Page
24 of 40
Number
PM820010
HVAC: SmartAir eHVAC System
On the recovery station and hose fittings, verify that
all valves are closed. The valves at the recovery sta-
tion must be set to the CLOSED position. The valves
at the quick-disconnect fittings must be set fully
counterclockwise (CCW).
2. Connect the recovery station to the system as fol-
lows:
a. Connect the blue hose to service port located on
the compressor-to-condenser line of the sleeper
outdoor unit.
b. Open (turn CW) the valves on the quick-discon-
nect fittings connected to the service ports on the
units.
3. Work may now begin on the air conditioning system.
P. Evacuating the System
Evacuating the Peterbilt EHVAC System Service
Procedures for R-134a
When any part of the refrigeration system has been
replaced or requires service, the system must be recov-
ered and evacuated. The system must be completely
evacuated of air and moisture before being charged.
After evacuation, the system vacuum should measure
between 750 and 1000 microns.
1. On the recovery station and hose fittings, verify that
all valves are closed. The valves at the recovery sta-
tion must be set to the CLOSED position. The valves
at the quick-disconnect fittings must be set fully
counterclockwise (CCW).
2. Connect the electronic vacuum gauge to the recov-
ery station, at the vacuum manifold, using a valve
and 'T' fittings.
3. Connect the recovery stations blue hose to the ser-
vice port located on the Peterbilt EHVAC system.
4. On the blue hose, open the valves on the quick-dis-
connect fittings (turn the knobs fully CW).
5. On the recovery station, set both hand valves to the
RECOVERY/VACUUM position.
6. On the recovery station, turn on main power switch
and press the VACUUM button.
7. After the low pressure gauge on the station shows
that vacuum is being established in the system, con-
tinue to operate the vacuum pump for fifteen min-
utes.
8. After 15 minutes, set both valves on the recovery sta-
tion to the CLOSED position, and observe low side
gauge for one minute. The gauge should not indicate
a rise of more than 2 inches-Hg. If the gauge rises
more than 2 inches-Hg in one minute, the system
has a leak, which must be repaired.
• The valve for the electronic vacuum gauge must
be in the closed position until instructed to open.
If the valve is open during system charging,
excess pressure may damage the electronic vac-
uum gauge.
9. If there are no leaks:
a. Set both hand valves on the recovery station to
the RECOVERY/VACUUM position and press
the VACUUM button.
b. Open the valve connecting the electronic vac-
uum gauge to the recovery station low side line.
Figure 16.
Service Recovery Connections
