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30-01-2023, 04:41 AM

MrFreez717 replied to a thread VSD Pump control in Fundamentals

Not true for compressors. Centrifugal pumps and fans, yes. Gear drive pumps, no. For centrifugal pumps, flow varies linearly with pump...

12 replies | 243 view(s)

30-01-2023, 04:10 AM

RANGER1 replied to a thread VSD Pump control in Fundamentals

Harper, Yes true for compressors, pumps, fans etc. If at full speed all the time, less efficient due to losses. Some glycol systems...

12 replies | 243 view(s)

29-01-2023, 01:51 AM

dvb_gsm started a thread R5F21258 /UPD78F1146A Programmer in Domestic

Hi.. I am looking to read and write the following microcontrollers -R5F21258 -UPD78F1146A - or send the name of the programmer who supports...

0 replies | 49 view(s)

27-01-2023, 07:54 PM

MrFreez717 replied to a thread pipe sizing spreadsheet in Tools and Calculators

I have one for ammonia pipe sizing that is pretty good. The developer distributed it freely several years ago, so I would have no problem emailing...

1 replies | 75 view(s)

27-01-2023, 07:52 PM

MrFreez717 replied to a thread cooling load- defrost in Fundamentals

I think you would overestimate the heat load from defrosting if you used the input power of all the heating elements. A substantial amount (I would...

2 replies | 85 view(s)

27-01-2023, 06:47 PM

seanf replied to a thread cooling load- defrost in Fundamentals

For your set cooling period, look at the number of defrosts needed, the length of time each defrost lasts and the power of the heating elements. Then...

2 replies | 85 view(s)

27-01-2023, 06:32 PM

seanf replied to a thread THERMO KING TS200 Insufficient Cooling in Transport

https://www.ctrserv.com:8443/phprunner/phprunner10.1/manuals/output/Parts%20&%20Service%20Manuals/thermo%20king/ts200300.pdf Theres a engine...

3 replies | 120 view(s)

27-01-2023, 06:04 PM

Jaymo replied to a thread THERMO KING TS200 Insufficient Cooling in Transport

After carrying out a self test, the system failed and i got Alarm codes 28 PRETIP OR SELF CHECK ABORT and Alarm Code 40 CHECK HIGH SPEED CIRCUIT....

3 replies | 120 view(s)

27-01-2023, 04:42 PM

TrickyRikki started a thread Bluebox Tetris 2 in Trouble Shooting

Afternoon all, It's been a while since I've posted, I was wondering if anyone has much experience with bluebox chillers. Basically I have a...

0 replies | 50 view(s)

27-01-2023, 12:20 PM

mechman started a thread pipe sizing spreadsheet in Tools and Calculators

hi is anyone aware of an spreadsheet available for refrigerant pipe sizing?

1 replies | 75 view(s)

27-01-2023, 11:45 AM

Harper replied to a thread VSD Pump control in Fundamentals

...Sorry I was wrong about grundfos, here is the correct statement: For example, if the flow is reduced by 20 %, the motor’s power consumption...

12 replies | 243 view(s)

27-01-2023, 10:54 AM

mechman started a thread cooling load- defrost in Fundamentals

hellos what is the guideline what allowance has to be made for the defrost on the cooling load calculation electrical elements as well as hot gas...

2 replies | 85 view(s)

27-01-2023, 10:48 AM

mechman started a thread equipment selection running hours in Commercial

Hi Folks regarding equipment selection/ duty for typical multiplex system is my running time figures acceptable? running hours of 18 hr/ 24 for...

0 replies | 52 view(s)

26-01-2023, 07:10 PM

RANGER1 replied to a thread VSD Pump control in Fundamentals

Harper, do they suggest a certain Hz, do they have a curve to match for maximum efficiency. Sometimes all sounds good until VSD drive dies, new...

12 replies | 243 view(s)

26-01-2023, 03:07 PM

Harper replied to a thread VSD Pump control in Fundamentals

Thank you guys for the helpful answers! I know that a VSD pump is not always necassary, but it´s always interesting. Grundfos says there is a...

12 replies | 243 view(s)

26-01-2023, 10:26 AM

timalg replied to a thread need help to understand the control in Fundamentals

any idea please my friends?

1 replies | 74 view(s)

25-01-2023, 11:41 PM

timalg started a thread need help to understand the control in Fundamentals

Hi, i need your help my friends,an hvac engineer have a problem: he works on a chiller system which includes 3 danfoss pumps with embedded variable...

1 replies | 74 view(s)

25-01-2023, 10:43 PM

RANGER1 replied to a thread VSD Pump control in Fundamentals

Larger systems can have 2 &/or 3 way valves, buffer tanks with hot/cold side to smooth things out. If DX imagine slow changes to be able to adjust...

12 replies | 243 view(s)

25-01-2023, 10:40 PM

seanf replied to a thread Auxillary comes on one minute after beginning of cycle in Heat Pumps

If you give the make and model of the heat pump, the ambient temp, indoor temp and thermostat set point temperature (degree C or F) when you seen...

1 replies | 119 view(s)

25-01-2023, 10:09 PM

seanf replied to a thread VSD Pump control in Fundamentals

Guess you need to consider what the water/glycol/brine is being used for. But yer it could be pressure. It could be that you look at what loads are...

12 replies | 243 view(s)

25-01-2023, 09:54 PM

Harper replied to a thread VSD Pump control in Fundamentals

Most of the chiller i know have a carel or danfoss eev. This type of valve works properly, but what would be if you regulate the water flow? @...

12 replies | 243 view(s)

25-01-2023, 07:41 PM

Charmed started a thread Daikin Altherma 3 and termostats in Heat Pumps

Hi! I have a question if anybody has a clue about this situation? We have Altherma EHVX04S23E6V and 7 room thermostats. Underfloor heating is...

0 replies | 71 view(s)

25-01-2023, 04:18 PM

jjarman123 started a thread Auxillary comes on one minute after beginning of cycle in Heat Pumps

I first noticed this back in December when we had some unusually cold weather, in the teens, which is not normal for South Mississippi.* I realize...

1 replies | 119 view(s)

25-01-2023, 08:46 AM

RANGER1 replied to a thread VSD Pump control in Fundamentals

Lots of possible set ups. What type of TX or EEV would you use. Also would you use HB products?

12 replies | 243 view(s)

25-01-2023, 07:43 AM

SnowBro replied to a thread Eliwell Free Studio Plus in Controls

re-bumped...

3 replies | 609 view(s)

24-01-2023, 10:27 PM

seanf replied to a thread VSD Pump control in Fundamentals

Would you not leave the DX chiller to do its own thing, regulating itself to the load the chiller sees. Then run the VSD pump on its own control,...

12 replies | 243 view(s)

24-01-2023, 09:09 PM

SeniorHVAC replied to a thread climaventa chiller & W3000 Controller in Refrigeration Books

Hi Mate, many thank managed to sort it out

2 replies | 127 view(s)

24-01-2023, 08:54 PM

Harper replied to a thread VSD Pump control in Fundamentals

Hi Ranger1, if never seen or heard about an "Liquid Pressure Amplification", is it the same as an refrigeration pump? I have to search more about...

12 replies | 243 view(s)

24-01-2023, 07:32 PM

seanf replied to a thread THERMO KING TS200 Insufficient Cooling in Transport

It could be quite a few things or multiple things, start with the basic stuff and go from there. Is the condenser and evaporator clean and clear...

3 replies | 120 view(s)