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Checkout and Troubleshooting
Checkout Procedure for Single Sensor
A. Make sure enthalpy sensor is connected to SO and +. The white
resistor must be placed on SR and +.
1. Turn enthalpy set point on Economizer Logic Module to "A"
2. With power connected, spray a small amount of envronmentally
safe coolant in upper left vent of sensor to simulate low enthalpy
conditions. (See figure 12)
B. Disconnect power at TR and TR1.
(Second enthalpy sensor connected to terminals "SR" and "+")
A. 1. Turn enthalpy set point on Economizer Logic Module past "D"
(full clockwise).
2. With power connected, spray a small amount of environmentally
safe coolant into upper left vent of sensor connected to SO and +
to simulate low outdoor air enthalpy. (See figure 12).
B. Spray small amount of environmmentally safe coolant in upper left
vent of return air enthalpy sensor connected to SR and + to simulate
low return air enthalpy.
w
Checkout procedure for Differential Enthalpy
SPRAY SMALL AMOUNT OF COOLANT INTO UPPER
LEFT CORNER VENT OF ENTHALPY SENSOR
CASE TO SIMULATE LOW ENTHALPY
FOR CHECKOUT.
ENTHALPY
SENSOR
ENVIRONMENTALLY SAFE
COOLANT, SUCH AS
ENVI-RO-TECH 1672-10S
INSTALLER'S GUIDE
Response
1) LED (light -emitting
diode) turns on within a
minute.
2) Terminals 2, 3 closed.
Terminals 1, 2 open
Terminals 2, 3 open.
Terminals 1, 2 closed.
1) LED turns off.
2) Terminals 2, 3 closed.
Terminals 1, 2 open.
1) LED turns off.
2) Terminals 2, 3 open.
Terminals 1, 2 closed.
S
M12163
page 9
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