P3 - Vent; P4 - External Fan - Agilent Technologies TV 551/701 Navigator Notice De Mode D'emploi

17 Technical Information
Interconnections

P3 - Vent

Figure 18
This is a dedicated 24 Vdc connector to control the optional vent valve.
P4 – External Fan
Figure 19
This is a dedicated 24 Vdc connector to supply the optional external fan.
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P3-Vent
External fan
TV 551/701 Navigator User Manual / 87-900-934-01 (P)