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2
JOHNSON CONTROLS
FORM 100.50-NOM6 (1207)
AIR HOODS FOR ECONOMIZER
There are two (2) economizer outside air intake hoods
pro vid ed with the unit. The front and rear hoods are
made operational per the following instructions:
• Remove the screws holding the economizer hood
ship ping covers in place. Discard covers.
• Apply a bead of RTV sealer along the edge of
both hoods and each pivot joint to prevent water
leakage.
• Rotate the hoods out (each hood is hinged).
Secure the hoods with screws along the top and
sides.
• Seal any unused screw holes with RTV or by
re plac ing the screw.
AIR HOODS FOR FIXED OUTSIDE AIR
(UNITS WITHOUT ECONOMIZER)
The hoods must be installed per the above instructions.
The dampers may be adjusted by loosening the thumb
screw, turning the le ver to the desired position, and
retightening the thumb screw.
AIR HOODS FOR EXHAUST AIR
No hoods are required for the exhaust air outlet.
FIELD WIRING
Figure 2-8 shows the fi eld wiring to the Simplicity
control board. All fi eld control wiring is fi eld supplied
and installed.
Thermostat
A thermostat (4 stage cool and 3 stage heat) can be used
on CV and VAV units. On CV units the thermostat is
the primary means of control for the unit. The three
thermostat heating inputs connect to the P2 terminal
block on the Simplicity control board to terminals W1,
W2, and W3. The four thermostat cooling inputs connect
to the P2 and P3 terminal block on the Simplicity control
board to terminals Y1, Y2, Y3, and Y4.
The thermostat should be mounted on an inside wall
approximately 56” above the fl oor where it will not be
subject to drafts, sun exposure or heat from electrical
fi xtures or appliances.
Note that 24 VAC terminal (R) on terminal block P1
of the Simplicity control board must be used as the 24
VAC source for the input to the thermostat. Use of any
power source external to the controller will result in
damage to the Unit Controller.
Fan input
By closing a contact between terminal (R) and (G) on
terminal block P1 on the Simplicity control board the
supply fan can be turned on. This function is typically
used on CV units and is included with most room
thermostats.
Note that 24 VAC terminal (R) on terminal block P1
of the Simplicity control board must be used as the 24
VAC source for the input to (G). Use of any power
source external to the controller will result in damage
to the Unit Controller.
Space Sensor
A space sensor can be used in lieu of a thermostat as
the primary means of control on a CV unit. The space
sensor is connected to terminals (ST) and (GND) of
terminal block P8 on the Simplicity control board.
A space sensor with a 20,000 potentiometer can be
used to reset the space temperature set point. The
space temperature reset is connected to terminals (SSO)
and (GND) of terminal P8 on the Simplicity control
board.
When mounting a space sensor, it should be located on
an inside wall approximately 56” above the fl oor where
it will not be subject to drafts, sun exposure, or heat
from electrical fi xtures or appliances.
Shielded wire must be used that is
grounded at the control panel only.