Oil Type for HSN

[mbc]

Hi
In bitzer document for R=404A has BSE 170
pour point of this oil =-28
if we want ti run Evaporator SST = -45
Condenser SDT = +45
still document is showing BSE 170

can we use SL 32
Pour point = -48

thanks
MBC

[mbc]

Hi
waiting for reply.
Thanks

[Brian_UK]

Bitzer document uses BS170 over range +7.5°C to -50°C

Check docs here https://www.bitzer.de/gb/en/documentation/?lng=en&lang=en

[GHAZ]

Hi if you use thin oil, it won't seal the screws properly to pump,

[mbc]

Hi
pour point of BSE 170 is about - 28
our SSD is - 45 and Evaporator working all the time
( O2) system and we do not have a defrost to return oil
I looked the docs in Bitzer it wrote BSE 170
I put mail to them Bitter but ......
some thing is not right

[Brian_UK]

If you do not trust the manufacturer then you wont trust anyone else.

[RANGER1]

Hi if you use thin oil, it won't seal the screws properly to pump,

I don’t really agree on that entirely.
Oil selection usually to do with evaporating temperatures so not to thick to return.

[mbc]

Hi
Dear Brian
I trust them and read all of docs in there's sits
But I put this question to them
first they wrote oil should be BSE 170
When I told them about pour point they mailed me BSE32

I did a lots work with HSN and used BSE 170
( more than 60 cold rooms )
But all of them was cold rooms ( -35 c) with defrost system
this one has not defrost so I am not sure about type of oil
for R 134A they wrote -25 c

[chemi-cool]

From My experience with Bitzer, Do not use any other oil.

What is the compressor model?

[mbc]

Hi

It is HSN 7471-75
with ECO
SST = -45
SDT= 45
R 404 A

Before I used R 22 and oil were B100 it is mineral oil
now I am going to use R 404 A

[cricri]

hi mbc,

when you are reading the oil specifications, "In bitzer document for R=404A has BSE 170
pour point of this oil =-28" >>> these -28 are for pure oil.
in your system, refrigerant is mixed with oil and there is no problem in using BSE 170 at low temperatures.
using iso32 oil you will get a high refrigerant concentration in oil at HP stage, low oil viscosity, and bad lubrification at bearings.