Page
23 of 39
Number
SM001-300
HVAC: Idle Management System
does not operate, the problem is internal in the heater.
See Espar’s Airtronic
Installation, Troubleshooting, and
for complete heater diagnostics.
If the resistance level is not present or correct, check
across pins 5 and 7 on the back of the digital controller. If
you have the correct resistance here but not outside the
Idle Management System unit, you have a bad connec-
tion or a defective harness. If you do not have the correct
resistance here, your digital controller is defective.
O. Connecting the System
O-Ring/Line Service Only
NOTE
Refrigerant
lines
are
shipped
after
being
vacuumed.
To
service
the
o
‐
rings
and/or
lines
on
the
EHVAC
sys
‐
tem
you
must
(1)
recover
the
systems
refrigerant
charge,
(2)
replace
the
o
‐
rings
/
lines,
(3)
evacuate
/
leak
test
system
and
(4)
recharge
the
system
with
the
recommended
charge
from
Servicing the Evaporator and / or Condenser Unit
NOTE
Evaporator and condenser units are shipped with a
holding charge only. For proper system operation all
replacement units must be recovered and EHVAC sys-
tem recharged with the recommended charge from
Proper service procedure: (1) recover system refrigerant
charge, (2) replace unit, (3) recover holding charge, (4)
evacuate / leak test, (5) recharge proper refrigerant level.
WARNING!
Before doing any of the work below, be aware of the
dangers involved. Working with refrigerant could lead
to serious personal injury.
CAUTION
The Kenworth EHVAC uses PVE lubricant in the refrig-
erant system. PVE oils absorb atmospheric moisture
very quickly. Never leave PVE oil exposed to air for a
prolonged time. Tightly reseal the system after each
charge or service.
CAUTION
Do not add oil. Kenworth EHVAC uses special PVE oil
which is different than standard PAG oil in most AC
systems. Addition of PAG oil to the system will greatly
reduce performance and void Kenworth EHVAC war-
ranty.
NOTE
Although your service equipment may appear physi-
cally different from the equipment shown here, the
function of the equipment used to perform each service
procedure is similar. If you are performing these ser-
vice procedures using service equipment different from
that shown, refer to the manufacturer's instructions
supplied with that equipment.
Typical Equipment Hookup for Servicing the
Kenworth EHVAC System
1. Remove the protection cap from service port. The
Kenworth EHVAC system uses smaller lines than
conventional AC systems. In order to simplify the
installation and charging only one service port has
been given for the system.
Figure 16.
Service Equipment
1 – Low Pressure
Hose (Blue)
2 – High Pressure
Hose (Red)
3 – Recovery/
Recycling/
Charging Station
1
2
3
