Desert Aire GreenAire User manual

Indoor Air Quality
Aura™ (QS)
TotalAire™ (QS)
VerticalAire™ (QV)
• Climate control
systems that provide
cooling, dehumidifi-
cation, and optional
auxiliary heating for
Controlled Environ-
mental Agriculture in a
single, highly efficient
package.
• The GrowAire®GA
Series climate control
system offers a
all-in-one packaged
rooftop configuration.
• The GrowAire®GS
Series climate control
system is available in
a wide range of indoor
and outdoor configura-
tions and sizes to
match the application
requirements.
• The GrowAire®GV
Series climate control
system is a high-quality
cost-effective system
designed for tight
spaces
GreenAireTM
Climate Control Systems
Installation and Operation Manual
• Water system for use
with chilled/hot water
• CEA specic controls
• Unique control over
internal water ow
and temperature
• Internal chilled water
recirculation pump
• Internal chilled water
and hot water valves
Indoor Air Quality
Aura™ (QS)
TotalAire™ (QS)
VerticalAire™ (QV)
Installation and Operation Manual
• Climate control
systems that provide
cooling, dehumidifi-
cation, and optional
auxiliary heating for
Controlled Environ-
mental Agriculture in a
single, highly efficient
package.
• The GrowAire®GA
Series climate control
system offers a
all-in-one packaged
rooftop configuration.
• The GrowAire®GS
Series climate control
system is available in
a wide range of indoor
and outdoor configura-
tions and sizes to
match the application
requirements.
• The GrowAire®GV
Series climate control
system is a high-quality
cost-effective system
designed for tight
spaces
GS Series™
GV Series™
GA Series™

2

3
DANGER
ONLY TRAINED, QUALIFIED PERSONNEL SHOULD INSTALL AND/OR SERVICE
DESERT AIRE EQUIPMENT. SERIOUS INJURY, DEATH AND PROPERTY DAMAGE CAN
RESULT FROM IMPROPER INSTALLATION/SERVICE OF THIS EQUIPMENT. HIGH VOLTAGE
ELECTRICAL COMPONENTS AND REFRIGERANT UNDER PRESSURE ARE PRESENT.
For any unit labeled Class 1, Group D, Division 2, all wiring must be in accordance to
Class 1, Group D, Division 2 requirements. Insure that all local, state, national and any
other applicable codes are adhered to when connecting any device to this equipment.
All electrical connections to units labeled Class 1, Group D, Division 2 must be done
with a conduit seal.
Desert Aire
Climate Control Equipment Standard Limited Warranty
Desert Aire warrants the climate control unit to be free from defects in materials and workmanship subject to the
terms, conditions and limitations stated herein.
TERMS
Desert Aire warrants all components (except as noted) for a period of two (2) years from the date of shipment. This
warranty shall be limited to the supply of new or rebuilt parts for the part which has failed because of
defects in workmanship or material, and does not include the cost for labor, transportation or other costs not herein
provided for. Replaced parts are warranted only for the remaining portion of the original warranty period.
CONDITIONS
The warranty is subject to the following conditions:
1. The unit must be properly installed and maintained in accordance with the Desert Aire
“Installation and Operation Manual” provided with each unit and/or other documentation provided.
2. The Start-Up Report must be completed and returned to Desert Aire Service for evaluation. If no
  decienciesareidentiedaWarrantyValidationLetterwillbeissuedthatprovidesallwarrantydates
  andcoverage.Ifinstallationorstart-updecienciesarepresent,thesemustbecorrectedand
communicated to Desert Aire in order to activate warranty.
3. This warranty shall not apply to any part that has been tampered with, or has been subject to
misuse, negligence or accident. A warranty can be obtained for altered equipment but only with
written consent from Desert Aire.
4. The following parts and components are excluded from the warranty: belts, lters, driers, fuses.
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4
5. Coils or other components that corrode due to corrosive air quality will not be warranted.
6. All replacements or repairs will be FOB Germantown, WI.
7. This warranty shall be null and void if defects or damages result from tampering with factory set controls,
or operating outside the original design conditions.
8. Desert Aire shall not be liable for labor costs incurred in diagnosing the problem, or the removal
or replacement of the part or parts being repaired.
9. Desert Aire must preauthorize all warranty coverage described herein.
Extended Warranty:
Your Desert Aire unit may have extended warranties beyond this Standard Limited Warranty document.
Extended warranties are only available at the time of the purchase of the original equipment. These extended
warranties are covered under a separate document and their terms and conditions are separate from this
document. It is mentioned in this document for informational purposes only. Any Extended Warranties will be
identied on the Warranty Validation letter.
Any and all incidental or consequential damages are expressly excluded from this warranty. Some states do not allow
the exclusion of incidental or consequential damages for personal injury, so the above limitations may not apply to you
for certain damages. This warranty gives you specic legal rights, and you may also have other rights, which vary
from state to state. No person or representative is authorized to make any warranty or assume any liability not strictly
in accordance with the aforementioned.
Inquiries regarding warranty matters should be addressed to:
Desert Aire Corp c/o Service Manager
N120 W18485 Freistadt Road • Germantown, WI 53022 USA
PH: 1(262) 946-7400 • FAX: [phone] • E-MAIL: [email protected]
Additional copies of this manual can be purchased for a nominal fee from Desert Aire. Submit requests to the contact
information listed above.
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5
Safety Labels are used throughout this manual. They comply with the ANSI Z535.4 Standard.
Pleasebefamiliarwiththefollowinglabelsandtheirdenitions.
This is the safety alert symbol. It is used to alert you to potential
personal injury hazards. Obey all safety messages that follow this
symbol to avoid possible death or injury.
Indicates an imminently hazardous situation which, if not
avoided, will result in death or serious injury.
Indicates a potentially hazardous situation which, if not
avoided, could result in death or serious injury.
Indicates a potentially hazardous situation which, if not
avoided, could result in minor or moderate injury.
Caution used without the safety alert symbol indicates a
potentially hazardous situation which, if not avoided, could
result in property damage.
Product Warning for the State of California
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TABLE OF CONTENTS
1 Introduction ................................................................................................................................. 9
1.1 Inspection ...................................................................................................................... 9
1.2 Freight Damage Claims ............................................................................................... 9
1.3 Rigging .......................................................................................................................... 9
1.3.1 Rigging the Unit ................................................................................................. 9
2 Installation .................................................................................................................................. 12
2.1 Location and Access ...................................................................................................... 12
2.2 Duct Installation ............................................................................................................ 13
2.3 Condensate Drain Piping .............................................................................................. 14
2.4 Unit Door Access and Lock ........................................................................................... 16
2.5 Water Piping Installation ................................................................................................ 18
2.6 High Voltage Wiring ...................................................................................................... 21
2.6.1 High Voltage Connections ................................................................................. 21
2.6.2 Wire and Fuse Sizing ........................................................................................ 22
2.7 Controls and Sensors ................................................................................................... 22
2.7.1 Zone Sensor ...................................................................................................... 23
2.7.2 Photo Sensor ..................................................................................................... 24
2.7.3 Remote Display Terminal (Optional) .................................................................... 25
2.7.4 CO2 Sensors (Optional) ........................................................................................ 26
3. Start-Up Procedure ................................................................................................................... 29
3.1 Preliminary Inspection ................................................................................................... 29
3.2 Principle of Operation .................................................................................................... 29
3.3 Airow Balancing ........................................................................................................... 30
3.3.1 Blower Adjustment Procedure ........................................................................ 31
3.4 System Testing .............................................................................................................. 31
3.4.1 Dehumidication / Cooling Mode .................................................................... 32
3.5 General Testing ............................................................................................................ 32
3.6 Routine Maintenance Schedule ................................................................................... 33
3.6.1 Service Every Month ........................................................................................ 33
3.6.2 Service Every Six Months .................................................................. .............. 34
3.6.3 Service Every Year ............................................................. .............................. 34
4 Troubleshooting ........................................................................................................ .................. 35
4.1 The Fan Does Not Run .................................................................................................. 35
4.2 The Pump Does Not Run ............................................................................................... 35
5 Appendix ...................................................................... ................................................................ 37
5.1 Recommended Duct Design ... ........................................................................................ 37
5.2 Recommended Controller Settings ................................................................................ 38
5.3 GreenAire™ Sequence of Operation ............................................................................. 38
5.3.1 Basic Sequence ...................................................................................................... 38
5.4 Component Replacement, Drain & Leak Instructions .................................................... 41
5.5 System Rating Plate ...................................................................................................... 42
5.6 Start-Up Suppervision Supplemental Information ......................................................... 43
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5.7 System Start-Up Report .................................................................. .............................. 44
Start-Up Request Form ................................................................................................ 45
GR Series Start-Up Report ............................................................................. .............. 47
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8Desert Aire - GreenAire™ Manual

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1. Introduction
Desert Aire climate control units are designed to provide years of reliable service when installed
properly. Read these instructions carefully before you install the unit.
1.1. Inspection
Desert Aire inspects and tests each climate control unit before it leaves the factory so that you
receive a quality piece of equipment. Unfortunately, equipment may become damaged in
transit. Inspect the unit carefully before signing the receiving papers. Check for both visible and
concealed damage. Remove crating and inspect the exterior cabinet for damage. Dented
panels, broken crating or any uid leaking from the unit should be documented upon delivery.
1.2. Freight Damage Claims
Freight is shipped FOB, if damage is noted, the BOL must be marked damaged to process a
claim - Failure to do so will void any future claims
If the unit has been damaged, document the extent of the damage. Take pictures if possible.
Next, obtain a claim form from the carrier. Promptly ll out and return the form. Carriers may
deny claims that you have not lled out within a week of delivery. Notify Desert Aire of any
damage. Damaged units must have signed documents at the time of delivery to be eligible
for a freight claim.
1.3. Rigging
1. Failure to observe rigging instructions may lead to equipment damage, personal
injury, or death.
2. Lifting method and procedure must comply with all local and national codes and
regulations.
3. The use of safety slings in addition to lifting lugs is required.
4. Do not lift the dehumidifier in high winds or above people.
Desert Aire equipment is solidly built and can be very heavy. Avoid personal injury and damaging
the equipment by planning the installation carefully. Use moving equipment whenever possible.
1.3.1. Rigging the Unit
Depending upon the unit type, various rigging methods are used to best lift the
equipment. Please reference the applicable sections below:
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• GreenAire™ Products (GR)
-Vertical Cabinet Models (GRAV,GRBV,GRCV,GRDV)
Personnel should avoid stepping on the top of the unit. Desert Aire
air handlers are not designed to support the weight of a person on all
portions of the roof. Damage incurred through caved or distorted top
panels will not be covered under warranty. If you must walk on the top
panels, carefully walk on the edges where structural integrity is
greatest.
Figure 1 - Fork Pocket Locations
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Desert Aire - GreenAire™ Manual
Move the unit to the desired installation location with the unit still on
the wood pallet. To remove the unit from pallet, position fork lift parallel
to the fork pockets in the bottom of the unit and found at each end and
in the middle of the unit. Use only the fork pockets to avoid damage.
The unit will have to be carefully removed from the fork lift and placed
into the desired location using hand truck equipment dollies or pipe
rollers. Use caution to not damage the unit with the fork lift or tip the
unit over ensuring it is kept as level as possible. The Vertical Cabinet
GR unit is designed to t through a standard size door (the door itself
may need to be removed temporarily) but will require that the air lter
box be removed or not installed until after the unit is in the nal
location. The unit should be assembled as close to the location of
installation as possible. Use caution when moving the unit through a
doorway to not catch the hinges on the door frame. It may be
necessary to remove the wood pallet to get the unit through the
doorway.
1. Do not tip the unit on its side.
2. Avoid dropping the unit down stairways or subjecting it to severe mechanical shock.

12 Desert Aire - GreenAire™ Manual
2 Installation
 Manualappliestostandardunitcongurationsonly.
2.1 Location and Access
Desert Aire GreenAire™ air handlers are congured to allow access from the rear and the
sides. This means you can make your service connections and perform routine maintenance
when you must install one side of the air handler close to a wall or other restriction. The
“access side” is the long side with the access doors. The shorter sides also have access
doors. It is recommended that clearance be provided for all of these doors to allow for ease of
service ability in the event large components require replacement. Allow a minimum of 36
inches of clearance around the shorter sides of the air handler for piping, electrical
connections, and service access. Refer to the general arrangement drawing for further details.
Figure 2 - Required Clearance for Working and Safety

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Desert Aire - GreenAire™ Manual
Install the unit on a sturdy, level mounting base or platform that will prevent vibration and
sound transmission. Never install the air handler on a wooden or metal platform without
consulting the design engineer for isolation requirements and / or sound control materials.
Do not install the unit near occupied rooms such as o󰀩ces or guest rooms. Do not attempt to
conserve installation space by fabricating restrictive ductwork with abrupt bends. You may
reduce the operating e󰀩ciency and the moisture removal capacity of the air handler. See
section 2.2 or 5.1 for detailed duct installation instructions.
Units located in unconditioned spaces may form condensation on the exterior of the cabinet as
well as in the interior surfaces. Precautions should be taken for indoor units located within
unconditioned spaces to prevent damage resulting from condensation. When the unit is
exposed to low temperatures, the interior surfaces may become cold enough to drop below the
dewpoint. Condensation may then form on the cold interior surfaces and result in water
collecting; this result could be especially problematic in the electrical box. If the unit is located
in either an outdoor space or in a location that is near a doorway or window which may lead to
humid air entering the air handler unit, condensation is possible. In a unit located outdoors,
some condensation will collect on exterior panels.
Do not install an indoor-rated air handler in an outdoor or a wet environment.
If you must install an air handler outdoors you must use an outdoor-rated air handler. Desert
Aire seals and weatherproofs outdoor air handlers to help prevent water inltration. You can
determine whether your air handler is outdoor-rated by inspecting the unit rating plate. See
section 5.5 for details.
2.2 Duct Installation
Duct design and installation should conform to the latest ASHRAE and SMACNA low velocity
duct standards. See section 5.1 for details. Undersized, restrictive ductwork with abrupt turns
or transitions, can decrease the e󰀩ciency and the moisture removal capacity of your unit. Size
the ductwork for an acceptable air pressure drop at the airow volume of your unit. Use
neoprene ex connectors when you attach ductwork to the unit to prevent transmission of
excess vibration and noise.
Select the grilles, registers and di󰀨users for low static pressure loss, required throw distance,
and the specied CFM rating. You can nd this information in most grille manufacturer’s
catalogs. If you are installing the grilles in a corrosive environment, choose components made
from anodized aluminum.
If you must install ductwork in an unconditioned area, use berglass duct wrap with vapor
barrier facing. You must install the outdoor air intake away from all sources of airborne
contamination such as exhaust fans or plumbing vents. You can use galvanized sheet metal
ducts for most applications. However, you should use aluminum or stainless steel ducts for
extreme applications such as chemical-laden environments.

14 Desert Aire - GreenAire™ Manual
2.3 Condensate Drain Piping
Condensate drain lines installed in an unconditioned space must be heat taped to
prevent freezing. Check the heat tape yearly before winter operation.
The condensate drain connection may be on the side or the bottom of the unit, depending on
the size and style of the cabinet used.
Note: While the supply fan runs, the drain pan area inside the air handler operates at a
negative pressure. Your unit requires a waterless trap or P-trap in the condensate drain pipe to
prevent condensate from being drawn into the cabinet of the air handler.
Figure 3 - Condensate Piping (Side-Mounted Drain Shown)
Waterless Trap Option
A waterless trap may have been included on your GreenAire™ order. This type of trap is highly
recommended in the application. When units are installed outdoors in freezing conditions, the
waterless trap reduces risk of freezing of the trap should there be prolonged periods of shut
down. It also eliminates the need to ensure that the trap is pre-primed on initial start. It can
assist where there is limited height available on higher negative static pressure return ducts or
when indoor units are not placed on a housekeeping pad.

15
Desert Aire - GreenAire™ Manual
When condensation is not present, the negative pressure within the plenum draws the internal
mechanism against the valve seat preventing air from entering the AHU through the drainpipe.
As condensate forms, water builds up in the vertical pipe. When the water pressure equals the
negative air pressure in inches of water column, the force of the water head becomes equal or
greater than the negative pressure and the internal mechanism moves to the right, and water
ows.
When there is no longer a requirement to remove condensation, the negative pressure returns
the ball to the valve seat and prevents airow to the unit plenum. The internal rails aid in
returning the ball to the seat.
Figure 4 - Waterless trap ball valve
The column of liquid within the GreenAire™ unit is adequate for moving the ball from the valve
seat. No additional drop of the condensate line is required outside of the unit for external static
pressures up to 2” w.c.
Condensate lines operating in freezing temperatures will still require heat trace and insulation
to prevent freezing in operation.
If waterless traps are needed, these can be purchased by contacting Desert Aire Service
department. If a P-trap is used, it should be of adequate depth to prevent water from drawing
into the cabinet on startup and to hold enough water when the fan is o󰀨 such that the trap will
not lose the prime on the next start. The depth of each leg and the ratio between these is
important.
4”
4”
Figure 5 - Sectional View of Condensate Trap Requirements

16 Desert Aire - GreenAire™ Manual
Trap the condensate as shown in Figure 5. The P-trap dimensions in Figure 5 are sized for a
maximum return air static of 2.0” of water. If your return air static exceeds this specication,
consult Desert Aire for help in resizing the P-trap.
You may also need to install a cleanout tee or plug near the trap. Note that the drain opening
in the drain pan is o󰀨-center to simplify its cleaning and servicing. Once you have designed
and installed the trap, follow this sequence:
1. Connect the trap to a main drain line with 1/4” of downward pitch per linear foot of run.
2. Support the drain pipe every ve feet to prevent sagging.
3. After you install the drain piping, prime the trap by pouring water into the drain pan of
the air handler.
2.4 Unit Door Access and Lock
The doors are removable to allow for access in close spaces. To open the doors, grasp the
latch by the rounded section on the door and pull outward (see photo below). When the latch
handles are rotated 90 degrees, they can be pulled outward and disengage from the door
frame (see photo below). To reattach the handles, push the door closed and rotate the latches
shut.
Figure 6 - Door hinge/latch in closed position
By opening all four latches, the door may be pulled o󰀨 the unit for better accessibility. Grasp
the latch by the protruding T-shaped section and pull outward to remove the hinged section.

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Desert Aire - GreenAire™ Manual
Figure 7 - Door hinge/latch in open position
The latch has a hex head shaped key slot that is used to lock the latch and prevent opening
and removal of the door. There is a ridge next to the slot that indicates whether the latch is
locked or unlocked. If the latch is open, the ridge is horizontal. To lock the latch, rotate the hex
head with an Allen wrench 90° until the ridge is vertical. The ridge next to the slot on the
unlocked latch will align with a similar ridge in the middle of the body of the latch handle. There
is a second ridge that aligns with the locked position. There is a raised line that says “OPEN”
which leads from the locked ridge to the unlocked ridge.
Figure 8 - Latch, note positions of the ridges

18 Desert Aire - GreenAire™ Manual
2.5 Water Piping Installation
The air handler may be connected with a water tower or a chilled water unit. Use industry
standard piping practices when connecting to such a unit. Connections are copper stubs. Refer
to submittal documentation for specic size per model.
Water Quality and General System Design
A 60 mesh or ner strainer must be installed in the water inlet line. Flush eld-installed piping
thoroughly before you put the air handler into service. A piping system not properly ushed or
ltered will cause the water ow control valves or heat exchanger to lose e󰀩ciency or fail
prematurely due to clogging and/or fouling.
To prevent premature failure of the system, maintain the water at a pH of 7.4, but never below
6.0. Do not use water with high concentration of sulfur, chlorine, or sodium chloride.
See specic Flow Rate section for the required water ow rate and head for your application.
Install an air eliminator at any high point in the water piping. Air trapped in the water circuit of
the air handler can lead to poor system performance, unexpected service calls, and
decreased equipment life.
Do not exceed these guidelines as excessive flow rates will erode the condenser and piping.
GreenAire™ Products Flow Rate
The ow rate, pressure, and glycol concentration (if used) will depend on the installation. If
any part of the system is to be installed outdoors, the system must be protected by antifreeze
at an adequate concentration to prevent freezing. For purposes of burst protection during
system idle times and during storage, a minimum of 30% ethylene glycol or 35% propylene
glycol is recommended if any part of the system is installed in locations subject to freezing
conditions. This concentration will prevent system damage. Note that damage to heat ex
changers or piping due to freezing conditions is not covered under warranty.
For units that are required to start at very low ambient temperatures, higher antifreeze
concentrations may be required. If units installed outdoors are to be idle and will be required
to start at low temperatures, review low temperature starting concentrations in Figure X. Note
that the uid will warm rapidly after starting, but it is critical that the loop be insulated to protect
from signicant condensation and freezing when the water is cold.
.

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Desert Aire - GreenAire™ Manual
Minimum Temperature (°F) Minimum Concentration (%)
Ethylene Glycol Propylene Glycol
20 17 19
10 26 31
0 34 38
-10 41 45
-20 46 49
-30 50 53
Figure 9 - Antifreeze Concentrations for Low Ambient Starts
Solutions less than 30% or uids without inhibitor packages may require additional inhibitors
to prevent corrosion and avoid risk of bacterial contamination. Consult the antifreeze uid
supplier for additional information on inhibitors and water quality in loops.
Note that chiller manufacturers, particularly those that utilize a plate heat exchanger, may
require freeze protection uids at low temperatures to prevent freezing of uids in heat ex
changers even if the loop is fully indoors. Consult the chiller manufacturer for
recommendations concerning antifreeze to ensure that minimum requirements are also
maintained for chiller operation.
Chilled Water Flow and Pressure
The chilled water loop in the equipment includes a circulation pump and a valves that
modulates the temperature and ow rate through the system. The system is intended to be
used with a variable speed primary loop.
It may be noted that the ow through the system varies depending on the load. Testing during
startup should be done at maximum cooling capability to ensure that enough ow is available
for specied unit performance. See Figure 10 for the ow rate specication at maximum
cooling.
A minimum pressure is required at the inlet of the unit to protect the internal pump from
cavitation and damage. This minimum pressure is the Net Positive Suction Head Required
(NPSHr). Units that are on the same level as the primary pump or lower typically do not have
issues with this requirement. Should the unit be installed above the primary pump, ensure that
the Net Positive Suction Head available is greater than the requirements shown in the chart. It
should be noted that these values are shown in absolute pressure rather than gauge pressure.

20 Desert Aire - GreenAire™ Manual
Figure 10 - Chilled Water Flow Rate
Hot Water Flow and Pressure
Hot water is provided to the GreenAire™ units to reheat or heat the air. The hot water system
in the GreenAire™ unit includes a valve to vary the ow. There are two options. The unit can
be congured with a two-way valve or a three-way valve. Two-way valves are typically used
on systems with modulating pumps. Three-way valves are typically used with systems with
xed speed primary pumps.
It should be noted that the pressure drop shown is for water only (0% antifreeze). For units
with antifreeze, refer to the submitted specications or the equipment label for the pressure
drop at the specic antifreeze type and concentration.
Model Size Fluid Flow Rate Pressure Drop (Water)
(GPM) (ft w.c.)
GRAV 9.6 8.1
GRBV 14.1 16.6
GRCV 18.0 17.5
GRDV 24.7 25.8
Figure 11 - Hot Water Flow Rate
 SpeciedFluidFlowRatesandTemperatures
Performance in the application has been determined based on the ow rates and
temperatures given in specications by the design professional. The expected ow rate and
temperature for both the hot water system and the chilled water system are shown on the unit
labels. At the time of startup, place the unit in a maximum cooling condition and a maximum
heating condition to ensure that temperature and ow rate is as expected. The unit
Model Size Fluid Flow Rate NPSHr
(GPM) (psia)
GRAV 18.9 6.1
GRBV 35.0 6.2
GRCV 5.18 6.6
GRDV 61 7.1