Exhaust Airflow Measurement

(Optional with all Units)

1.Close the disconnect switch or circuit protector switch that provides the supply power to the unit's terminal block 1TB1 or the unit mounted disconnect switch 1S14.

WARNING

Hazardous Voltage!

Disconnect all electric power, including remote discon- nects before servicing. Follow proper lockout/tagout procedures to ensure the power can not be inadvert- ently energized. Failure to disconnect power before ser- vicing could result in death or serious injury.

HIGH VOLTAGE IS PRESENT AT TERMINAL BLOCK 1TB1 OR UNIT DISCONNECT SWITCH 1S14.

2.Turn the 115 volt control circuit switch 1S1 and the 24 volt control circuit switch 1S70 to the "On" position.

3.Open the Human Interface access door, located in the unit control panel, and press the SERVICE MODE key to display the first service screen. Refer to the latest edition of the appropriate SAHF-PTG manual for CV or VAV ap- plications for the SERVICE TEST screens and program- ming instructions.

4.Use Table 4-1 to program the following system compo- nents for operation by scrolling through the displays;

Exhaust Fan

Exhaust Dampers (100% Open, if applicable) Fresh Air dampers (100% Open)

Variable Frequency Drive (100%, if applicable) RTM Occ/Unocc Output (Default)

5.Once the configuration for the components is complete, press the NEXT key until the LCD displays the “Start test in __Sec.” screen. Press the + key to designate the delay before the test is to start. This service test will begin after the TEST START key is pressed and the delay desig- nated in this step has elapsed. Press the ENTER key to confirm this choice.

WARNING

Live Electrical Components!

During installation, testing, servicing and troubleshoot- ing of this product, it may be necessary to work with live electrical components. Have a qualified licensed electri- cian or other individual who has been properly trained in handling live electrical components perform these tasks. Failure to follow all electrical safety precautions when exposed to live electrical components could result in death or serious injury.

6.Press the TEST START key to start the test. Remember that the delay designated in step 5 must elapse before the fans will begin to operate.

Unit Start-Up (Continued)

7.With the exhaust dampers open and the exhaust fan op- erating at full airflow capability, measure the amperage at the exhaust fan contactor 1K17. If the amperage ex- ceeds the motor nameplate value, the static pressure is less than design and airflow is too high. If the amperage is below the motor nameplate value, static pressure may be too high and CFM may be too low. To determine the actual CFM (± 5%);

a.Measure the actual fan RPM

b.Calculate the Theoretical BHP Actual Motor Amps X Motor HP Motor Nameplate Amps

Use Tables 4-3 & 4-4 to calculate a new fan drive if the CFM is not at design specifications.

8.Press the STOP key at the Human Interface Module in the unit control panel to stop the fan operation.

TraqTM Sensor Airflow Measurement

(Optional with all units equipped with an economizer)

1.Open the Human Interface access door, located in the unit control panel, and press the SERVICE MODE key to display the first service screen. Refer to the latest edition of the appropriate SAHF-PTG manual for CV or VAV ap- plications for the SERVICE TEST screens and program- ming instructions.

2.Use Table 4-1 to program the following system compo- nents for Economizer operation by scrolling through the displays;

Supply Fan (On)

Inlet Guide Vanes (100% Open, if applicable) Fresh Air dampers (Selected % Open)

Variable Frequency Drive (100% Output, if applicable) RTM Occ/Unocc Output (Unoccupied)

Outside Air CFM Setpoint

Outside Air Pre-Heater Operation (if applicable)

3.Once the configuration for the components is complete, press the NEXT key until the LCD displays the “Start test in __Sec.” screen. Press the + key to designate the delay before the test is to start. This service test will begin after the TEST START key is pressed and the delay desig- nated in this step has elapsed. Press the ENTER key to confirm this choice.

4.Press the TEST START key to start the test. Remember that the delay designated in step 3 must elapse before the fans will begin to operate.

5.With the unit operating in the "TEST MODE", the amount of outside air flowing through the traq sensor can be view by switching to the "STATUS MENU" screen "OA CFM.

6.Scroll to the "ECONOMIZER ENABLE/ECONOMIZER POSITION" screen by pressing the "NEXT" key and read the corresponding damper opening percentage (%).

7.Press the STOP key at the Human Interface Module in the unit control panel to stop the unit operation.