1
typical horizontal installation
typical downflow installation typical upflow installation
King Electrical Mfg. Company • 9131 10th Avenue South Seattle WA 98108 • (206) 762-0400 fax (206) 763-7738
KF and KFS Series Electric Furnaces
Installation Instructions
CAUTION: Turn off power source supplying the heater before attempting installation, maintenance or repairs. Lock or tag circuit
breaker or fuse panel door. Failure to do so could result in serious electrical shock, burns, or possible death.
It is
extremely important
to verify the electrical power supply is the same voltage as the heater being installed.
240 and 480 Volt heaters are
not interchangeable!
Powering a 480 Volt unit with 240 Volt supply wires will reduce the heater output by approximately 75% resulting in no motor
power. Powering a 240 Volt unit with 480 Volt supply wires will destroy the heater and voids all warranties.
CHECK
: Ensure blower wheel is free-turning and that element assemblies are in place. Be sure filter is in proper position and not torn or dam-
aged. Check that blower housing and motor have not separated from element compartment.
FIELD WIRING:
King furnaces come equipped with 60 Amp circuit breakers installed for protection of the furnace internal wiring only. They also
serve as a disconnection means when required. A 240 Volt single phase circuit must be brought to each circuit breaker in the furnace as shown in the
wiring diagram. The terminals are identified as L1-L2, L3-L4, L5-L6 and L7-L8. The kW size of the furnace determines how many circuits are required.
The furnace power and electrical rating table indicates how many circuits each model furnace requires, the size of the branch circuit protection at the
distribution panel and the wire size required from distribution panel to the furnace. Consult your local and national electric codes for answers to any
questions. All wiring used must be approved for a minimum of 75°C. NOTE: No wire may have more than 120 VAC potential to ground. This must
be checked on installation to avoid motor damage. Unit must be grounded by connection of groundwire from the distribution panel to the terminal
provided in furnace. When the line voltage terminal block option is specified for single strike see wiring diagram for wire size and circuit protection
requriements.
King furnaces can be installed with a minimum of 1 inch clearance for compact, space-saving installations in either vertical upflow, downflow or
horizontal position.
When installed in the downflow position the combustible floor base accessory must be used
.
NOTE:
The attached Underwriters Labratories label pertains to the furnace only. It does not cover any air cooler, condensing unit or air cleaner,
which may be used with the furnace. The optional QOU cabinets are designed for slip-in addition of an evaporator coil at a later date. Approval of the
complete air conditioning system requires compliance with local codes.
“
WARNING:
RISK OF ELECTRIC SHOCK. CAN CAUSE
INJURY OR DEATH. DISCONNECT ALL REMOTE ELEC-
TRIC POWER SUPPLIES BEFORE SERVICING.”
S
AVE
T
HESE
I
NSTRUCTIONS
DIMENSIONAL CLEARANCE
Cabinet sides
Cabinet front
Exhaust duct within
3 feet of furnace
Return air plenum
1 inch
0 inches
1 inch
0 inches
2007 KF-KFS.indd : 10/07
