Electric Heat Kit Installation Manual

4. Installing the Electric Heat Kit
4.1 Read the safety precautions section of the Multi-Position Air Handler
before installing the electric heat option.
Remove the entire enclosure from the packaging and inspect for any possible damages. The following images in the
installation section do not represent all electric heat options. Depending on the model, the number of circuit breakers might
vary as well as the size of the enclosure. Always check the model number on the package and enclosure before
continuing. Before continuing with the installation, be sure all power to the equipment that is being worked on is
disconnected. Failure to do so could result in injury or death.
4.2 Setting proper external static pressure.
NOTE
Best design practice to assure adequate airflow requirements.
During electric heater operation the fan is defaulted to high speed to help assure adequate airflow
. To maintain adequate
airflow required for electric heater operation, it is recommended that an additional 0.20 in. WG static pressure drop be
added to system ductwork design when using the electric heat kit.
Examples:
When air handler is set for 0.50 in. WG static, the maximum external static pressure for ductwork should not exceed 0.30
in. WG.
When air handler is set for 0.80 in. WG static, the maximum external static pressure for ductwork should not exceed 0.60
in. WG, etc.
Electric Heat Kit
Specifications are subject to change without notice. 11 © 2018 Mitsubishi Electric US, Inc.