AIR HOODS FOR ECONOMIZER
There are two (2) economizer outside air intake hoods provided with the unit. The front and rear hoods are made operational per the following instructions:
•Remove the screws holding the economizer hood shipping 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 replacing 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 lever 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 field wiring to the Simplicity control board. All field control wiring is field 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.
FORM
The thermostat should be mounted on an inside wall approximately 56” above the floor where it will not be subject to drafts, sun exposure or heat from electrical fixtures 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 2 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 floor where it will not be subject to drafts, sun exposure, or heat from electrical fixtures or appliances.
Shielded wire must be used that is grounded at the control panel only.
JOHNSON CONTROLS | 33 |
