Forgive me, I spend most of my days working on larger commercial/industrial systems. few questions about retail reach-in coolers, not really specific to an individual brand or model.
let's use a True 2-door R134A cap tube for example. 2-fan induced draft ,single pass evaporator, medium temp, 1/4 ton, air-cooled.
A) the factory spec charge of 14oz... is this from 0psig, or does it account for refrigerant required to break vacuum to flat? reason asking is because I often notice lower than expected pressures after recharging straight from an evacuation. generally I add a couple more ounces and conditions seem better after that.
B) sometimes at the evaporator, typically inside the compartment right next to the coil, i will find what I assumed was a suction drier. I was recently told that this was actually an accumulator. wondering if this is indeed the case. the ones I've seen are typically not painted, and although similar in shape, they do not look like a standard Sporlan C-052 or whatever. wondering if I have to account for this when trying to diagnose a plugged cap or other restriction.
C) do these reach-ins act and conform to the typical running conditions that you would expect on a walk-in? examples: between 10-20F TD between cabinet and coil temp. saturated condensing at 20F to 30F higher than ambient. 10F to 15F Delta-T drop in air temp across the evaporator.
D) how important are drain pan discharge line circuits, in terms of desuperheating. if I am feeling lazy, can I cut out the corroded/pitted copper and just go straight to condenser instead? negating concerns about condensate overflowing the pan eventually
[link] [comments]
No comments:
Post a Comment