Titus MAB IOM - Manual (Page 8)

MAB Installation Manual
IOM-MAB-00 08-15-04
8 of 9
Electric Heat
Preparation
Some items to consider prior to installing electric heat are
as follows:
•
Duct materials must be suitable for 250ºF operation.
See NFPA 90A and 90B pamphlet.
• Ensure ample room exists in the ductwork. Electric
heat must have at least 24 inches of straight duct
clearance before an elbow. If 24 inches are
unavailable, devices such as turning vanes or baffles
may be required.
Note: Electric heaters are incompatible with discharge
grille plenum.
Installation
Use the following information to install electric heat on
MAB models.
1. Position heater element section over the blower
wheel of the MAB unit.
Note: Heater baffle must be aligned with the
blower cut-off scroll. Heater should be rotated
180 degrees, if necessary to align. This
ensures proper blower discharge of air over
the heater element.
2. Attach electric heat plenum to MAB unit using #6 or
larger sheet metal screws.
Note: Ensure plenum is securely attached to
MAB unit only and not to blower wheel
extension.
3. Add insulation, if necessary to outside of plenum.
Warning: Do not insulate heater box.
Figure 10 shows MAB and electric heat components.
Air Handler Startup
Check the following items before startup.
•
Ensure all shipping bolts/screws are removed and all
other bolts and screws are tight.
• Never assume the voltage and phase on the unit
nameplate is the same as the motor wired.
• Check the alignment of the sheaves and ensure the
setscrews are tight.
• Check for proper rotation of the blower pulley.
Figure 10. Modular Unit with Electric Heater
Components
• Check motor phase and rotation.
− Exchanging two of the three leads at the unit
junction box can reverse three-phase motor
rotation.
− Exchanging leads inside the motor junction box
can reverse the rotation of single-phase motors.
Refer to the motor nameplate.
− Not all installations require a starter (some
motors utilize a contactor).
• Ensure all filters are installed. Perform filter check
with all doors and panels in place.
• Check the amperage draw of the motor. The
amperage draw should not exceed the nameplate
amps shown on the motor serial plate.