TXV icing but room warming

[liptow]

Hello cool people,
First time post for me.

If your Thermal Expansion Valve and distributor lines are icing but your walk-in is warming above setpoint, what are the first things that should come to mind in terms of diagnostics?

I just figure it is low on refrigerant but could somethin be wrong with the design?

We're talkin 2HP Copeland w/ r134a for a 4c room.
TXV is Alco with MOP thermal bulb charge.

Thanks folks, Joe.

[NoNickName]

1) Low on gas. Check SH, SC and eventually fill it up.
2) Liquid solenoid blocked. Change diaphragm.
3) Liquid filter clogged. Replace core.

[Andy]

1) Low on gas. Check SH, SC and eventually fill it up.
2) Liquid solenoid blocked. Change diaphragm.
3) Liquid filter clogged. Replace core.

4) Lack of subcooling, poor refrigerant quality after the expansion valve

Kind Regards Andy

[wambat]

Strainer on inlet of TXV partially plugged

[frank]

If your Thermal Expansion Valve and distributor lines are icing but your walk-in is warming above setpoint, what are the first things that should come to mind in terms of diagnostics?

Obviously the evaporator is not full of liquid and so the duty is reduced. Why it is not full of liquid is subject to investigation.

[liptow]

Thanks all.
And Frank, can I be in your foursome?
Joe

[frank]

Thanks all.
And Frank, can I be in your foursome?
Joe

have you got any clubs?

[Peter_1]

What's a 4c room? I personally like more a 5 W room
Pressures readings?
Temeprature readings SH and SC?

[Actinide]

I play golf, do I qualify?