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Check the install manual and local code book. Or call local inspection department.

Tube with remote dip stick or sight glass is common.

Open and drain the evap water side during final pulldown. Running pump can still freeze if any tubes are blocked.
Go to 32*f sat shut down for a bit and watch for rise. Repeat a couple of times...

Took a 1/2 book before he could say he screwed up…����

Not seen any new manuals recommend triple evac.

Some inspectors ask for a copy of the manual for requirements.

Recommendations, suggestions, should, & may are just as defined.

Ask for a copy of the installation manual or down load one online.

Anything “shall” “will” “must” “required” is code.

Look it up again

txv's have limited turndown and max capacity. See vendor specs for capacity corrections. Typical turndown is ~30% of corrected capacity with a few as low as ~20%.

adobe construction...

Not sure of yeast ph.
Cu tube tu fin might work.
All stainless with a tighter fin per inch definitely better than corroded cu tube/al fin
More passes or more face

Lower water temp or lowee temp...

Kinda miss the mail order bride ads

Rest are easily ignored

Some have model number nominal ratings, some you can find in the product manuals, some only found on the equipment order data

More contaminates are carried in the liquid lines.
Suction filter dryers are usually left out after cleanup.
Acid test & check oil color & filter dryer pd.

Common with “cut & paste” technical writers. Would edit it out of a new revision only to find it in the next revision.

Schrader & angle valves at the top of condensers were called purge valves till after montreal protocol.
Lp units had/have purge units.

And most mfg instructions are the minimum under best conditions. I would add 1.5x to be safe. They are always trying to out do the competition.

Just a little egg in the face

As long as the drawings have the engineers seal!



Yea right

A lot depends on the system piping and evaporator type.
Brazed plate & flooded evaps are far mor critical on oil changeouts.

Multi stage system and high glide refrigerants may not play well together. Best to verify with mfg first.

Should have a check valve to prevent back flow.
Verify check valve seals and check inside of pump tank.

Is it pump fed or gravity drain?

May require a high static fan…

Working warranty on recip chillers, I found suction filters did more damage than good due to improper sizing and installation.

Size for <5 psid, never install horizontal, only vertical or diagonal...

Yes, by the vendors. One has 3 different oils based on pump type and usage.

Holland America cruise ship just lost 2 crew members in “engineering dept”, good chance it was asphyxiation from ref….

Frogs with necks & skinny legs!

Sds list flash points, toxicity & ppm for asphyxiation.

Ashrae oil riser return tables provide assessment for double risers. Doubt if needed with only one unloader/60% minimum loading.

Copeland has oil adjustment instructions base on ref charge. If I...

How many unloaders?

.

Evaps should be self draining into a trap & riser to the height of the coil.
Horizontal lines sloped in direction of flow.
Increase line size at tee before down.
Trap should be streel els. If line...

Flow loss while running
Improper shutdown
Exv not shutting fully
Compressor discharge checks leaking

Manual j evaluation for the total envelope should take 1-2 hours on site & 1-2 hours in office. Maybe double for room by room.

Usually envelope as part of bid, room/room prior to installation...

Or bearings bad

Manufacturers have test labs and years of experience. Glad you have time, materials, and equipment to experiment with. I can't afford to

M m o is an oil additive designed for combustion engines. 10-30 % solvent with a low boiling temperature.

Makes absolutely no sense for a vacuum pump. Use the mfg recommendation.

Depends on the type metering and system design.
Model number?
Full log sheet helps.

The old single stage yorks had a large evap sight glass, full load design, top row of tubes was wet. Could...

Inverted starts can cause lp, oil loss, flood back or flooded starts.

Condenser water temp should be at least ~20*f above chill water temp. 2 way valve minimum, 3-way preffered.

Hail guards also can provide some dampening of gusting winds and some trash & vandal protection.

called pid

Short cycling reduces dehumidification, increases indoor humidity, reduces compressor motor, contactor & fan motors life.

869007

I put together a sheet with 30+ causes of oil failure. Lot of potential causes

Called pride.

Av or avv locktite is the only hard set I’ve used with the most sucess

Scrolls are more limited on the low speed end.
Rotaries do not require higher differential pressures to seal & pump.

Rotaries have far less liquid tolerance and lower life cycle, but probably...

Copeland scrolls by far the most durable. Any dealer should easily confirm.

Concrete takes a while to cure & should be sealed also

Concrete floor? Sealed?