Revision as of 19:34, 25 January 2022

Installation

It is not clear whether tubing can be left coiled - [1]. Install manuals say so - one of the diy systems with precharged line sets there instructions specifically state to coil the excess at the system. - but author speculates that since lubricating oil is also carried with refrigerant, there could be an issue.
- This link says coiling is ok (see comments) [2]
- Manufacturers state it is ok. Installers say 'install it properly by cutting to size'. Who do you trust? [3]
- 5-10' coiled - works 3 years running [4]. Other guys in same thread say that coiling will fail after some time. If coiled, lay them out horizontally.
First principle calculations say - Say there is 8 feet of coil left.

Point - disconnect vacuum After filling up low pressure side with 1 PSI of refrigerant- [5]
- 1 lb? Not 1 atm? Under 1 lb, 14 psi of atmosphere would mean that air actaully leaks into the tubing.
- Note that instructions say to 'let in refrigerant for 5 seconds with quarter turn of valve' - steps 9-10 on page 30 of manual [6]. This is not correct - we should look at the actual valve, no? Video says 1 lb - also not correct. The right way should be to look at the valve, not by time - but by when valve reads a little above atmospheric pressure of 14 psi.

Heat pump for heating and cooling that works down to -20F. 7kW of heat.

@@ Line 8: / Line 8: @@
 **This link says coiling is ok (see comments) [https://mrcool.com/blog/pre-charged-line-sets-real-right/]
 **Manufacturers state it is ok. Installers say 'install it properly by cutting to size'. Who do you trust? [https://hvac-talk.com/vbb/threads/1620681-Mini-Split-line-set-looped]
+**5-10' coiled - works 3 years running [https://www.garagejournal.com/forum/threads/can-you-coil-line-sets.400977/]. Other guys in same thread say that coiling will fail after some time. If coiled, lay them out horizontally.
 *First principle calculations say - Say there is 8 feet of coil left.