Oasys SEER 40 PLUS User manual
OASys OWNER’S MANUAL | www.oasysairconditioner.com | 800-537-2107
OASysTM
HYbRID Air Conditioner Owner’s Manual
with IDAC TECHNOLOGY
THERE’S A CHANGE IN THE AIR ®
...AND INYOUR ENERGY BILL
SEER 40 PLUS
OASys OWNER’S MANUAL | www.oasysairconditioner.com | 800-537-2107 1
INTRODUCTION ...............................................................................2
WARRANTY REGISTRATION......................................................3
GETTING STARTED ..........................................................................5
OPERATION...........................................................................................6
Thermostat Operation........................................................6
Operating Modes and Controls ........................................8
Operating Indicators............................................................10
General Use...........................................................................11
HOW OASys WORKS ........................................................................12
Principal of Operation .........................................................12
Water Consumption............................................................12
MAINTENANCE AND SERVICE..................................................13
General Troubleshooting.....................................................13
Winterization.........................................................................13
Requesting Service ...............................................................13
EXPLODED UNIT GRAPHIC........................................................14
INSTALLATION INSTRUCTIONS..............................................15
INSTALLATION CHECKLIST .......................................................15
SAFETY ....................................................................................................15
PLANNING THE INSTALLATION
Sizing .......................................................................................15
Selecting a Location for the OASys..................................15
Planning for Air Distribution ..............................................16
Service Connections............................................................17
Controls..................................................................................17
Water Hardness....................................................................17
Preparation for Mounting ...................................................18
UNPACKING AND INSPECTION
Parts Included........................................................................18
INSTALLATION
Cabinet Installation...............................................................18
Ducting....................................................................................18
Water Connections .............................................................18
OASys Service and Maintenance Drawings .............................19
TABLE of CONTENTS
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OASys COMPONENTS at a glance
WARNING – TO REDUCE THE RISK OF FIRE, ELECTRIC SHOCK, OR INJURY TO PERSONS,
OBSERVE THE FOLLOWING:
A. Installation work and electrical wiring must be done by qualied person(s) in accordance with all
applicable codes and standards, including re rated construction.
B. When cutting or drilling into wall or ceiling, do not damage electrical wiring and other
hidden utilities.
C. More than one disconnect switch may be required to de-energize the equipment for servicing.
___________________________________________________________________________
UL File E309793 Vol. 1 Sec. Gen. Page 3 Issued: 2007-04-02
INTRODUCTION
The OASys is a highly efcient, environmentally benign, and low maintenance cooling system. Because
of the unique nature of the OASys compared to conventional refrigerant air conditioners, a thorough
reading of this manual is highly recommended to assure that you benet from its comfort and energy
advantages.
“OASys” stands for Outdoor Air System. Instead of re-circulating indoor air OASys delivers 100% out-
door air, ltered through a water saturated media. And instead of compressing a gas to achieve cool-
ing, the OASys provides cooling by evaporating water using a unique two-stage process. The following
features show why the OASys is an entirely new class of air conditioner:
• 80% reduction in energy consumption (EER 40+)
• Two stage cooling results in lower air temperature, less humidity than single stage evaporative
coolers, and superior comfort
• Variable speed operation is provided by a three speed motor.
• Single blower and dual pump design means fewer moving parts, less maintenance, and lower
operating cost.
• Intelligent controls enable the unit to precisely maintain water quality, reducing maintenance and
conserving water.
• Easy access to all components simplies maintenance and repairs.
To begin using your OASys immediately, read Getting Started. To fully understand how to operate OA-
Sys, read the Operations section. To learn the principals of operation, refer to the sections General Use
and How OASys Works. To assure reliable, efcient operation of OASys for many years, refer to Main-
tenance and Service.
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OASys WARRANTY REGISTRATION
Please return by mail to:
attn: Russ Waters
Speakman Company
P.O. Box 191
Wilmington, DE 19899-0191
or
Go to www.oasysairconditioner.com/techinfo.html to download a llable PDF
and return by e-mail to: info@oasysairconditioner.com
OASys Serial Number _________________________________________________________
Customer Name _____________________________________________________________
__________________________________________________________________________
Customer Address Street _______________________________________________________
City, State and ZIP Code _______________________________________________________
Phone Number (optional)_______________________________________________________
Email Address (optional)________________________________________________________
Can we contact you to check on the status of your OASys? ❑ Yes/ ❑ No
Would you like a free Speakman high performance Eco Shower Head
to reduce water consumption versus standard shower heads? ❑ Yes/ ❑ No
For OASys updates and additional products please see our website:
www.oasysairconditoner.com
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GETTING STARTED
THESE INSTRUCTIONS will allow you to start using your OASys immediately.
To fully understand how to benet from its features, it is important that you read the Operation section.
• Insure power is connected.
• Insure water supply is connected and turned on.
• Your HVAC installer should check to make sure that the oat arm is properly aligned to the indicated
sump water level. This oat signals the solenoid inlet valve to introduce more water into the sump. If
it has become misaligned in shipment it can cause the unit to introduce more water than is necessary.
This water will not leak or cause damage since it goes out the overow discharge but it is to a certain
degree unnecessarily wasteful.
• Press On/Off button- power light will come on.
• Use the Mode Key to select the Auto Cool mode. Display will show “AC”. Auto Cool mode instructs
the OASys to achieve the Set Temperature. Note: as the OASys nears the Set Temperature the fan
speed will decrease- this programming maximizes energy savings and prevents the unit from going on
and off at high speed.
• The Display normally shows the Room Temperature. The Display changes to Set Temperature for 4
seconds if the arrows are used or if a signal is received from the remote transmitter. Use set button
arrows on the thermostat to select the desired Set Temperature or use the remote transmitter.
• The OASys will then commence operation and will automatically go through the following steps;
Solenoid Valve will open and the sump will ll with water, after 4 minutes the circulation pump will turn
on and the heat exchanger and direct media will wet out, after two minutes the fan will come on and
the unit will begin to supply cool conditioned air. Note: a total time of 6 minutes will elapse before cool
conditioned air begins to circulate.
• If the cooler fails to operate as described in the Sequence of Operation section of this manual, refer to
Maintenance and Service.
FOR MAXIMUM COMFORT and efciency, always use the Auto Cool mode. Because OASys uses so little
energy, setting the thermostat to maintain the temperature at 72-75° will assure that the house is
comfortable during the hottest part of the day, while costing only pennies per day. Setting the thermostat
lower during sleeping hours will also improve daytime comfort by precooling the “mass” of the house.
Because cooler air is delivered during nighttime hours, nighttime cooling efciency is very high.
THE OASYS INTRODUCES a continuous supply of fresh conditioned outdoor air. Unlike conventional
air conditioners which recycle stale indoor air the OASys must have an outlet to avoid pressurizing the house.
Provide outlets where you want the conditioned air stream to ow. Outlets can be as simple as open windows
or doors or can be consist of installed up-ducts to the attic. Cooling the attic will signicantly reduce the heat
load on the rest of the house. Often overlooked but quite effective outlets are replace dampers.
NOTE: When you rst start up the OASys unit you may notice a slight odor. This odor results from the
Celdek direct cooling media and is common to all sophisticated evaporative coolers that use this high quality
material. The odor will disappear within a few hours of use. If the odor is problematic use the thermostat to
ll and drain the sump several times to condition the direct media and the heat exchanger.
It is also possible to add a scent agent of your choice at any time either by spraying directly into the intake air
stream or by adding a few drops to the sump water.
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MODES
• Modes are the types of actions the OASys can perform.
CONTROLS
• Controls are the way the Modes are set or programmed.
INDICATORS
• Indicators allow the OASys unit to tell the user what Modes and settings have been chosen.
GENERAL FEATURES OF THE THERMOSTAT
The Thermostat has following general features
• Set Point temperature range from 61ºF to 86ºF
• Timer setting in Hours (if selected from the Thermostat) or
Hour/Minute (if selected from the Remote Control) to turn system on/off.
• Visual indication of the system operation indicated on Thermostat
• Various modes of operation
Explained below under the heading Modes of Operation
Please also refer to the diagram of the Controller and Thermostat shown in Figure 1
OPERATION
FIGURE 1. CONTROLLER and THERMOSTAT
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There are two types of OASys Modes: Operations Modes and Self-Maintenance Modes
OPERATIONS MODES ARE AS FOLLOWS:
• Fan Only
• Manual Cool
• Auto Cool
FAN ONLY:
• Only Fan motor works
• High, Medium or Low Fan speed can be selected with the transmitter or Fan Speed key.
Display will indicate F1, F2 or F3 depending on the speed selected, with F1 indicating
lowest and F3 highest fan speed.
MANUAL COOL:
• Fan speed can be changed to Low, Medium or High
• Circulation Pump can be switched On/Off
• Dump Pump can be Switched On/Off
AUTO COOL MODE:
• The OASys selects a fan speed depending on the differential between Room Temp and Set Temp.
Use the Mode button to select AC. Then use the Fan button to select a constant fan speed
(F1, F2 or F3) or select FA to instruct the unit to choose the optimal fan speed to reach set
temperature.
• In FA as the Room Temp goes above the Set temp startup sequence will be
a. Solenoid Valve will Open
b. 4 minutes later Circulation Pump turns on
c. 2 minutes later the Fan Motor starts
• Low, Medium, High or Auto Fan (FA) Speed can be selected.
• Fan Speed change takes place only if Circulation Pump is On
• In FA setting the OASys unit will select the optimal fan speed according to the following pro-
gramming:
IN CONDITIONS IN WHICHTHE ROOM TEMPERATURE IS INCREASING:
Room temp Fan Speed
Set temp Low
Set Temp+ 2ºF Medium
Set Temp+4ºF High
IN CONDITIONS IN WHICHTHE ROOM TEMPERATURE IS DECREASING:
Room Temp. Fan Speed
Set Temp+4ºF High
Set temp +2ºF Med
Set Temp Low
• If the Room Temperature falls 2ºF below the Set Temp:Circulation Pump will turn Off and the
OASys will go into Dry Out cycle- the fan will run at low speed for 4 minutes to dry out the
Direct/Indirect Media before going in to the Standby State.
OASys MODES
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OASys MODES continued
SLEEP MODE:
• Sleep Mode is selectable in Auto Cool Mode only. Sleep LED glows to indicate the Sleep Mode
selection. In this mode Set temperature will increase 1ºF every hour up to 2 Hrs.
OASYS SELF-MAINTENANCE MODES
PURGE CYCLE MODE:
• This mode is automatic but can be programmed.
• If the OASys has not started for 4 hours the Dump Pump will come on for 4 minutes which will
empty out the sump to prevent biological growth.
• The 4 hour automatic setting can be changed in steps of 2 hours from 2-12 hours.
• When this Purge Cycle starts the inlet valve will close and remain closed till the OASys is re-
started to provide cooling.
• To Adjust the Timing of the Clean Mode:
1. Press the Program Key on the Thermostat once.
2. Display will show P1. Adjust the time by UP/Down Keys
3.Time Period between 2 hours and 12 hours can be selected for Purge Cycle.
DRY OUT CYCLE:
• When the Set Temperature is achieved the Circulation Pump will stop while the fan will continue to
run for four minutes at medium speed. This will dry out both the indirect and direct media and will
prevent bacteriological growth.
CLEAN OUT CYCLE:
• Periodically the OASys will refresh the circulation water to prevent the build-up of hardness
minerals that can degrade the effectiveness of the evaporative media.
• During this mode the Dump Pump will automatically empty the unit while the Fill Valve is open
and the Circulation Pump is on. This will “wash” the evaporative media and will purge accumu-
lated dirt and minerals.
• This mode will last for 4 minutes.
• The period when this mode turns on can be programmed.
• Please consult your HVAC contractor to determine the optimal Clean Out frequency. The more
often the unit goes into the Clean Out Cycle the longer the Indirect and Direct media will last
before they require replacement. However, frequent Clean Out Cycle use will consume more
water. The highest setting is only required in areas that have high mineralization of the water
supply.
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CONTROLS
The OASys can be controlled using either the Keys on the Thermostat or the optional InfraRed Remote
Control:
THERMOSTAT CONTROLS. A beep sound is heard when any key is pressed.
• POWER: Switch the OASys on or off.
•UP: Increases the Set Temperature. Also used to adjust the Timer.
• DOWN: Decreases the Set Temperature. Also used to adjust the Timer.
• MODE: Changes the mode to Fan Only, Manual Cool or Auto Cool.
• FAN:This key changes the Fan speed to High, Medium or Low.
• TIMER: This key selects the Timer. Up/Down keys are used to adjust the Timer value.
• SLEEP:This key selects or de-selects the Sleep Function.
• PUMP:To switch On/Off the Circulation Pump in Manual Mode.
• DUMP:To Switch On/Off the Dump Pump in Manual Mode.
• PROGRAM: To Adjust the time for the Purge Cycle- will show S1 (2-12Hrs.)
INDICATORS
There are two types of Indicators on the OASys, LED Indicators and the Display.
LED INDICATORS
There are 6 LED lights on the Thermostat to indicate the following:
• AUTO COOL:To indicate the Auto Cool mode selection.
• SLEEP:To indicate the Sleep mode selection
• TIMER:To indicate the timer selection
• PUMP:To indicate that the Water Circulation Pump is On
• FILL: To indicate that the OASys ll valve is working
• POWER:To indicate that 120 volt AC power is reaching the OASys unit
DISPLAY:
• The Display normally shows the Room Temp up to 99 degrees Fahrenheit
• The display changes to Set Temperature for 4 seconds if any signal is received from the Receiver
or from the Remote Controller.
• Shows the modes “Fn” (Fan),“CL” (Cool) or “AC” (Auto Cool), if the mode key on receiver
board is pressed.
• Shows the fan Speed “F1” (Low), “F2” (High) , “F3” ( High) or “FA” (Fan Auto) if the fan key on
receiver is pressed.
• Timer value in Hrs (e.g. 01, 02) will be displayed when timer is set by the TIMER key on receiver
board.
• During any operation from the LCD transmitter, Display will show the set Temp as is displayed
on the LCD screen of Transmitter.
• In Standby State Display shows “OF”.
• Display blinks (After 250 Hrs) to indicate that Biocides needs to be replenished
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GENERAL USE
OASYS RUNS MOST EFFICIENTLY and provides superior cooling when allowed to run for
prolonged periods of time, using the automatic speed control capability of the Auto Cool mode. Short
periods of operation result in incomplete wetting of the media and lower cooling efciency. Therefore,
Manual Cool and Fan Only modes should only be used for the reasons listed in Table 1. Fan Only mode
does not lter air as effectively as the other two modes.
Table 1: Recommended Operation
OPERATING MODE WHEN TO USE
AUTO COOL All normal cooling use
MANUAL COOL Only when a constant fan speed is desirable
FAN ONLY When ventilation is needed on mild or cool days
AIR RELIEF. OASys pressurizes your house with cool air. If there is no escape route for the air, no
cooling can take place. If your house is equipped with ceiling-mounted relief vents with dampers, the
distribution of cooling among the rooms can be controlled by setting the damper position of the ceiling
vents. Air vented from the house will cool the attic and contribute to keeping the house cool. If you
have no ceiling-mounted vents, it will be necessary to open windows whenever the OASys is running.
Open the windows widest in rooms which need the most cooling. If your system uses a single supply air
grille (as opposed to air supply grilles in each room) it will be necessary to open all doors to the rooms
requiring cooling to provide an air ow path from the air supply grille through the rooms and to the at-
tic or exterior.
IFYOU ARE LOCATED in a climate which frequently experiences freezing temperatures and the
OASys is installed in an outdoor location, it is recommended that you disconnect and drain the water
supply line to avoid freeze damage to the line. If power to the OASys is to be disconnected for the win-
ter, drain the reservoir before shutting off the power, and cover the top vent to keep out rainwater and
debris. The OASys will drain itself automatically as described in the Operation Modes section. If power
is left on through the winter the unit will automatically discharge any collected rainwater, but covering
the top is still recommended to keep the inside of the unit clean.
POWER FAILURES. In the event of a power failure or power interruption the OASys will revert
to Auto Cool mode when power is restored. If there is water in the reservoir, the unit will enter a
purge cycle before resuming operation. To avoid simultaneous heating and cooling resulting from winter
power failures, the temperature set-point should be set high throughout the winter.
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HOW OASys WORKS
PRINCIPAL OF OPERATION
Your OASys uses the natural evaporation of water to provide cooling in a two-stage process that pro-
duces lower air temperatures with less humidity than direct evaporative coolers.The “indirect cooling
media” (ICM) provides the rst cooling stage. The ICM is a heat exchanger which cools the air without
adding moisture. The precooled air then passes through a high efciency direct cooling media (DCM)
where it is further cooled.
ELECTRICALLY OPERATED “ll” and “drain” valves maintain water quality. A oat switch in the
reservoir both maintains the proper water level and measures the rate of water replacement. A com-
puterized control integrates the operation of the blower, valves, and pump, and maintains the correct
blower speed.
Self Cleaning Features and Water Quality Maintenance
When a precisely measured quantity of water has been evaporated, the cooler automatically empties
its reservoir, discharging concentrated minerals from the water and particles washed from the air. The
reservoir then rells with fresh water. During this cleaning (or “purge”) cycle, which lasts 4 minutes, the
fan continues to operate at a reduced speed so that cooling is not interrupted.
THE FREqUENCY of the purge cycle can be adjusted. For example, in areas with very hard water
the controls are set to prevent more than a doubling of the concentration of dissolved solids, or two
“cycles of concentration”. Information on setting the purge cycle is provided in the installation section
of this manual.
IF THE UNIT HAS NOT bEEN OPERATED for more than 4 hours the reservoir will automati-
cally drain.
This feature, unique to OASys, prevents growth of harmful bacteria and eliminates odors by not allowing
water to stagnate.
WATER CONSUMPTION
Water use varies greatly depending on how much you operate the unit, water quality, and weather
conditions. Water consumption may be as little as 4 gallons per day and as much as 20 gallons per day.
Because water quality is closely maintained, water discharged from the reservoir may be used for land-
scape watering.
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MAINTENANCE and SERVICE
It is recommended that you arrange with your installer for an annual maintenance and service
inspection.
GENERAL TROUbLESHOOTING
ODORS
The DCM cellulose material is treated with binders during manufacturing which emit odors during the
rst few days of operation. The odors will gradually dissipate and should not be noticeable after one
week of regular use. You may use the thermostat mode button to ush the reservoir with fresh water
to more quickly eliminate the odors.
bUbbLES AND WATER CARRYOVER
The same binders that cause odors can cause bubbles to form on the surface of the DCM. The bubbles
may carry water droplets into the supply air outlet, especially when the fan is running at high speed.
Frequently ushing the reservoir during the rst week of operation should also cure this problem; if it
persists, contact your dealer.
MOLD CONCERNS
As with all HVAC equipment there is always the consideration of mold growth. Mold growth is a real
concern in single stage evaporative “swamp coolers”. The OASys unit has been designed with several
features that will prevent mold growth. If properly installed and maintained there should be no mold
growth in the OASys unit. As part of the annual service and maintenance of the unit a visual inspection
should be made to ensure that these features are working properly and that mold is not present in the
unit.
1.The Dump Cycle prevents the build-up of dirty water.
2.The Dry Out Cycle avoids the moist environment conducive to mold growth.
3.A biocide additive is available and should be used if the OASys is installed in a climate area that
experiences periods of relatively high humidity.
WINTERIzATION
If you live in an area subject to freezing temperatures, at the end of the cooling season turn off water
supply to the unit and ensure that the supply connection is drained and that the unit is dry. It is advis-
able to cover the unit to prevent inltration of cold outdoor air.
REqUESTING SERVICE
If you have difculty contacting your installing contractor or service representative, please e-mail
Speakman CRS at info@oasysairconditioner.com or see our website www.oasysairconditioner.com
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EXPLODED GRAPH UNIT
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INSTALLATION INSTRUCTIONS
INSTALLATION CHECKLIST
• If you have never installed an OASys before, read this manual from cover-to-cover
• Determine a suitable location for the OASys, observing clearance requirements
• Select air supply and relief locations
• Select thermostat location (not directly in the supply air stream)
• Correctly size all ducting and registers
• Provide for water service, drain, and electrical service
• Obtain all materials required for the installation
• Install the OASys in accordance with this manual and all applicable building codes
• Set controls for correct purge cycle frequency
• Clear pump inlet and inlet screen of any debris
• Verify proper system operation
• Instruct the owner on use of the system and provide them with this manual
SAFETY
The following precautions should be taken to avoid shock hazard when installing or servicing this unit:
• ALWAYS DISCONNECT POWER WHEN MAKING ELECTRICAL CONNECTIONS OR SER-
VICING THE UNIT. Removal of the control board while the unit is connected to power will
result in permanent damage to the board and exposure to shock hazard.
• In the event of water spillage inside the unit, disconnect power and allow all electrical compo-
nents to dry prior to restoring power.
• Observe wiring and grounding requirements as indicated in these instructions and the electric
code.
PLANNING THE INSTALLATION
SIzING
Two to three ton capacity depending on climate.
Selecting a Location for the OASys
The following information will help in selecting a location for the OASys:
• The OASys may be mounted on an outside pad, a roof or bracketed to a wall. The OASys can
be placed in a garage with adequate drainage in case of overow or leaks. Indoor installation
such as in an attic or utility closet is possible but not recommended. If the unit is not properly
installed leaking can occur which could seriously damage the interior of a home. A drain pan
should always be used in such an installation in case of condensation or other leaks. Interior
installation may nullify certain parts of the warranty and or service agreements.
• The OASys requires a dedicated 115V circuit, cold water supply, and a location to discharge drain
water in accordance with local codes.
• A supply air connection to the house, an outside air intake, and a “secondary” air outlet must be
provided
(see Fig. 1). Secondary air should be discharged to the outside, and may be discharged into an
attic or space
vented to the outside.
• Do not install the unit such that the air intake is 10 feet or less from an appliance vent outlet,
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INSTALLATION INSTRUCTIONS continued
exhaust fan discharge, plumbing drainage system vent, chimney outlet, or other source of con-
taminated air unless the outlet is more than 3’ above the cooler intake.
• For non-ducted systems, locate the unit so that it discharges air into common spaces such as
living rooms or hallways, but not so that it will create substantial drafts in seating areas. The air
supply should be at least 5’ above the oor.
• For ducted systems, duct connections should be as short as possible. Be sure to allow adequate
space for duct connections (see below).
• All systems require an air relief path, either into the attic through barometric dampers, or to the
exterior. Plan the installation so that air can travel freely from the OASys to the discharge open-
ings.
• The unit must be fully accessible for service (see clearance requirements, Fig 4.)
PLANNING FOR AIR DISTRIbUTION
UNLIKE REFRIGERANT-bASED AIR CONDITIONERS, which use multiple supply air outlets
to distribute cooling and one return air inlet, OASys systems can be installed with one or two supply air
inlets. Multiple “relief” locations distribute air to the various rooms. In many cases, supply air ducting
can be eliminated. The OASys is most easily installed on exterior walls with air supplied through a single
grille, but ducting may be used to distribute air if guidelines in this manual are followed. Improper duct
sizing will cause a reduction of air ow and cooling capacity.
SUPPLY AND INTAKE PLENUMS: Supply and intake plenums must be sized so that the air ve-
locity of any passage, including grilles, does not exceed 800 feet per minute (maximum velocity = 1766
divided by the air passage cross sectional area in ft²).
INTAKE AIR DUCTING: Intake air ducting methods depend on the type of installation. Wall mount
and exterior mount systems require no ducting. Units mounted in interior spaces or attics require
ducted intake air. To facilitate round duct connections, plenum should be at least 16” high. Do not cut
openings in the cabinet in any other locations.
SUPPLY AIR DUCTING: Size ducting for a maximum pressure drop of 0.25” static pressure. Mini-
mize the amount of ducting, relying on relief vents for air distribution. If sharing ducting with a furnace
and/or refrigerant air conditioner, insure ducts are properly sized and install back draft dampers at both
OASys and furnace supply plenums. Back draft dampers must be accessible for inspection.
DUCTING SECONDARY AIR: If necessary to isolate secondary air discharged from the back rear
of the unit from the intake, a duct connection may be made to the back rear of the unit. Discharging this
air to the outside is preferable.
AIR RELIEF: For proper cooling operation, air must be discharged from the house at the same rate
it is supplied by the OASys. The preferred method is to vent air into the attic through ceiling-mounted
grilles with barometric dampers. By venting air into the attic the attic is kept cooler, reducing ceiling
heat gain. Damper assemblies, or “Up-Dux”, are available as accessory equipment. At least four 12” x
12” reliefs should be installed per OASys unit. Air may also be discharged through wall-mounted damp-
ers, operable skylights, or secured windows.
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INSTALLATION INSTRUCTIONS continued
SERVICE CONNECTIONS
Electrical: Provide a 15 amp service and disconnect near the unit in accordance with local codes. Wir-
ing to the unit is made through a right side knockout. Use of exible liquid-tight conduit is recommend-
ed.
WATER SUPPLY: Provide a 1/2” or larger nominal pipe size water supply within 10’ of the unit, ca-
pable of delivering at least 2 gallons per minute of clean water at 20 psi minimum pressure. Connect to
the 3/8” FPT inlet water tting on the left side of the cabinet using 3/8” copper tube. A saddle tting
with shutoff valve may be used to adapt from the 1/2” pipe to a 3/8” compression tting. Provide a lter
if water contains sand or sediment.
DRAIN: If it is undesirable to discharge water at the unit, provide a suitable drain. The drain may be
discharged into a landscaped area, storm drain, or sanitary waste (indirect drain). Refer to local codes
for indirect drain requirements. Discharge water will not harm plants and may be used for irrigation.
The volume of water discharged ranges from about 4 to 20 gal. per day, depending upon local water
quality and outdoor conditions.
CONTROLS
Identify the thermostat location and determine the length of control wire required. A 15’ length of con-
trol wire with RJ-45 modular connectors pre-attached is supplied with each unit. If the required length
is greater than 15 feet, additional wire and connectors may be purchased from your dealer. Refer to the
Wiring and Controls Installation section for additional information.
WATER HARDNESS
The OASys keeps its water clean and low in mineral content by periodically emptying, or “purging” the
reservoir. The more rapidly water evaporates, the more frequently the reservoir is purged.
TO PROPERLY CONFIGURE THE CONTROL to maintain the correct mineral concentration in
the reservoir, it is necessary to estimate the hardness of the local water supply. If minerals in the water
are allowed to become too concentrated, deposits will build up on the media, affecting performance,
shortening media life, and increasing maintenance. Water will be wasted if water purge cycles occur
too frequently. Contact your water utility to determine the Total Hardness and Total Alkalinity. Use the
hardness rating from Table 9 to determine control settings as described in Setup and Testing. For more
detailed information on water maintenance refer to Munters Engineering Bulletin EB-WTM-502 (to
request call 800-446-6868).
TAbLE 9: Hardness Rating
TOTAL HARDNESS TOTAL ALKALINITY
(parts per million) (parts per million) HARDNESS RATING
Less than 100 Less than 60 Low
100-140 60-80 Moderate
140-180 80-120 Moderate-High
Greater than 180 Greater than 120 High
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18
INSTALLATION INSTRUCTIONS continued
PREPARATION FOR MOUNTING
Preparation for mounting the OASys will vary with each installation type. Refer to application informa-
tion for the specic type of installation (Wall, Rooftop, or Pad). Be sure to install a drain pan under the
unit if installing in an area subject to water damage. To avoid water spillage during operation, the unit
must be installed on a dead-level surface or plenum, or mounted to a “plumb” wall.
UNPACKING AND INSPECTION
Parts Included
Parts shipped with the standard OASys unit include the cabinet with blower, media assembly, and con-
troller; thermostat, and thermostat wire (with modular connectors pre-installed). Optional parts include
ceiling and/or wall dampers, wall mount duct, and intake air plenum
The Blower Assembly includes the blower housing, and motor. The GE motor incorporates electronic
components which should not be exposed to moisture.
The Media Assembly is composed of the plastic indirect media, Celdek cellulose media, water distribu-
tion system, and shroud.
The Cabinet encloses the blower and media assembly, and supports the circulating pump, ll valve, and
drain pump. The control box, which contains the control board, is mounted inside the cabinet behind
the upper access panel. Power connections are made in the lower partitioned area of this box.
INSTALLATION
CAbINET INSTALLATION
Regardless of mounting location, the cabinet must be installed “plumb”. Water leakage may occur if the
unit is installed at an angle. Important: Recommended installation is outside on a pad or rooftop mount.
It is not recommended to install the OASys in an attic.
On outdoor installations performance may be improved if installation is out of direct sun light or insula-
tion is used to block the sun from the cabinet and ducting.
DUCTING
First, you should determine if you are installing a CRS 1000 or CRS 1100 unit. Both units are essentially
identical but have different UL ratings. The CRS 1000 unit is “UL Classied” as a ducted unit. The CRS
1100 is “UL Listed” as a room unit. If you are installing a CRS 1100 unit a short duct run to a single
room can be used.
Install ducting in accordance with applicable codes, and applications information provided by your dealer.
Ducts should be sized using ACCA Manual D or other methods for a maximum total pressure drop of
0.25” external static pressure. Avoid use of berglass board or berglass duct lining. If ducts are to be
lined for sound attenuation or prevention of heat gain, use AP Armaex SA duct lining or an equivalent
product. Tightly sealed and insulated ducts will insure that the OASys delivers its full cooling capacity.
WATER CONNECTIONS
Connections are ¾ “ garden hose ttings.
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OASys SERVICING and MAINTENANCE DRAWINGS
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