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many things could effect the plenum temp.

gas pressure
cfm: if to high temp rise will be lower

lake source heat pump can be very efficient. intallation should be done by a contractor that specializes in this type of unit or one with lots of experience with water source hp. depth of line in...

you made need a vacuum breaker on the steam piping
you would install a check valve on pipe that would not allow steam to escape but would allow air into piping after steam is shut off.

just stay away from carrier rtu and another piece of junk is tranes new pesedent rtu

thanks for the diagram. i actually found some and these strips are wired in the wye instead of delta also found some formulas that might be helpful

kW = cfm x delta T x 1.985/3413

cfm = kW x...

in regards to the post from boat racer. these boxes were bought without any controls. they have novar dampers that are also the equipment controler. the front end computer is called continuum. first...

i finally figured out the problem. found prints on building and it specified that the damper was to close when there is no need for cooling. also found some info on the boxes which sayed that the fan...

the wire diagram on the unit illistrated two different
types of strips. i would like to find a web site with examples of 3-phase strip wiring diagrams. the reason is i know the strips are bad and i...

i meant that i do agree with you about the entering air shuting down.

i don't agree with you about the entering air.
i work on another building with titus parallel and series fpb that has a min heat cfm and the parrallel boxes, the fan come on when there is a call for...

anyone have a wire diagram for three phase heat strips
there are six terminal posts for strips 460v

you are right. there is no di to prove fan is operating.
can't remember what type of controls it has. its something along the line of novar, not trane, siemens, johnson
while scanning the controls...

not leaving any coil cleaner on there to long are ya? i've seen that take'em out

this a vav system with dx roof tops. they supply 55 deg air to the vav boxes. the exterior boxes have parallel fan wich pulls air from the attic with common return.

there is no make up air, maybe...

the temp is measured by the contols. there are only two contactors in the box. one for fan(heat1 and one for heat2). yes there is a o-10vdc for the damper actuator at the supply air duct intering the...

what is a dc ramp? these controls have digital outputs for fan/heat stage 1 and heat stage 2 and it has an analog out for damper position. the only inputs seem to be a damper count(what ever that is)...

i am not sure what you are asking but the first stage is the fan in the box which pulls from the attic space with common return...

i am talking about the fan in the fan powered vav box. the system has rtu that supply 55deg air to all the fan powered vav boxes on the exterior of the building and to all of the vav boxes in the...

what are some common problems that would cause about 80% of the buildings exterior zones to be cold if all the fpb have electric heat and the ddc program shows to be calling for the. there is no air...

i have a bunch enviro-tec vfr fan powered vav boxes with electric strips that are not heating. found one box while looking at the ddc controls that was calling for stage 2 heat but not stage one,...

if this furnace is that old be carefull, i've seen a lot of cracked heat exchangers with units that old.
the fan is started in when the unit reaches a certain temp depending on the manufacturer....

i worked on a trane ahu with a time delay relay that mounted to the indoor fan relay. the ralay is bad and there was no wiring diagram or manuals. i've never seen a relay like this and thought it was...