XCI SmartZone SPC User manual

SmartZone
TM
SPC (Static Pressure Controller)
 Air Pressure Sensing Switch
 For use with POC and RPOC Dampers
 Adjustable Air Switch Set Point Range
GENERAL DESCRIPTION
The SPC is a static pressure switch designed to sense positive pressure
in the plenum for the purpose of controlling modulating bypass position.
The plated housing contains a diaphragm, a calibration spring and a
snap-acting SPDT switch. The barbed sample line connections located on
each side of the diaphragm accept flexible tubing. The enclosure cover
guards against accidental contact with the live switch terminal screws and
the set point adjusting screw. The enclosure cover will accept a ½"
conduit connection.
Pitot tube (air-probe) for mounting in plenum and 12 inches of flexible ¼”
I.D. poly tubing included with each SPC. Specifications
Mounting Mount with the diaphragm in any
vertical plane. (See Figure 3)
Set Point 0.05 ± 0.02" w.c. to 2.0"w.c.
Range
Field Adj. 0.07”w.c. to 2.0"w.c.
Operate Range
Field Adj. 0.04”w.c. to 1.9"w.c.
Release Range
Field Adj. 0.07”w.c. to 2.0"w.c.
Operate Range
Approx. Switching Progressive, increasing from
Differential 0.02 ± 0.01”w.c. at minimum set
set point to 0.1w.c. at maximum
set point.
Measured Media Air or combustion by-products
that will not degrade silicone
Maximum Pressure ½ psi (0.03 bar)
Operating -40ºF to 180ºF (-40ºC to 82ºC)
Temperature
Electrical 300VA pilot duty at 115 to
Rating 277 VAC, 15 Amps non-inductive
277 VAC @ 60Hz
Contact SPDT
Arrangement
Sample Line ¼” Barbed connectors for
Connections flexible tubing
Approval UL, FM, CSA, CE
Mounting
Select a mounting location which is free from vibration. The
SPC must be mounted with the diaphragm in any vertical plane
in order to obtain the lowest specified operating set point. Avoid
mounting with the sample line connections in the "up" position.
Surface mount via the two 3/16" diameter holes in the integral
mounting bracket. The mounting holes are 3-7/8" apart. (See
Figure 3)
Air Sample Connection
The SPC is designed to accept flexible tubing by means of
barbed 1/4” slip-on connections. A 12” piece of ¼” ID Flexible
tubing is included with the SPC as well as a Pitot Tube for
mounting in the plenum. Locate the sampling probe a minimum
of 2 feet downstream from the air source. Install the sampling
probe as close to the center of the airstream as possible. Do not
allow supply pressure to blow directly into the Pitot Tube.
Connect the provided flexible tubing to the High-Pressure Inlet
as shown in Figure 2.
Pitot Tube (Included)

IndoorUnitorSmartzoneEquipmentBlock
G C
 
Static C 
 
Pressure NO  CDamper
  
Controller NC    PCActuator
 
   PO
Figure 1 – Wiring Diagram
XCI Zoning 4315 Huron Avenue, Lubbock TX 79407 <> http://www.xcizoning.com
Specifications subject to change without notice. telephone [phone] <> fax [phone] P/N 220106-00
Fi
g
ure 2
–
Dimensions
Figure 3 – Mounting
Electrical Connections
Before pressure is applied to the diaphragm, the switch contacts on the SPC will be
in the normally closed (NC) position. This snap switch has screw top terminals with
cup washers. Wire according to Figure 1.
Modulating Bypass
Setup
With all zones calling (all
dampers open), make certain
the fan is in the highest speed
that will be used when the
system is running.
Turn the set screw clockwise
¼ turn each time until the
bypass damper motor is
obviously running closed. If
the bypass damper should
reverse and start opening turn
the set screw another ¼ turn
and repeat until the bypass
damper is closed. Next, slowly
turn the set screw counter-
clockwise until the bypass
damper motor starts to run
open. Immediately, turn the
set screw clockwise once
again until the damper motor
starts to close again.
The goal is to set the bypass
damper so that it is barely
staying closed when all zones
are open. This will cause the
bypass damper to open if
supply dampers close and the
plenum pressure goes up. As
dampers open and/or close
during operation, the static
pressure sensor will sense a
pressure change and make the
power open/power close
bypass damper move to
maintain the same pressure in
the plenum that was
established when all zones
were open.