Greenheck Fan ERH-55, ERH-45, ERH-90, ERH-20 manual Fan Rpm, Energy Recovery Wheel, Coils

Check pulleys and belts for proper alignment to avoid unnecessary belt wear, noise, vibration and power loss. Motor and drive shafts must be parallel and pulleys in line (see FIGURE 16).

FAN RPM

The adjustable motor pulley is preset at the factory to the customer specified RPM. Fan speed can be increased or decreased by adjusting the pitch diameter of the motor pulley. Multi-groove variable pitch pulleys must be adjusted an equal number of turns open or closed. Any increase in fan speed represents a substantial increase in load on the motor. Always check the motor amperage reading and compare it to the amperage rating shown on the motor nameplate when changing fan RPM. Access these components through the labeled access panels.

All access doors must be installed except the control center door. To measure the fan rpm, the blower door will need to be removed. Minimize measurement time because the motor may overamp with the door removed. Do not operate units with access doors/panels

WRONG

WRONG

WRONG

CORRECT

open or without proper ductwork in place as the motors will overload.

FIGURE 16

ENERGY RECOVERY WHEEL

CAUTION: See **WARNING** on page 1 and 11

For the ERH-20 and ERH-45, open the access door marked "Energy Wheel Cassette Access". UNPLUG the wheel drive motor and remove the metal spacer. Then pull the cassette out halfway as seen in FIGURE 17.

Note: For the ERH-55 and ERH-90, the energy recovery wheel does not slide out due to its size and weight. There is ample room inside the unit to perform energy recovery wheel servicing.

Turn the energy recovery wheel by hand to verify free operation. Check that the air seals, located around the outside of the wheel and across the center (both sides of wheel), are secure and in good condition. Replace cassette into unit, plug in wheel drive, replace access door and apply

power. Observe that the standard and high flow wheelFIGURE 17 rotates freely at about 60 RPM.

If wheel does not rotate or rotates too slowly, remove the

cassette (following the instruction on page 16). Air seals, which are too tight, will prevent proper rotation of the energy recovery wheel. Recheck the air seals for tightness. Air seal clearance may be checked by placing a sheet of paper, to act as a feeler gauge, 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 cassette through the wheel center. Tighten the screws so the air seals tug slightly on the sheet of paper.

COILS

Leak test thermal system to insure tight connections.

12