Specifications

TROU BLE SHOOT ING

1. Checkout requires a handheld multimeter, 9V battery, a 5.6k ohm ¼ watt resistor, a 1.2k ohm ¼ watt resistor, a jumper

wire with ¼" quick connect terminals, and the 620 ohm resistor that is factory-installed across terminals SR+ and SR.

The terminal names below reference the economizer controller. Use the following flowcharts for to diagnose unit.

a. Disconnect power to the unit.

b. Jumper P to P1 (factory installed jumper is normally present).

c. Remove outdoor air enthalpy sensor from terminals SO+ and SO and install the 1.2k ohm resistor.

d. Put 620 ohm resistor across terminals SR+ and SR (factory installed 620 ohm resistor is normally present and

can be used).

e. Put 5.6k ohm resistor across T and T1.

a. Turn (EXH Set) Exhaust fan Setpoint potentiometer fully CCW.

b. Turn (Min Pos) Minimum Outside Air Damper potentiometer fully CCW.

c. Turn (DCV Max) Demand Control Ventilation Maximum potentiometer fully CW.

d. Turn (DCV Set) Demand Control Ventilation Setpoint potentiometer fully CCW.

e. Turn enthalpy potentiometer to "D".

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