Nibe VPD 150 User's And Installer's Manual page 8

Component positions
PF1
PF3
UA1
UA2
XL3
Pipe connections
XL3 Connection, cold water, blue (28 mm)
XL4 Connection, hot water, red (22 mm)
XL36 Connection, supply line from HP, white (22 mm)
HVAC components
UA1 Submerged tube for hot water sensor (display)
UA2 Submerged tube for hot water sensor (control)
8 Chapter 3 | For the Installer
XL36 XL4
VPD 150
PF1
PF3
UA1
UA2
XL3
VPD 300
Miscellaneous
PF1 Rating plate
PF3 Serial number plate
Designations in component locations according to
standard IEC 81346-1 and 81346-2.
XL36
XL4
VPD 150, 300