User Manual

2
Introduction
RobinairNo.34788isusedonR-134avehiclesandisdesignedtobecompatiblewithexistingservice
equipmentandstandardserviceprocedures.ModelNo.34788isaUL-listed,single-passsystem
thatmeetsSAEspecicationsforrecycledrefrigerant.FollowtheSAE-J2211recommendedservice
procedure for the containment of R-134a.
Theunitincludesa1.5cfm(42l/m)Robinairhighvacuumpumpforfast,thoroughevacuation.The
compressorpullstheA/Csystemto0psig,thenworksinserieswiththevacuumpumptoachievehighly
efcientrecoveryandimmediaterecharge.Ifthesystemisnotopenedforservice,thereisnoneed
topulladditionalvacuum.Ifthesystemisopenedforservice,usetheunit’svacuumcycletoremove
airandmoisturefromtheA/Csystem.(Werecommendaminimum15-minutevacuum,orfollowthe
vehiclemanufacturer’sspecs.)Note: R-134a systems require special oils. Refer to the A/C system
manufacturer’s service manual for oil specications.
Technical Specications
Nominal Voltage . . . . . . 34788: 115V, 60 Hz
34788-I: 230V, 50/60 Hz
Utilization Voltage Range. . . . 34788: 104–127
34788-I: 200–250
Operating Range . . 50°to120°F(11°to49°C)
Filter-Drier . . . . . . . . . . . .43cu.in.spin-ontype
Pump Free-Air Displacement . . 1.5cfm(42l/m)
Dimensions . . . . . . . . . . .49"Hx34"Wx23"D
 (124.5cmx86.4cmx58.4cm)
Digital Display:visual
interface between operator
and machine.
Main Power Switch:supplies
electrical power to unit.
Manifold Gauges:
connect to vehicle A/C
system;showsystem’s
low-sideandhigh-side
pressure.
Flow Indicators:redlightindicates
high-sideowfromvehicleA/Csystem
throughunit;bluelightindicateslow-
sideowfromvehicleA/Csystem
through unit.
Control Panel:
foldsatforstorage.
Database Expansion Slot: an
optionalvehicledatabasewill
supplyinformationregarding
charge capacity by vehicle model.
Tool Storage Areas
(additionalstorage
onbacksidefor
extralter-driersand
oilbottles).