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7
6 The power terminal board is equipped with box terminals sized to accept the correct size power
supply wire. Wire rated at 600V and 60°C is satisfactory for the heater branch circuit. Copper wire
is satisfactory for connection to the heater power terminal board box terminal.
7 Each heater has a wiring diagram affixed to the inside of the access door. Consult this diagram
before making any field connections.
8 Single or three-phase connections may be used with heater models DR-P275 and DR-P2100.
These units are factory wired for single phase operation. If these heaters are for use with three-
phase power, reconnect the wires as indicated in the wiring diagram attached to the heater.
9 For model DR-P275 and DR-P2100 (Figure 4a), move only the two wires marked “A1" and
marked
“
B1
”,
do not move or change any other wiring. The element lead wire marked“B1” which is
factory connected to the power terminal block (terminal located closest to the elements) must be
moved to terminal “B” on the three-phase terminal block.
10 The relay (contactor lead wire“A1") must be moved from the end terminal of the power terminal
block (terminal closest to the contactor or control terminal board) to the "A
”
terminal of the lower
terminal block (center terminal).
11 Electrical Accessories, either kits or factory-installed options, are shown connected by a dashed
line on the heater wiring diagram.
Note: We do not include the thermostat, we use a jumper wire to connect the thermostat terminals,
if you want to use a thermostat, you must remove the jumper wire, or not the thermostat cannot
work.
12 208/240 VOLT HEATER. The heaters are wired for 240V from factory. When heater is to be
connected to 208V supply, the transformer leads have to be inter changed. Inter change
transformer red and black primary leads (see wiring diagram on heater door). The white color
lead is the COMMON for the 40VA control transformer provided with these heaters.
2
DR-P350
14
M5X1.0
3
DR-P275
6
M6X1.0
4
DR-P2100
6
M6X1.0
5
DR-P3150
6
M6X1.0
6
DR-P3200
10
M6X1.0
Figure 4a - Wiring Connections for Single-Phase and Three-Phase
Power (DR-P275 and DR-P2100)
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