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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 specifications for recycled refrigerant. Follow the SAE-J2211 recommended service
procedure for the containment of R-134a.
The unit includes a 3 cfm (85 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
efficient 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 specifications.
Technical Specifications
Voltage . . . . . . . . . . . . . . . . . . . . . . . . . 115V, 60 Hz
Operating Range . . . . 50° to 120° F (11° to 49° C)
Filter-Drier . . . . . . . . . . . . . . . 43 cu. in. spin-on type
Pump Free-Air Displacement
. . . . . 3 cfm (85 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 flow from vehicle A/C system
through unit; blue light indicates low-
side flow from vehicle A/C system
through unit.
Control Panel:
folds flat 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 filter-driers and
oil bottles).
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