Setting Up A 12-Volt Connection - Truma Combi eco Installation Instructions Manual

– Use a cable tie tool to fix the cable ties.
Fig. 37

Setting up a 12-volt connection

The Combi furnace features reverse polar-
ity protection. Even in case of an improper
connection, the furnace can resume operation
once proper polarity has been established.
Power supply units must reliably provide an
output voltage between 11 V and 15 V. The
AC voltage ripple must not exceed 1 Vpp.
• The furnace must be connected to the RV's
fused electrical system (central electrical sys-
tem: 10 A).
• The power supply cable must have a diameter
of at least:
– 2 x AWG 14 (2 x 2.1 mm²) up to
16 ft length (5 m)
– 2 x AWG 12 (2 x 3.3 mm²) up to
19 ft length (8 m)
– For lengths > 19 ft (8 m), contact Truma
Service.
Drops in voltage in the supply line must be
taken into consideration.
• Connect the negative wire to the central
ground. If connected directly to the battery,
the positive wire and the negative wire must
be fuse-protected:
– Use fully insulated flat connectors only ow-
ing to the risk of short circuit concerning
connections (Fig. 35 – 40 and Fig. 35– 41).
– Size of spade connectors:
0.25 in. x 0.032 in. (6.3 x 0.8 mm)
TE - PIDG FASTON 250 series
• DO NOT connect any other load to the 12 V
connection.
Connecting the room temperature
sensor
• Insert the connector cable into the connec-
tion (Fig. 35 – 46). Polarity is not a concern.
Connecting the CP plus control panel
• Fully insert the connector cable into one of
the connections (Fig. 35 – 47, 35 – 48).
Setting up a 120 V connection
(Combi eco plus and Combi comfort plus
models with electrical heating elements only)
Use a 3-pole NEMA electrical plug (5-20P) to
connect the furnace to the power supply.
Hazard due to electrical current!
Improper installation can cause property dam-
age, personal injury or loss of life.
• Installation must be performed by a
licensed electrician as per national/local
regulations.
• The customer must install a NEMA 5-20P
socket:
– Make sure that the socket is connected by
means of a ground fault circuit interrupter
(GFCI) with all-pole disconnection (contact
clearance of at least 0.14 in. (3.5 mm)).
– Make sure that the socket is grounded and
fused at 20 A as a minimum.
– Also ensure that L (phase conductor) and N
(neutral conductor) are connected properly.
Fig. 38
• 120 V lines must be kept completely sepa-
rate from 12 V lines.
• Secure all lines by means of clamps.
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