G) Cooling Fans; H) Output Ammeter - NewMar PT-24-20W Installation & Operation Manual

G) Cooling Fan
To maximize the life of the internal components and to allow
continuous operation at full rating, the Phase Three Charger
employs two automatic integral cooling fans. The fans draw air
through the bottom of the unit and expel it out the top to improve
cooling and reduce the possibility of drawing in water drops (an
optional dripshield is provided for extra protection). These fans
operate whenever load and/or ambient temperature cause a rise
in the heat sink temperature. Their speed automatically increases/
decreases in response to load and/or ambient temperature
increases/decreases. Note: Under most circumstances, the fans will
be in operation when the charger is on. However, they may stop
completely under no load and/or ambient temperature conditions.
Fan Replacement
If a fan(s) fails to operate when the charger is on and a load is
applied, it may be in need of replacement. Replacement fans are
available from NEWMAR. (Specify part number 999-1208-0. Refer
to Replacement Fan with PCB connector.)
1) Disconnect the charger from the AC power source.
2) Referring to Photo 1, remove the top cover screw and the 2
panel screws as shown and carefully remove the fan panel.
Photo 1
Photo 3
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3) Referring to Photo 2A & 2B, unplug the 2 fan connectors noting
their orientation as shown. Note the orientation of the wires as
shown in Photo 2.
4) Invert the fan panel and remove the 4 screws securing the fans
as shown in Photo 3.
5) Install the new fans in the reverse order using the 4 screws and
refer to Photos 2 and 3 for orientation.
6) Plug in the fan connectors to the circuit board – the notch in the
fan connector faces upwards.
7) Replace the fan panel and secure it with the three mounting
screws.
8) Once unit is back in service, verify that the fans are blowing air
out of the unit through the vent slots in the fan panel. If the fans are
drawing air into the unit through the vent slots, they are installed
backwards and need to be corrected (repeating Fan Replacement
Procedure).
It is important that both fans are installed correctly or the charger
will not cool properly and overheat.

H) Output Ammeter

This will indicate total charging output current for all battery banks
connected.
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Photo 2A
Photo 2B