factor data of flare nuts and yet you got all these techs running around with a torque wrench.
You could make one yourself its very easy
1. For a split phase motor R switch down, L switch down, R switch up
2. For a cap start motor as above but remove white jumper wire and install start...
Out of my 1950's refrigeration supply house catalogue.
I was at 11.6:1 ratio but could have been out a couple PSI this all happened rather quickly so could have been very close to the 10:1 ratio but Emerson also state the scroll unload at approximately...
Emerson states compressor unloads at 10:1 so I assume if I keep ratio at 9.9:1 I should be able to pump to atmospheric / 0PSIg or am I mistaken?
When hosing condenser the condensing temp can be...
Don't think it was the thermo disc as it was cycling fast, I definitely exceeded the 10:1 compression ratio when doing the pump out, guess I gotta hose the condenser when pumping out a system with an...
Probably not much of a trick but a Supco time clock I turned into a hermetic motor starter.
Was working on Emerson scroll compressor and when pumping it down, pressure on high side dropped from 240PSIg to 220PSIg and suction dropped to 6PSIg then it sounded like a pressure relief engaging...
They can't put DRED mode on commercial refrigeration but they been planing it for resi HVAC for a long time now, it basically allows the power company and gov to throttle back the speed of...
The gov like inverters because it will allow them to use something called DRED mode.
Is it possible customer poured warm tap water onto the evaporator coil?
The 6mm metric Emerson supplied copper slipped backwards through my standard 1/4 flaring block, that's how I realised it wasn't 1/4" copper, then the Emerson supplied flare nut wouldn't fit on...
Anyone come across this on Emerson low pressure controls, Emerson claim flare nut is 1/4 inch but the copper is actually 6mm metric and the back of flare nut is 6.2mm.
Ive noticed a lot of Chinese manufacturers putting multiple smaller hydrocarbon refrigeration units in one self contained outdoor unit. pretty sure its so they can get around maximum charge limits on...
Now you included a buffer tank raises more issues, is there a pressure relief on the buffer tank? what are its ratings where does it vent to? is the buffer tank located outdoors? Is it a twin coil...
Code also only sets out bare minimum requirements, you should be working well above code
You have assumed secondary cooling circuits are not covered under code. What happens if the heat exchanger between the water and hydrocarbon leaks? the hydrocarbon is then in direct communication...
Standard flare nut will work, if you go with Danfoss mechanical flare 3/8 copper washer is needed.
Locally made flare nuts are banned in Europe and most countries outside USA if the system contains a flammable gas and is located inside occupied space, but it is permitted to use a mechanical made...
world wide? most of the world uses ISO 5149 or EN378, these codes not only allow the use of A2L and A3 in residential and commercial applications but also the use of B2L, the codes are also a decade...
Roger that
Do you know if the gasket was failing during a vapour compression or an actual slug, some older compressors can fail externally when slugging i much prefer a safer compressor.
How about Engineering tradesperson
Let us know what the design sh and commissioning results were also check what the factory setting of the sh alarm is suppose to be in the compressor manual which should be on site.
No suction sh means either flooding or slugging at compressor inlet.
Causes for fault alarm could be many such as transducer or temp sensor, expansion valve open too far, overflow of low side...
Not good, at this point i would be checking the design data provided on the commissioning report sheet by the installing contractors engineers and then checking what that actual readings were on the...
How old is the plant how long has this fault been happening
Does this ammonia plant have roundsmen or operators
Freon 22 was considered by the old timers as rip off LOL, as it was almost twice the cost of arcton 6 and freon 12, twice the cost of freon 11 and methyl chloride and three times the cost of sulphur...
A lot of those era fridges were classified as a cyclic defrost fridge meaning they had a thermostat with a constant cut in of around 4C where is the thermostat bulb located?
Belt drives don't like long periods of non use, typically the shaft seal will dry up, gas then will leak or when compressor starts the shaft seal will be scorched causing leakage, at that point most...
slctech
Typically the manufacturers would install the purge cock valve so when it was activated with a key the refrigerant would blow away from you and not directly at you, that means when you're...
RCD / GFCI will soon be mandatory
Thats a Mayson TXV Type L model LS for sulphur dioxide
Model LM was Methol Chloride
Model LF was Freon 12
A lot of really old stats and pressure controls back in the day had mercury contacts and were claimed as being safe to use in explosive type environments due to the mercury contacts, so be sure to...
Heres a photo of an old belt drive with a liquid level indicating valve its just below the king valve, they were commonly used on 99% of all belt drive units as they were a very low cost valve, but...
No you would pull out an old 3/16 purge cock key to activate the the liquid level indicators that ALL old receiver vessels had, most old school systems can't be charged to beer can cold.