Page 4 – Van Air Systems MHL3-MHL50 User Manual
Page 4
Van Air Systems MHL-Series Desiccant Air Dryer Operations and Maintenance Manual
Page 4
SECTION 4 INSTALLING THE DRYER
4.1
LOCATION
DO NOT INSTALL DRYER IN AN ENVIRONMENT OF
CORROSIVE CHEMICALS, EXPLOSIVE GASES, OR AREAS
OF HIGH AMBIENT TEMPERATURE CONDITIONS.
Install the dryer indoors. Dryers are not meant to be installed
outdoors exposed to the weather. If the dryer must be installed
outdoors, it must be in a weatherproof enclosure that provides
for proper temperature control.
When mounting, allow 2.5 inches above unit for tower removal
and replacement.
The dryer may be installed in a vertical or horizontal (laying
flat) orientation. Installation on its side may contribute to
possible shuttle valve shifting problems.
4.2
ELECTRICAL CONNECTIONS
Before wiring, check the dryer nameplate for electrical
characteristics. Standard electrical characteristics are 115
volt, 1 phase, 50/60 Hz. Models operating on 230 volts are
available.
IMPORTANT! No overload protection is provided in the dryer
and unit should be wired into a protected circuit.
IMPORTANT! When installing electrical service to this
machine, comply with the National Electrical Code as well as
state and local building codes.
NOTE: Dryer cycle timer has infinite memory capacity. Dryer
may be wired to compressor pressure switch or auxiliary
contacts to allow dryer to start and stop with compressor or
machine tool. Contacts must supply same voltage and phase
as dryer requires.
A six foot power cord is installed as standard on the dryer. The
cord on the115V dryers has a plug. The cord on the 230V
dryers does not have a plug. The control box and bulkhead
fittings are NEMA 4 rated.
•
If a NEMA 1 installation is desired:
A.
You may simply plug the power cord into a standard
outlet.
- or -
B.
Use standard flexible conduit, and follow the
instructions for installing liquid-tight conduit below.
Use only flexible conduit as installing rigid conduit
may damage polycarbonate control box. Connect to
inlet power terminal strip with 18 gauge stranded
wire only.
•
If maintaining the NEMA 4 installation is
desired:
A.
Cut off the plug and use a NEMA 4 gasketed
bulkhead fitting suitable for .180” diameter power
cord to enter a NEMA 4 rated junction box.
- or -
A.
To use flexible liquid-tight conduit and stranded 18
gauge wire:
1.
Remove clear cover from control box.
2.
Loosen nuts on (3) bulkhead connectors and
push an inch or two of each of the electrical
cords back into the control box to allow slack to
pull out solid state timer board. Remove four
screws holding solid state timer board and pull
back gently to expose the “power in” terminal
block. With small screwdriver, loosen wire
clamps on terminal block and disconnect power
cord wires.
3.
Remove (1) backing nut from inlet power cord
bulkhead fitting and remove power cord and
bulkhead fitting.
4.
Enlarge existing hole to proper size to install
your own liquid-tight conduit fitting. Use only
flexible liquid-tight conduit as installing rigid
conduit may damage polycarbonate control box.
5.
Connect to “power in” terminal block with 18
gauge stranded wire only.
BACK SIDE OF
TIMER BOARD
POWER IN
TERMINAL BLOCK