Product manual

16 McQuay IM 782-4
Installation Guidelines
Electric Heat Section (Optional)
Optional factory installed electric heat section consists of open
coil duct heater mounted to the unit at the supply fan
discharge. Heat section includes heating coils and an electrical
control box with single point field power connection for heater
and supply air fan.
Factory provided field knockouts are located on the side of the
electric heat control panel for field power and control wiring to
pass through. A factory installed non-fused disconnect is
located in the electric heat control panel to disconnect power to
the supply air fan and heater components. All wiring must be
in conformance with the national electric code and local
restrictions.
Open Coil Duct Heater
• Complete with overload and thermal protection
• Includes fan interlock and air flow switch safety protection
• High quality, alloy nichrome wire [80%Ni / 20%Cr]
• High di-electric level ceramic insulators
• Screw terminals
Single Point Power
• Non-fused disconnect
• Electric heat is factory wired including contactors and fuses
per step and as required by UL. Refer to Figure and
Figure 26 for typical electric heat wiring diagrams
• Fan motor is factory wired including contactor or starter and
fuses as applicable
• Fused control transformer allows the heater and fan to be
sequenced by standard 24 volt thermostat
• Indoor control panel with tool access hinged door houses all
components
Quality Control
• Heaters are di-electrically tested for 1000V plus twice the
rated volts, or 2000V whichever is greater. The resistance of
each heater is measured and recorded and must be within 5%
of the rated value
• Every heater is checked during the production process and
as a final assembly
Figure 22: Heater Nomenclature
Figure 23: Destiny Unit with Left Hand Electric Heat
C M XX - XX - XX
Heater
Phases
Wattage
Voltage
Modular
Steps
Airflow
Removable Panel
for Full Access
9.50
2.25
3.00
Knockouts: Four Diameters
2.38, 1.62, 1.88, 1.00
Front
Electric Heat Matches
Destiny Fan Discharge
and Attaches Directly
to Destiny Unit
3.00
Left Hand Electric
Heat Shown
(Right Hand Optional)