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Perimeter Zone sequence of operation.
Heating.
- On a drop in temperature below the heating set point of the
primary zone control thermostat, the cold supply air control damper will close
(a minimum can be set for fresh air requirements).
- The hot supply air control damper will begin to open and will
adjust to maintain a maximum down stream static pressure. The recommended
static pressure is .25"w.g.
The static pressure is field adjustable
 .
- Hot supply air (>80 degrees F.) will flow to the Vari-Flow
diffusers. A cooling / heating change over sensor in the neck of the Vari-Flow
diffusers will change the Vari-Flow diffusers to the heating mode of operation.
The
Vari-Flow diffuser dampers will position themselves to the field adjustable
volume for constant volume heating. The heating volume adjustment of each Vari-Flow
diffuser will be set to maintain individual heating comfort levels.
- The control thermostat is placed in the area of extreme for the
exposure. This is typically the area that requires heating and cooling first
and is satisfied last. The area with the zone control thermostat is called the
"control zone". The diffusers in the "control zone" will be constant volume
diffuser(s). This is done so that there are not two temperature controls in for
the same zone. As the exposure starts to approach the control thermostat
heating set point, the hot supply air control damper will begin to modulate the
volume of hot air to maintain the set-point temperature.
NEXT: Perimeter Zone sequence of operation
-Cooling
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