Wiring
CLCH-SVX08C-EN
19
Wiring
Wiring Checklist
•
All field wiring must be in accordance with the National
Electric Code and state and local requirements.
•
All wiring (including low-voltage wiring) must be
copper conductors only with the insulation rated for
600 volts.
•
Refer to the nameplate located on the gas heater
section for the proper Input Voltage, Minimum Circuit
Ampacity (MCA) and Maximum Overcurrent
Protection (MOP) requirements for proper electrical
installation.
•
Input voltage must be /- 10 percent of specified
value.
•
Ground the supply power in the junction box to the
ground lead provided.
•
Do not route any wires through the heat exchanger
section unless the insulation is rated for 600˚F or
higher. Radiant heat from the heat exchanger will
damage wire insulation that is unsuitable for high
temperatures.
•
for power supply requirements.
Note:
Factory wiring routed through the heated part of
the cabinet has insulation rated for 600˚F.
High-Voltage Wiring
Wiring Entrance Locations
Indoor air handlers can accept conduit penetrations on
any side of the piping vestibule. For outdoor air handlers,
the recommended conduit entrance into the gas heat
section is through the floor of the piping vestibule.
Terminate conduits on the power junction box or gas
heater control panel as appropriate.
WARNING
Proper Field Wiring and Grounding
Required!
All field wiring MUST be performed by qualified
personnel. Improperly installed and grounded field
wiring poses FIRE and ELECTROCUTION hazards. To
avoid these hazards, you MUST follow requirements for
field wiring installation and grounding as described in
NEC and your local/state electrical codes. Failure to
follow code could result in death or serious injury.
WARNING
Hazardous Voltage!
Disconnect all electric power, including remote
disconnects before servicing. Follow proper lockout/
tagout procedures to ensure the power can not be
inadvertently energized. Failure to disconnect power
before servicing could result in death or serious injury.
NOTICE
Use Copper Conductors Only!
Unit terminals are not designed to accept other types
of conductors. Failure to use copper conductors could
result in equipment damage.
Table 7.
Power supply requirements
3:1 and 10:1 Burner Turndown Units
Gas Output (MBh)
200-1000
1250-2000
2000
3
Voltage/Ph
115-575/1
208-575/3
208/230/460/575/3
Minimum Circuit Ampacity (MCA)
less than 15
less than 15
1
19.71/17.9/9.0/7.2
Maximum Overcurrent Protection (MOP)
15
15
2
25/25/15/15
Note:
1
All except the 2000 MBh output, 208 volt, 3 phase unit. This unit will have a marked MCA of 16.1
2
All except the 2000 MBh output, 208 and 230 volt, 3 phase units. These units have a marked MOP of 20
3
2000 MBh with optional 3 hp exhaust motor required for long horizontal flue vents
20:1 Burner Turndown Units
Gas Output (MBh)
1250-1750
2000
2400
Voltage/Ph
208-575/3
208/230/460/575/3
208/230/460/575/3
Minimum Circuit Ampacity (MCA)
less than 15
17.3/16.0/8.0/6.4
20.9/19.0/9.5/7.6
Maximum Overcurrent Protection (MOP)
15
20/20/15/15
25/25/15/15
Note:
The MCA and MOP for the 2000 MBh with optional 3 hp exhaust motor will be the same as 2400 MBh.
