electricalperson
Senior Member
- Location
- massachusetts
here is what we are doing.
the HVAC contractor wants us to wire the damper at the top of the shaft and a fan inside the elevator room. there is a vent between the room and the shaft
the damper at the top is powered close and spring open. when it looses power it opens
the hvac guy gave us a UPS to install to power just the fan only. he DOES NOT (for reasons unknown) want the damper on the ups.
here is what he wants to do. when the fire alarm goes off he wants the damper at the top of the shaft to open (loose power) and the fan to kick on.
in normal operation a thermostat inside the elevator room will control the damper and the fan. if it gets too hot the damper opens and the fans kick on to remove the heat.
here is a diagram i drew up im not an artist so dont make fun of me. :grin: what does everyone think?
the thermostat in the drawing is in heat mode so therefor the damper is shut at the top and no fan is on. when it switches to cool it drops the power to the fan, turns on the relay for the fans thats fed off of the UPS circuit. hopefully this makes sense.
when i say street and street neutral i mean power thats not on the UPS circuit. the relays are shown in there non powered locations.
the HVAC contractor wants us to wire the damper at the top of the shaft and a fan inside the elevator room. there is a vent between the room and the shaft
the damper at the top is powered close and spring open. when it looses power it opens
the hvac guy gave us a UPS to install to power just the fan only. he DOES NOT (for reasons unknown) want the damper on the ups.
here is what he wants to do. when the fire alarm goes off he wants the damper at the top of the shaft to open (loose power) and the fan to kick on.
in normal operation a thermostat inside the elevator room will control the damper and the fan. if it gets too hot the damper opens and the fans kick on to remove the heat.
here is a diagram i drew up im not an artist so dont make fun of me. :grin: what does everyone think?
the thermostat in the drawing is in heat mode so therefor the damper is shut at the top and no fan is on. when it switches to cool it drops the power to the fan, turns on the relay for the fans thats fed off of the UPS circuit. hopefully this makes sense.
when i say street and street neutral i mean power thats not on the UPS circuit. the relays are shown in there non powered locations.