Section 6, Wiring the Electrical System
6-2 Installation Manual for Oasis
®
SCH33™ HW Heating System
• The 12 VDC connections to the Oasis SCH33 control
board must be connected directly to the battery
(through a fuse). There should be no battery disconnect
switch between the battery and the Oasis SCH33
control board. This is to prevent the burner from being
shut down without first going through its appropriate
purge period. Without a proper purge period to cool the
combustion chamber, the internal components of the
Oasis SCH33 will become damaged.
• There are no switches on the control board or box that
disconnect the power to the heater and/or control board
once 12 VDC power has been supplied to the board.
• A properly-shielded power system is required for safe,
trouble-free operation.
6.3 Oasis SCH33 120/240 VAC
• The Oasis SCH33 is equipped with one 1500-Watt 120
VAC (North America) or one 1500-Watt 240 VAC
(Europe) electric immersion element. The connections
for the electrical supply are on the top access panel,
towards the back. The plate that covers the AC wiring
includes a wire strain relief and is labelled AC power.
• There are three, 14-gauge, stranded copper leads that
use standard AC color code (black – hot, white –
neutral, green – ground). These are connected using
standard 120/240 VAC electrical connectors and
terminals. These wires are to be connected to a switch
and from there to a separate AC circuit breaker. The
power supply wiring is secured to the AC cover plate
with the strain relief inserted back into AC connection
box the cover secured to the case.
• Power to the electrical heating element is provided
through a separate, appropriately rated, switch. It is
best to use a switch with indicator light to see when the
element is activated as shown in figure 6-1.
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