Installation, Operation & Maintenance Manual
IM-895
6
Unit Installation
(Electrical Connections)
1. Installation of wiring must conform with local building codes, or in the absence of local codes, with the National Electric Code
ANSI/NFPA 70 - Latest Edition. Unit must be electrically grounded in conformance to this code. In Canada, wiring must comply
with CSA C22.1, Part 1, Electrical Code.
2. Job specific wiring diagrams are furnished with each unit. A permanent laminated diagram is located on the inside of the
electric control cabinet door. The unit is supplied with a labeled terminal strip for ease of wiring. Refer to this diagram for all
wiring connections.
3. Make sure all multi-voltage components (motors, transformers, etc.) are wired in accordance with the power supply voltage.
4. The power supply to the unit must be protected with a lockable fused or circuit breaker disconnect switch. If a disconnect
switch is not supplied with the unit, the field-supplied disconnect must have adequate ampacity and must be installed in
accordance with Article 430 of the National Electric Code, ANSI/NFPA 70.
5. The power supply must be within 5% percent of the voltage rating and each phase must be balanced within 2% of each other.
If not, advise the utility company.
6. The factory-supplied door switch must be installed so that the unit energizes and de-energizes as part of the process.
7. External electrical connections to be installed include:
• Supply power connection (115, 208, 230, 380, 460 or 575 volts).
• Connection of thermostats and remote monitoring panels that may be supplied (115 and/or 24 volts - refer to unit wiring
diagram).
• Connection of door switch (shipped loose).
1. Electric shock hazard. Could cause severe injury or death. Failure to bond the frame of this equipment to the building electrical ground
by use of the grounding terminal provided or other acceptable means may result in electrical shock. Disconnect electric power before
servicing equipment. Service to be performed only by qualified personnel. Make sure power is turned off and locked in the OFF
position.
2. All appliances must be wired strictly in accordance with the wiring diagram furnished with the unit. Any wiring that is different from the wiring
diagram could result in a hazard to persons and property.
3. Any original factory wiring that requires replacement must be replaced with wiring material having a temperature rating of at least 221°F
(105°C).
4. Spark testing or shorting of control wires by any means will render the control transformer inoperative. DO NOT allow this to happen
as it IS NOT covered under the warranty.
WARNING
1. Ensure that the supply voltage to the appliance, as indicated on the serial
plate, is not 5% less than the rated voltage.
2. Since a failure of the unit may affect the proper operation of other fuel
burning equipment in the building, the unit shall be electrically interlocked
to open balancing air inlet dampers or other such devices.
CAUTION