Frozen Unico

[Senior Tech]

Okay all you experts...frozen unico air handler with amana condensor...

Pressures
200 High
42 Low

Static Pressure
1.70" Supply
.10" Return

78* Return
Damn Cold Supply

85* Ambient

This is a 2 ton system with 8 supplies and one return, has a txv (new) and clean filter and coil....getting more info via nextel...tech on site...back with more soon...had 0* subcool til he added freon...

[Edited by senior tech on 06-04-2005 at 11:25 PM]

[berad]

undercharged

[berad]

depending on the linset length it should be at lest 10 degree subcooling on r-22

[Senior Tech]

8* subcool now...still freezing...

[berad]

by freezing do you mean the coil is frozen in sheets or frosting on the suction line?

[berad]

just reread the original post, you know unico is supposed to have six to eight supplies per ton right?

[chicago installer]

what size is your return? i hope it is at least 12"

[beenthere]

As berad said, it should be a min 6 full outlets per ton newer systems, and 5 on the older systems.

Max supply sp is 1.5 iwc, and min is 1.1 iwc.

[aircooled53]

Check the slide adjustment at front of Unico for tonnage settings,and I agree min. 6 supply per ton. to find some area's to install some supply..Never going to work right until S.P. is down 1.1-1.3..

1000 cfm is max. on Unico

[beenthere]

Originally posted by aircooled53
Check the slide adjustment at front of Unico for tonnage settings,and I agree min. 6 supply per ton. to find some area's to install some supply..Never going to work right until S.P. is down 1.1-1.3..

1000 cfm is max. on Unico

And thats a 5 ton unit.

He's on a 2 ton.

[hvacprodmgr]

Summarize,

1 word.

Airflow......

Check your supply plenum adapter adjustment and add more outlets.

What is your motor amperage ? It has alot to do with Unico System set-up

[tinknocker service tech]

not enough supplies
5 outlets per ton as long as they are under 12 ft
better to have 6 per ton and the restricter plate cant be ajusted to proper motor anps unless the supplys are correct
40 cfms per supply
these are unico requirements
have the tech read the install book if it is still with the unit

[berad]

Another episode of shameful unico treatment brought to you by the Service Experts. Senior's an ok guy, but there is only a handful of guys with braincells working with him these days.