Low Ambient Piston

[stanyoung]

I Have 3 15 ton cond air-cooled cond. units all 6 months old which all have 1 inch stroke low ambient pistons controlling the damper in the discharge duct. All units are having a problem running in cold weather by tripping on low pressure. All circuits have low press bypass timers. Does anyone think switching to a 2 inch stroke piston would be more responsive. Thanks for any responses.

[dandyme]

your profile doesn't give any indication why you would need this kind of info.

[stanyoung]

I guess I never spent much time while registering to update any profile. I'm a service tech in NYC

[kdocsr05]

Assuming that your condition is a result of low head pressure, you may want to go with a motorized head pressure control system. I thought the old mechanical damper controls we obsolete.

You can talk to West at (212) 947-3100 for the details.


Regards

[stanyoung]

Thanks but we installed this equipment and I can't make any big modifications. I'd much rather use a pressure transducer with an actuator in the damper but I was wondering if a 2" stroke would be more responsive. The cond fan motor is 5 hp. I'll try Wes at industrial tomorrow. Thanks.

[kdocsr05]

I’m fairly sure the pricing will be similar for the motorized controls.

[Murphcoair]

I had a couple giving me grief last winter over at the brooklyn piers, the dampers were not closing completely on shut down, so the head would never get a chance to build up on start. Those were Carrier SCAV'S with after market low ambient dampers. After adjusting the dampers they were o.k.

[stanyoung]

Thanks for the suggestions. Just tried the motorized actuator with a press transducer but the motor wouldn't respond fast enough causing my head and back pressures to drop. Going to get drives with transducers that should do it.

[kdocsr05]

Stanyoung,

If you are using the Belimo AMQB 24 actuator the stroke timming is adjustable on the motor.


Regards