Onan MDJF Series Operator's Manual And Parts Catalog page 15

Output Lead Markings: Generators are marked T l , T2, etc.
These identifying marks also appear on the wiring diagram.
Voltage Selection on Reconnectible Single Phase Genera-
tors: These models are reconnectible for use as a 120/240
volt 3 wire; a 120 volt 2 wire or 240volt 2 wire power source
(Figure 12).
Load Connections: Refer to the figure which illustrates
the load connections for the output shown on your set's
nameplate.
CAUTION
Do not use existing neoprene impeller
water pump lor hot water side ol cooling
system. Heat or soluble oil (in many rust inhibitors and
anti-lreezes) will damage the impeller. Always connect
the neoprene impeller pump to the cold water side. Use
a centrifugal metal impeller water pump (Onan #132-0110
or equal) in the hot water side. Drive it with a belt from
the set's power take-oll.
Spec A through C: Use an expansion tank in the hot water
side.
Delta Generator: Generator lead To is the generator center
tap between T l and T2. The To lead is normally not
grounded but can be grounded if required (Figure 12-B).
Single phase power at center tapped leg available up to
2/3 of full rated three phase power.
Discharged water leaves at heat exchanger and then to
exhaust system water inlet. Supply line connections are
the same as standard system (Figure 13). Refer to the
instructions for water supply line in this section.
F i l l closed cooling systems with clean, alkali-free water,
to the proper level. Add an approved rust inhibitor to the
coolant. If the coolant is anti-freeze, test it periodically.
HEAT EXCHANGER COOLING (Optional).
This is a closed cooling system commonly referred to as
fresh water cooling. Water circulated through the engine is
termed fresh . water, hot water, jacketed water, etc. Water
circulated through the heat exchanger only is called raw
water, sea water, cold water, discharged water, etc. This
system (with anti-freeze coolant) is recommended where
freezing hazards exist or where the owner wants to prevent
salt water problems.
Two conditions prevail: (1) Factoiy installed heat exchanger,
and (2) Customer installed Onan heat exchanger kit. Get
details from Onan.
Install a new zinc "pencil" (Figure 13) which screws into
fresh water outlet end of heat exchanger, every two months
or as inspection dictates.
l ^ ^ y ^ Q l J ^ j j Use high temperature cut-oil switch in
overheating.
1 the hot water side to protect unit Irom
14