Pub. No. OM-A-10E — April 2004
13
PB SERIES HEAT REACTIVATED BLOWER
PURGE AIR DRYER INSTALLATION &
OPERATION
General
1.
Install dryer on a level base, indoors or under a
shed.
2.
During shipment flange and connecting bolts can
come loose. All bolts should be checked and
tightened as needed.
3.
Make sure when the piping is in place that no undue
stress is placed on dryer connections. Union joints or
flexible connections are recommended to relieve
stress. Also, properly support the pipes as needed
with hangers or brackets. Air piping must be
installed by an experienced pipe fitter.
4.
Equip dryer with inlet and outlet isolation valves and
a bypass valve for ease of servicing and start-up.
5.
Connect electric power to the dryer through a
properly sized fused disconnect switch.
6.
Reactivation exhaust may be piped away from the
dryer, making sure proper pipe size is used. Pipe
size should be increased by one size at the valve,
and one additional pipe diameter size for every ten-
foot run to reduce back pressure.
7.
ELECTRICAL CONNECTIONS:
Follow the
recognized local and municipal electrical codes. All
components must be load rated as approved by
NEC, NEMA, CSA and UL.
8.
During shipment, wire connections may become
loose. Per U.L. specification, torque screws inside
enclosure to 20 in-lbs.
9.
GROUNDING:
It is mandatory that the dryer be
grounded. Use an adequate ground with the
conductor sized to NEC.
10.
STORAGE:
In case of extended storage period
before the installation, follow these simple
procedures:
a. Seal or cover all the parts
b. Wrap the electrical enclosure
c. Wrap the mufflers
d. If the desiccant is shipped loose, store it inside to
avoid any rain or water damage.
e. Prior to start-up, check the heater element
resistance. Element (phase) to ground should
exceed the resistance value by 20 megohms. If
this value is not indicated, energize the heater at
low voltage to drive the moisture from the
element insulation. Remove the cover to vent the
moisture from the heater terminal enclosure.
11.
STEAM CONNECTIONS:
For units with optional
steam heat exchanger, the steam connections are
supplied as flanges for both inlet and condensate
return.
12.
WATER CONNECTIONS:
For units with optional
watercooled aftercooler, connect the water supply
and drain lines.
13.
BLOWER MOUNTING BOLTS:
Loosen the blower
mounting bolts to serve as riding pins only.
14.
BLOWER ROTATION:
When making electrical
connections, check the rotation of blower for proper
operation. Momentarily energize the blower to
check for the rotation. In case of reverse rotation,
disconnect the power and change two leads on the
blower starter to change the direction of rotation.
15.
LEAK TEST:
All the dryers are tested at the factory
for any leaks before shipment. An air leak could
develop during transportation or installation.
Pressurize the system and check for any leaks.
Start-Up Procedure
1.
Leave the power switch in the OFF position.
2.
Keeping the dryer outlet isolation valve closed,
slowly pressurize both the adsorbent chambers to the
line pressure.
3.
Check for any leaks in the system.
4.
Open blower outlet/throttling valve.
5.
Engage the blower starter to test the rotation
according to the direction-of-rotation arrow which is
affixed to the blower casing. (If incorrect switch any
two leads to reverse the rotation.)
6.
When the towers are at line pressure, turn the power
switch to the ON position.
7.
One inlet valve will close, and the chamber purge
valve will open and depressurize. This may take as
long as 10 minutes.
8.
When the blower motor turns off and the dry air
sweep begins, adjust the cooling flow pressure to the
recommended setting, and lock the valve locking
mechanism in place.
