Steffes 1003 - Manual (Page 12)

ELECTRICAL CONNECTIONS
Line voltage connections for direct wired room heating units
Heaters that are designed for direct wired connections are equipped with knockouts for installation of the
electrical wire. This wiring can be installed with flexible conduit or by installing the electrical cable directly
into the heater. If installing electrical cable directly into the heater, be sure this cable is protected and not
prone to physical damage.
Direct wired heaters can only be connected with one branch circuit. Conductors used for the connection of the
heater must be rated for a minimum of 75
O C. To determine the correct wire size for the heating unit being
installed, refer to the Unit Identification Label located on the right side of the heater. (See Figure 10. Table 2
will also provide information on conductor sizing.)
Field wiring entering the heater must be routed so that it will not interfere with the heater’s
damper control system. Never install Class II (low voltage) wiring or any wiring for that
matter in a line voltage area unless it is rated for line voltage.
Line voltage connections for cord connected, plug-in room heating units
120V cord connected room heating units must only be
used with receptacles that are of the groundingtype
and suitable for the load of the heater. See the Unit
Identification Label on the lower right side panel of
the heater to determine correct circuit size. (See
Figure 8 for cord and receptacle requirements.)
The room heater's cord has a plug as shown in Figure 8A. An adapter, as shown in Figure 8B, is
available for connecting three blade grounding type plugs to two slot receptacles. The green
grounding means extending from the adapter must be connected to a permanent ground, such as a properly
grounded outlet box as shown in Figure 8C. This adapter should not be used if a three slot grounded recep-
tacle is available.
Heating element (brick core charging) control wiring connections for all room heating units
The charging of the heater is capable of being controlled on-peak via low voltage wiring, a wireless power line
carrier signal, or with a time clock. Since the heater is capable of being fed with only one line voltage branch
circuit, line voltage control of the heater's charging is not possible. The power line carrier transmitter and time
clock are optional control devices. If either of these methods of control are desired, they must be specified at
the time of order of the heater to be included with the shipment of the heater.
If using low voltage control, all connections to the room heater's control circuit board must be routed through
the low voltage raceway using the factory installed wiring. Class II (low voltage) wiring should never enter
the line voltage compartment of this room heating unit. (See Figures 13 and 14.)
Never install any wiring in a line voltage area unless it is rated for line voltage.
If a Power Line Carrier Transmitter is being used for control of the room heating unit, low voltage connec-
tions to the heater are not necessary. Installation instructions for this method of control are provided with the
power line carrier control system.
If using a time clock for peak control of the heater, the time clock is connected to the heater via low voltage
wires. An installation instruction sheet is included with the time clock. Please refer to these instructiosn for
installation of this device inside the heater.
Installing Installing Installing Installing Installing The Heater The Heater The Heater The Heater The Heater
(cont'd) (cont'd) (cont'd) (cont'd) (cont'd)
11
3
adapter
grounding means
Fig 8B
grounding screw
grounded outlet
box
Fig 8C
FIGURE 8
grounding pin
Fig 8A
CAUTION
CAUTION