Well Traveled Living BLT-999W-2 - Manual (Page 10)

Carefully remove the unit from the box. Prior to installing
the unit, test to make sure the unit operates properly. To do
this, plug the unit's power supply cord into a conveniently
located 120-Volt grounded outlet.
UNPACKING AND TESTING FIREPLACE
10
This insert is for use on 120 Volts. The cord has a plug as
shown in (A) of Figure 3 given below. An adapter as shown
in (C) is available for connecting three-blade grounding-
type plugs to two-slot receptacles. The green grounding
plug extending from the adapter must be connected to a
permanent ground such as a properly grounded outlet
box. The adapter should not be used if a three-slot
grounded receptacle is available.
Figure 2
(A)
(B)
(C)
Grounding Methods
METAL SCREW
COVER OF GROUNDED
OUTLET BOX GROUNDING PIN
ADAPTER
GROUNDING
MEANS
NOT ALLOWED
IN CANADA
To disconnect heater, turn controls to off, then remove
plug from outlet.
GROUNDING INSTRUCTIONS