ARID-Dry MS-1200 Manual

3rd edition edited 6/27/17
MS-1200
DESICCANT DEHUMIDIFIER
INSTALLATION, OPERATION, AND MAINTENANCE INSTRUCTIONS
5931 Ford Court
Brighton, MI 48116
810/229-7900
[email protected]
www.ctrdh.com

Table of Contents
Subject Page Number
Read this Manual ............................................................................................................................1
Principle of Operation ......................................................................................................................1
Machine Set-Up ..............................................................................................................................1
Operating Instructions......................................................................................................................2
Controls............................................................................................................................................3
Maintenance Instructions ..............................................................................................................7-8
Spare Parts List................................................................................................................................9
Wiring Schematic ..........................................................................................................................10
Unit Outline …………………………………………………………………………………………………11

READ THIS MANUAL
This manual is provided for the MS-1200 dehumidifier so the user can gain a thorough
understanding of the proper set-up, operation, and maintenance. This dehumidifier is built
around tested engineering principles and has passed a thorough inspection for quality of
workmanship and function. A thorough understanding of the set-up, operation, and
maintenance of this equipment will allow it to provide maximum performance and
reliability.
PRINCIPLES OF OPERATION
The MS-1200 is a self-contained desiccant dehumidifier designed to efficiently remove
water vapor from the air. A portion of the desiccant rotor is exposed to the “process” air
effectively adsorbing moisture while the second portion of the rotor is exposed to heated
“reactivation” air effectively removing the adsorbed moisture. This process is done on a
continuous basis, providing constant dehumidified process air.
MACHINE SET-UP
Carefully remove the machine from its shipping carton.
Thoroughly inspect the machine for shipping damage. Should any damage be found,
report the damage to the freight company immediately.
Carefully place the machine on a level surface within the space to be dried.
Connect 10” hoses to the process inlets and outlets as required for the drying project.
Connect 10” hoses to the reactivation inlet and outlet as required for the drying project.
CAUTION- Do not pinch or kink the hoses. Blockage of the hoses will result in reduced
airflow and moisture removal capacity.
Check to ensure the machine is turned “off” prior to connecting power. Circuit breakers
are provided in the control enclosure. Check that they are switched “on” once power is
applied.
Connect an appropriate power cord and locking connector to the flanged inlet receptacle
provided at the rear of the machine. The cord should be connected to 220vac power with
either a 30a breaker or fuse with proper grounding for operation at “low”, 50a breaker or
fuses for operation at “high”.
1

OPERATION
Machine operation is fully automatic and requires no adjustments to airflow or other
primary functions.
A “POWER ON” lamp is provided to indicate that power is applied to the machine.
A “RUN” lamp is provided to indicate that the unit is operational. This lamp will be
illuminated when the “ON-OFF” switch is in the “ON” position.
Position the “HIGH/LOW” switch to match the appropriate power supply (50a High, 30a
Low).
Position the “HUMIDISTAT”switch to “BYPASSED”.
Turn the “ON-OFF” switch to the “ON” position. The machine will start operating. At this
point, both fans, reactivation heaters, and rotor drive will be operational.
If humidity control is desired to prevent over drying, a flanged receptacle is provided for
a remote humidity sensor. Connect the appropriate plug and humidity sensor with dry
contacts only-DO NOT APPLY VOLTAGE TO THIS CIRCUIT.
Position the “HUMIDISTAT” switch to “CONTROL ON”. The reactivation fan, heater, and
drive circuit will now cycle on and off from the humidistat input.
An hour meter is provided to track time of operation for to aid in scheduling inspection
and maintenance.
2

CONTROLS/ELECTRICAL
The controls in this machine are UL listed and provide for automatic operation and all
required protection of the machine components. Access to the control panel is via the
control cover located on top of the machine.
Air flow is accomplished using internal motorized impellers for process and reactivation
air. The process fan will operate any time the “ON-OFF” switch is in the “ON” position.
The reactivation air fan, heaters, and drive motor will operate when the “HUMIDISTAT”
switch is in “BYPASSED” or via humidity control when the switch is in the “CONTROL
ON” position.
A fractional hp gear motor drives the desiccant rotor.
Self-regulating PTC heater elements provide the “heat source” for reactivation.
MAINTENANCE
This machine is designed for minimal maintenance and years of trouble free service.
Clean the exterior of the machine with a damp cloth and mild soap if necessary.
DO NOT use a garden hose or pressure washer to clean this machine!
Occasionally inspect internal components for loose fasteners or damage from handling.
Inspect the flanged power inlet, connector, and cord for damage.
Check to ensure all access panels are in place and secure.
3

Air Inlet Filters Process: 12x24x2” pleated
React: 10x10x2” pleated
Filter access is accomplished by removing filter access covers for both the process and
reactivation filter.
Inspect filters regularly and replace if dirty. Regular air filter maintenance is critical to
extending the life of the desiccant rotor and moisture removal efficiency.
Keeping filters clean is the most important long term maintenance on this machine!
In dusty or dirty environments, the filter replacement interval will be greatly reduced. The
hour meter provided can be used to establish a filter replacement interval.
Motorized Impellers (blowers)
The motorized impeller motors provided in this machine require no maintenance. They
are sealed and permanently lubricated.
4

Desiccant rotor drive system
The rotor drive system consists of a fractional hp gear motor, timing pulley, timing belt,
and spring tensioner. The gear motor is sealed and permanently lubricated. Check the
motor fasteners and timing pulley to be secure. Inspect the timing belt for cracks, tears,
or abrasion. The tensioner should keep slack form the belt with light tension.
Rotor Seals
Periodically inspect the rotor seals for damage, tears, or gaps.
5

Reactivation Electrical Heaters
The heating elements are self-regulating PTC type and require no maintenance.
Heating surfaces of element are “live” conductors.
DO NOT TOUCH ELEMENTS WITH POWER APPLIED!
Unit dolly wheels
The bearings in the dolly wheels are pre-lubricated and require no maintenance.
6

SERVICE *
*Service of this machine should be performed by qualified personnel only.
Should questions arise, please contact Controlled Dehumidification at the number on the
front of this manual.
This machine is equipped with full perimeter service covers on both sides of the machine
for easy access for inspection, maintenance and service.
Note:
The process filter access cover must be removed prior to removing the service access
cover.
Process and React Fan Replacement
Disconnect power to the machine
Disconnect the fan wire spade terminals and remove the 3 hex nuts attaching the
motor/motor plate to the support studs.
Slide the assembly out of the machine.
Remove the fan from the mounting plate and install the new fan onto it.
Reverse removal procedure for installation.
Rotor Replacement
Disconnect power from the machine.
Remove the drive belt from the tensioner roller to slack it.
Remove the two ¼-20 machine screws from the center of dividing panels at each face of
the rotor.
Carefully slide the rotor from the machine, using the belt to pull it.
The rotor shaft and top and bottom spacers will be loose.
Remove them as soon as they clear the dividing panels. They will be re-used.
Remove seal/drive bands from the perimeter of the rotor. They will be re-used.
Perimeter Seal Replacement
Verify length of new seals by wrapping around rotor, allowing for 1” of overlap.
Trim the ends of one edge of the seal with a small radius, overlap by 1-1/4” and staple
overlap in two places.
Prepare a second seal with the overlap opposite direction of the first.
Install new seals loosely on the rotor, overlap tabs pointing in direction of rotation, flush
with the face so they do not protrude.
Install the seal/drive bands around the rotor, on top of the seal, fingers pointing toward
each other.
Tighten the clamping screws so that the bands are snug, but not tight.
Install rotor, shaft and spacers with the rotor positioned so that the gap between the rotor
and rotor panel are even all the way around.
Tighten the cap screws securing the rotor shaft to the dividing panel.
Press the perimeter seals and drive bands toward the rotor panels, working around the
perimeter until the seals are uniformly cured toward the panels, approximately ½” of the
seal/clamp on the rotor.
Apply a bead of Silicone RTV to the joint where the inner edge of the seal, band, and
rotor perimeter band meet. Allow to cure prior to placing the rotor in service.
7

Dividing Seal Replacement (4 ea.)
Disconnect power from the machine.
Remove the screws attaching the seal retention strips and seals to the dividing panels.
Cut the new seal material to match the original seal length and end profile (left and right).
Install the new seal with retention strip and screws.
Drive Belt Replacement
Disconnect power from the machine.
Remove the two ¼-20 machine screws from the center of dividing panels at each face of
the rotor.
Shift the rotor position off to one side to clear the center shaft of the divider panel.
Carefully slip the belt through the perimeter seal on top of the rotor, past the center shaft,
spacers and around the perimeter of the rotor.
Position the rotor and shaft back into place and tighten the cap screws through the
dividing panel.
Drive Motor Replacement
Disconnect power from the machine.
Disconnect the spade terminals on the motor wire leads.
Remove the drive belt from around tensioner pulley and pulley.
Loosen the set screws in the drive pulley and remove it from the motor shaft.
Remove the 4 screws attaching the motor and remove the motor.
Reverse procedure to install.
Dolly Wheel Replacement
Drill a small hole (1/4-3/8”) in the center of one of the push nut caps retaining the wheel
axle in the dolly.
Use a center punch and hammer to drive the shaft out of the cap.
Slide the shaft from the dolly frame, noting position of the wheel spacers.
Install new wheels by inserting the axle and spacers as required, pushing the axle
through the far side of the frame.
Using a block of wood to support the installed push cap, lightly tap the new cap securely
onto the axle.
8