Carrier 62E specifications Start-Up, Energy Recovery Wheel, a62-383.eps, ERV Wheel Rotation

START-UP

Use the following information to check unit PRIOR to start-up.

CAUTION

Before turning the disconnect switch on, verify that the voltage being provided to the ERV unit matches the volt- age shown on the ERV nameplate. Failure to do so could result in equipment damage.

Unit Preparation — Check that the unit has been in- stalled in accordance with these installation instructions and all applicable codes.

Check all fasteners and set screws for tightness. Verify that all of the panels are in place and secure. Verify that any open- ings to the ERV cabinet are clear of foreign materials.

Internal Wiring — Check all electrical connections in the control box. Tighten as required.

Rain Hoods — The outside air hood will include alumi- num water entrainment filters, which should be in place prior to starting the unit.

Energy Recovery Wheel

DRIVE BELT — Turn the energy recovery wheel by hand to verify free operation. Inspect the belt, which drives the energy wheel rotation. Make sure the belt rides smoothly through the pulley and over the wheel rim.

AIR SEALS — Check that the air seals located around the outside of the wheel and across the center, on both sides of the wheel, are secure and in good condition. Air seals which are too tight will prevent proper rotation of the energy recovery wheel.

Air seal clearance may be checked by placing a sheet of pa- per, like a feeler gage, against the wheel face. To adjust the air seals, loosen all eight seal retaining screws. These screws are located on the bearing support that spans the length of the

a62-383.eps

cassette through the wheel center. Tighten the screws so the air seals tug slightly on the sheet of paper as the wheel is turned. Re-check the air seals for tightness after adjustment.

Replace the access door and apply power. Check that the wheel rotates freely. If the wheel does not rotate or is binding, remove the cassette and adjust.

For units with three phase power only: Remove the ser- vice door to make sure the wheel is turning in the same direc- tion as the sticker next to the motor shows. See Fig. 15. If the wheel is turning in the wrong direction turn, off the disconnect switch and have a qualified electrician swap any 2 of the power leads on the load side of the disconnect switch.

Airflow Settings and Adjustments — With the disconnect on, the display should show "ERV FAN SPEED" on the top line of the display. The bottom line of the display should show "OA=XXX EX=XXX" where the “X”s represent the blower output percentage for the outside air blowers and the exhaust air blowers.

NOTE: If any of the alarms are tripped, the LCD display will scroll between the alarms and the normal display.

To measure the airflow the ERV units have factory-installed airflow test ports, which allow the balancer of the job to easily measure the static pressure across the ERV wheel. The static pressure is measured on both the supply and return sides of the wheel. Take this pressure reading and match up the wheel dif- ferential pressure (Δ P) to pressure chart to display the cfm that is flowing through the ERV wheel. See Table 6.

To balance the airflow remove the small panel next to the control panel cover to access the user input controls. Press the push button and turn the knob clockwise to increase or counter- clockwise to decrease the outside air blower speed (use the test ports and charts described above to calculate cfm levels). Press the push button again to change the exhaust air blower speed. Press the button again to return to the main screen. Replace the user control cover when ERV cabinet is operating at the correct blower speeds.

Fig. 15 — ERV Wheel Rotation

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