Regular maintenance on an electric wall heater will prolong the life of the product and keep it operating safe-
ly. Heaters should be cleaned and inspected every 6 months. This guide will show in detail how to properly
clean and maintain your King electric wall heater. It will also show when parts (or perhaps the entire heater)
should be replaced. Listed below are step by step instructions for cleaning and maintaining the W and WHF
Series Wall Heaters.
WARNING:
Take extreme caution when working with electrical heaters. Turn off the electrical power to the
heater before removing the grill of the heater. Lock, tape or tag the circuit breaker so that the power cannot
be turned on accidentally while working on the heater. Failure to do so can result in serious electrical shock,
burns or possible death.
KING ELECTRICAL MFG. CO. · 9131 10TH AVE SOUTH · SEATTLE, WA 98108
w-whf.indd : 4/08
CLEANING & MAINTENANCE GUIDE FOR
W - WHF SERIES HEATERS
After the power is turned off remove the grill using a #2 square drive or a #2 Phillips head
screwdriver. Use the same tool to loosen the screw on the right and left to remove interior.
Clean grill before reinstalling.
To clean heater start by using a vacuum cleaner nozzle in the blow out mode. Point the nozzle at the
element from underneath as shown on the diagram. This will dislodge any contaminates caught on
the heating element. Compressed air blown on to the element works well also. If you have another
vacuum you can blow out from the bottom and suck the debris from the fan opening at the same
time which will minimize dirt and lint being blown into the room.
Use a soft bristled brush such as a paint brush to remove any contaminants from the fan blade. Spin the fan
by hand to make sure it spins freely. If it feels like the motor is binding add a drop of sewing machine oil.
Vacuum out any material in the chamber between the fan and heating element by placing the vacuum
nozzle into the fan opening. Be careful not to bend the fan blade because it could become out of balance if
deformed. The fan can be removed to gain more access to the heater interior by using a 3/32" allen wrench.
When done replace the fan in the same position on the shaft as before. Be careful not to bend the squirrel
cage because it could become out of balance if deformed.
Remove two screws from back of unit to free the blower element housing to complete the
rest of the cleaning.
The useful life of a W or WHF Series heater depends on the amount of use, environment and how often it is cleaned and maintained. Heaters operated beyond their useful
life of 5-7 years are more prone to problems. For example, when a motor slows due to wear or lack of cleaning it reduces the CFM and can cause the element to overheat,
tripping the limit control. It is much safer to
fi
x the cycling heater before the limit trips.