Heat Reclaim

[NANOTECH]

What should be the cut in temp. and cut out temp on the heat reclaim valve, water valve, and the condenser split valve?

[jackal]

Heat reclaim is used to give people comfort so run it off a normal thermostat and kick it in when the space needs heat.
Water valve? I assume you mean to control condenser head pressure? You can set it to maintain 90 to 100 degrees F.
Condenser split valve? Not sure what control you're talking about here.

[icemeister]

You'll have to give us some additional info on what type of heat reclaim you've got to answer that one.

What do you mean by water valve? Hot water reclaim?

The condenser split is usually set up for 50ºF CI and 55ºF CO (ambient temperature).

[crackertech]

:ditto:We need more info please.

[NANOTECH]

New account has 3 old Hill Racks all have Danfoss AKC-25 controlers with analog and digital boards. The low temp rack has a 3 way valve on the discharge line. One direction goes to the condenser coil the other goes to the hot water tank that supplies the meat cutting room and the other goes to a heat reclaim coil mounted in a FourSeasons unit on the roof. The one going to the condenser is labled split, wich i am assumming they are only using half the condenser when the outside air temp. drops below a ? predetermined temp. It appears they are using this heat reclaim for humidity control durring the winter but I do not know how to configure it for proper operation!?

[jpsmith1cm]

Be careful in setting this up.

A split valve acts differently than a heat reclaim valve.

The configuration will mostly be controlled by the store's requirements.

I normally set hot water reclaim to cut in at 130 and out at 140.

For air heat reclaim for heating purposes, I set it between 71 and 73, again depending on the store's requirements.

You may also need to have a pressure switch that locks out the heat reclaim if the pressure drops too low, too.

[NANOTECH]

There is also a control mounted in the control pannel called Atron! It has a sensor mounted to the drop leg and seems to be controling a solenoid valve (Hot Gas) into the top of the reciever!!?? Anyone know sequence of operation and what board and point it uses????

[icemeister]

This old thread will tell you a bit about the Attron, but as far as how it interfaces with your rack, I have no idea.

http://hvac-talk.com/vbb/showthread.php?t=89060

[jpsmith1cm]

Good old Parasystems.....

Yep, Just changed a compressor out on one today.

The Attron is a surge receiver controller.

When there are bubbles in the sightglass, it will feed hot gas into the Surge receiver to push out some more refrigerant.

[Phase Loss]

and in order for its hot gas to push liquid out of the surge vessel, you will have a A8 Hold Back valve in the condenser drop leg to make sure the discharge pressure is above the surge vessel pressure.