DUAL DRYER SYSTEM
INSTALLATION/SERVICE
MANUAL (L31279)
®
DRYest Air Dryer Overview
The Haldex DRYest is a desiccant type dryer that
effectively collects and removes moisture, oil and
contaminants before they enter the compressed air
system. The DRYest provides filtered, moisture free
air to the brake system which reduces freezing and
corrosion of the components in the air system.
Anatomy
The DRYest contains three major parts:
Cartridge
Canister [1] with five stages of drying, Air Dryer Base [2]
and Valve Unit [3].
Cartridge Canister [1]
The
Cartridge Canister [1]
is where drying and
contaminant removal occurs in the air dryer. The
GeminiMDx Dual Dryer contains the Haldex patented
MTC+ cartridge design which has five stages of drying.
The desiccant cartridge is contained by the canister
and affixed to the dryer base with an o-ring, mounting
collar and four bolts.
Air Dryer Base [2]
The
Air Dryer Base [2]
connects the
Cartridge Canister
[1]
and the
Valve Unit [3]
. The base has connections
for the inlet, outlet and purge reservoirs. The base also
contains the following components:
• Safety Valve [2.1]
• Outlet Check Valve [2.2]
• Turbo-Protection Valve (TPV) [2.3]
• Heater Element [2.4]
Valve Unit [3]
The
Valve Unit [3]
attaches to the
Air Dryer Base [2]
with six screws and contains the purge valve. The
Valve
Unit [3]
has a control port for external air governor
connection and includes a muffler style or drain tube
style purge outlet.
Drying
Page 4
WET TANK
PURGE TANK
GOVERNOR
COMPRESSOR
OPTIONAL
PRE-TREATMENT
[1]
[2.3]
[2.4]
[2.2]
[3]
[2.1]
[2]
