Hartell Condensate Pump

[Grizzly]

Can anyone help with how the micro switch should be connected on a U62 Condensate Pump.
Got a call out today to a pair of Computer room A/C units. Customer complaining of yet another Alarm senario due to excessive water (condensate) under modular floor.
The above mentioned condensate pumps were found to operate when the reservoir float is depressed and cuts off when float rises!!
Methinks the float micro switch is wired the wrong way round. What think Guys?
Grizzlyhttp://www.refrigeration-engineer.com/forums/images/icons/icon14.gif

[knight rider]

hi grizzlly
yes the do come wired up as you have found it , you can swap the wire over on the micro switch
it gives you either n/o or n/c contact on the micro switch

[The Viking]

Hmmm,
Me thinks you are on to something there.

I once had a little giant with the same problem, it turned out that the micro switch could be fitted either way up. So by turning it around normal operation were resumed.

[Grizzly]

Knight Rider and Viking (Seafairing Pirate.... Honest that's what it say in the Oxford English)
Thank you both for responding, Allways a nice feeling when lucky enough to find an unusual fault. Especially one which could be from new...10 to 12 yrs ago. Quote " we have allways had a periodic condensate problem"
Thanks for the help, I will post when done as to the outcome.
Grizzlyhttp://www.refrigeration-engineer.com/forums/images/icons/icon11.gif

[Brian_UK]

Does the unit have two switches, one for pump and one for alarm?

Has someone wired it through the alarm switch?

[Grizzly]

Does the unit have two switches, one for pump and one for alarm?

Has someone wired it through the alarm switch?
No it's far less soficticated than that Brian. I understand where your going but!
Basically it would appear that the Condesate pump Micro-switches have either been wrong from new. Or at some stage past, someone has fiddled with the wiring.
Resulting in the situation where if enough condensate was formed. The drainlines, condensate reservoir and evap coils would become saturated. At which point the surplus Water would be blown around under the modular floor. Causing the water sensing cabling that runs under the flooring to detect
an alarm situation and set off the "water alarm within the BMS system.
Sadly the BMS alarm does not switch off the faulty chiller so the fans will run on compounding the situation.
I have recommended that the water alarm control software be linked into the no run permit signal to each chiller for obvious reasons!
Also just for good measure the humidifier tank overflow is connected to the float reservoir as well!
Thank You Grizzlyhttp://www.refrigeration-engineer.com/forums/images/icons/icon14.gif

[The Viking]

You never get the IT guys to agree to cutting the run signal.

In their world their beloved servers will catch fire if the room temperature is ever allowed to rise above 21 C.

(And they don't really understand the concept of water damage, as long as it's below server level)

[Grizzly]

You never get the IT guys to agree to cutting the run signal.

In their world their beloved servers will catch fire if the room temperature is ever allowed to rise above 21 C.

(And they don't really understand the concept of water damage, as long as it's below server level)

There stands the voice of experiance!
Have you also noticed how the cavlier installation of "Blade Servers" is creating unbalanced and unstable systems, where equilibriam once prevailed?
Grizzly http://www.refrigeration-engineer.com/forums/images/icons/icon14.gif

[The Viking]

Please don't use bad language on this forum.

Those Ba###rds are able of kicking out up to 16 kW per rack!
And so far I never experienced a customer asking for advice (about A/C issues) before upgrading to these monsters.