HVAC Controls iO-ESP-400 Installation instructions

iO- -400 Electronic Static Pressure ModuleESP
Installation & Operation
Instructions
INTRODUCTION
The iO- -400 is designed to work with any forced air zone control system capable of usingESP
conventional 24 Volt, 3-wire, floating point, motorized zone dampers. The module will handle up to four
zones. The same transformer used to power the zone control panel is also used to provide power to
the iO- -400. The module uses a iO- -400- pressure sensor that is installed in the mainESP ESP PS
discharge air plenum of the system.HVAC
SEQUENCE OF OPERATION
As zone dampers open and close, the iO- -400- Static Pressure Sensor continuously monitorsESP PS
the system static pressure. If the static pressure goes above the static pressure setpoint, the panel will
send a signal to all non-calling zone dampers to start to open to a point where the static pressure
setpoint is not exceeded. The small amount of air allowed to bleed into non-calling zones eliminates
air noise and assures proper airflow through the system. This also prevents coil freeze up andHVAC
high temperature issues. When all calls are satisfied, all zone dampers will go to the full open position.
INSTALLATION
1. Make sure all power is disconnected to the equipment and zoning panel.HVAC
2. Remove the iO- -400 cover and locate the panel on a flat, non-condensating, vertical surfaceESP
near
the zone control panel that will facilitate ease of access and wiring. Use appropriate anchors and
screws to secure the panel to the surface.
3. Run a 3-wire cable from each zone damper to the , C, terminals on the iO- -400.PC PO ESP
Strip 1/2” insulation off of each wire. Confirm the Power Close, Common and Power Open
wires and then push each wire into the terminals on the iO- -400. Repeat this step forESP
each zone damper in the system.
4. Run a length of 18-2 thermostat wire from the Power Close and Power Open terminals on the
zoning panel to the and terminals on the iO- -400. Make sure that the wire leads to thePC PO ESP
iO- -400 terminals have 1/2” insulation stripped off and then push each wire into the terminalESP
block. Repeat this step for each zone damper in the system.
5. Run a length of 18-2 thermostat wire from the 24 volt power terminals on the zoning panel to the
24 ‘R’ and ‘X’ terminals on the iO- -400. Make sure that the zoning panel 24 volt hot andVAC ESP
common match the ‘R’ Hot and ‘X’ Common on the iO- -400.ESP
6. Drill a 9/32” diameter hole in the middle of the main discharge air plenum prior to any zone dampers
or duct transitions. Take the iO- -400- Pressure Sensor probe and install it with the arrow inESP PS
the direction of airflow. Mount the iO- -400- Pressure Sensor in an accessible location withESP PS
the diaphragm in the vertical position. Use the supplied plastic tubing and attach one end to the
sensor probe and the other end to the ( ) high pressure fitting on the pressure sensor. RunP1+
conventional 8-2 thermostat wire from terminals 2 and 3 on the pressure sensor to the 1 andPS
2 terminals on the iO- -400 panel. The terminals are not polarity sensitive. (See wiringPS ESP
diagram on page 3)
1

iO- -400ESP TERMINAL AND LED DESIGNATIONS
5 AMP
DAMPER COMMON
FROM ZONE PANEL
NOT REQUIRED
ZONE 1 ZONE 2 ZONE 3 ZONE 4 PRESS SW 24VAC
PC
PO
PC
PO
PC
PO
PC
PO
PS1
2PS
R
X
ZONE 1
ZONE 2
ZONE 3
ZONE 4
PRESSURE
ABOVE
SETPOINT
POWER
ON
5 AMP
POWER
PC
C
PO
PC
C
PO
PC
C
PO
PC
C
PO
ZONE 4 ZONE 3 ZONE 2 ZONE 1
3-WIRE OUTPUT
1TO ZONE
DAMPER
3-WIRE OUTPUT
2TO ZONE
DAMPER
3-WIRE OUTPUT
3TO ZONE
DAMPER
3-WIRE OUTPUT
4TO ZONE
DAMPER
LED ON WHEN
DAMPER IS
OPEN
LED ON WHEN
STATIC PRESSURE
IS HIGH
LED ON
WHEN MODULE
24HAS VAC
MODULE
POWER
FUSE
ZONE DAMPER1
INPUT FROM
ZONE CONTROL PANEL
ZONE DAMPER2
INPUT FROM
ZONE CONTROL PANEL
ZONE DAMPER3
INPUT FROM
ZONE CONTROL PANEL
ZONE DAMPER4
INPUT FROM
ZONE CONTROL PANEL
24VAC
INPUT FROM
ZONE CONTROL PANEL
STATIC PRESSURE
SENSOR TERMINALS
MOUNTING HOLES
MOUNTING HOLES
2

TYPICAL WIRING DIAGRAM
5 AMP
DAMPER COMMON
FROM ZONE PANEL
NOT REQUIRED
ZONE 1 ZONE 2 ZONE 3 ZONE 4 PRESS SW 24VAC
PC
PO
PC
PO
PC
PO
PC
PO
PS1
2PS
R
X
ZONE 1
ZONE 2
ZONE 3
ZONE 4
PRESSURE
ABOVE
SETPOINT
POWER
ON
5 AMP
POWER
PC
C
PO
ZONE 4
PC
C
PO
ZONE 3
PC
C
PO
ZONE 2
PC
C
PO
ZONE 1
R
X
PC
C
PO
ZONE 4
PC
C
PO
ZONE 3
PC
C
PO
ZONE 2
PC
C
PO
ZONE 1
ZONE CONTROL PANEL TERMINALS
ZONE 1
DAMPER
ZONE 2
DAMPER
ZONE 3
DAMPER
ZONE 4
DAMPER
iO-ESP-400
3
32
FACTORY SET
0.35” W.G.AT
The iO- -400- pressure sensor should beESP PS
installed on a flat, surface so that the diaphragm is
in the vertical position. Use the 1/4” x 36” tubing
provided and connect one end to the ( ) highP1+
pressure fitting on the sensor. The other end of the
tubing should be connected to the plastic sensing
probe mounted in the main discharge air plenum
prior to any zone dampers or duct transitions. The
sensing probe is 3-1/8” x 1/4” O.D. Install and
mount the probe with the arrow in the direction of
airflow. The iO- -400- is factory set for 0.35”ESP SP
W.C. but is fully adjustable from 0.08” to 1.20” W.C.
PRESSURE
SENSOR
INPUT
WIRE TO
1 & 2PS PS
STATIC PRESSURE
SETPOINT DIAL

TEST CHECK AND STARTUP,
1. Verify that all component wires have been connected to the proper terminals and are secure.
2. Apply 24 Volt power to the zone control panel.
3. Confirm that the iO- -400 is on.ESP POWER ON LED
4. Put each zone thermostat in the position.OFF
5. With no calls taking place, the zone s on the iO- -400 should be on confirming that allLED ESP
dampers are in the open position.
6. Force a heating or cooling call from the zone one thermostat.
7. 1 on the -400 should stay on and 2, 3 and 4 s should go out.ZONE LED ESP ZONE LED
8. When the equipment is energized, the on the -400PRESSURE ABOVE SETPOINT LED ESP
will
come on if there is an increase in system static pressure. The iO- -400 will begin to modulateESP
open all zone dampers that are in the closed position until the pressure increase is relieved.
9. Repeat step 6 for each zone thermostat in the system.
10. Once Test, Check and Startup is completed, place all zone thermostats in their normal mode of
operation.
iO- -400 :ESP SPECIFICATIONS
Panel Dimensions:
Height: 8.0”
Width: 6.0”
Depth: 1.375”
PC Board Mounting:
Snap Track mounted to enclosure base
Operating Temperature Rating:
-40° F to 150° F
Operating Humidity:
5% to 90% non-condensingRH
Wiring:
18-gauge wire for all connections
TERMINAL DESIGNATIONS:
Panel Power
R 24Vac (Hot)
X 24Vac (Common)
Zone Panel Damper Inputs (4)
Power ClosePC
Power OpenPO
Damper Outputs (4)
Power ClosePC
C Common
Power OpenPO
Pressure Sensor
1PS
4iO-06-1250-071917
HVAC Controls
Indianapolis, IN 46237
www.iohvaccontrols.com
For Technical Support Call Toll Free: 866-225-5032