DryGair DG6 User manual
June 2020
Ver. 06/2020
DryGair Dehumidification Unit
Installation, Operation, and Maintenance
Manual (50 Hz & EU Models)
DryGair Energies Ltd.
ii
DryGair Energies Ltd. — www.drygair.com
8 Hamanofim St., Herzliya Pituach 46733
Tel.: 972-9-7730980, Fax: 972-9-7730989
: drygair.energies
Proprietary and Confidential
Copyright © 2020 by DryGair Energies Ltd.
All rights reserved. No part of this manual may be reproduced or copied in any form by any means-
graphic, electronic, or mechanical, including photocopying, typing or information retrieval systems-
without written permission of DryGair Ltd.
DryGair Dehumidification Unit
Table of Contents
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TABLE OF CONTENTS
1. Introduction _________________________________________ 1
2. Safety ______________________________________________ 3
3. Unit Overview ________________________________________ 6
4. Installation __________________________________________ 9
List of Figures
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LIST OF FIGURES
Figure 2-1. DryGair Identification label__________________________________________ 5
Figure 3-1. DryGair unit (front view) ____________________________________________ 8
Figure 3-2. DryGair unit (rear view) ____________________________________________ 8
Figure 4-1. Transferring the unit______________________________________________ 14
Figure 4-2. Compressor transport locks after removal _____________________________ 16
Figure 4-3. Air distributor module (4-way canopy) ________________________________ 17
Figure 4-4. Water drain outlet________________________________________________ 19
Figure 4-5. Electrical switchboard and electricity terminal block _____________________ 20
Figure 4-6. Hole for main power cable _________________________________________ 21
Figure 4-7. Replacing wire channel cover ______________________________________ 21
Figure 5-1. Temperature and humidity sensor ___________________________________ 22
Figure 5-2. Sensor unit_____________________________________________________ 22
Figure 5-3. Defrost temperature sensor ________________________________________ 23
Figure 5-4. Electrical compartment ___________________________________________ 24
Figure 5-5. Compressor (front view)___________________________________________ 27
Figure 5-6. Compressor (rear view) ___________________________________________ 27
Figure 5-7. Oil pressure protector and switches__________________________________ 28
Figure 5-8. Service compartment (DG-12) ______________________________________ 29
Figure 5-9. Expansion valve_________________________________________________ 29
Figure 5-10. Service compartment (DG-12 EU) __________________________________ 30
Figure 5-11. Electronic Expansion valve (DG-12 EU) _____________________________ 30
Figure 5-12. Sight glass ____________________________________________________ 31
Figure 5-13. Axial blowing fans ______________________________________________ 31
Figure 6-1. Humidistat controller _____________________________________________ 35
Figure 9-1. Four-direction canopy ____________________________________________ 66
Figure 9-2. Air distributor module (4-way canopy) ________________________________ 67
Figure 9-3. Side canopies (different orientations) ________________________________ 68
Figure 9-4. Air distribution panel _____________________________________________ 69
Figure 9-5. Air heating option ________________________________________________ 70
Figure 9-6. Temperature valve controller _______________________________________ 71
Figure 9-7. DryGair split unit ________________________________________________ 73
Figure 9-8. Connecting copper tubes (lower section)______________________________ 74
Figure 9-9. Tube stop valves – lower section (left) & upper section (right) _____________ 75
Figure 9-10. Electrical cables ________________________________________________ 77
Figure 9-11. Fan connections________________________________________________ 77
Figure 9-12. Brown terminal block (50–56) _____________________________________ 78
Figure 9-13. Water drainage ________________________________________________ 79
Figure 9-14. Unit with heating/cooling _________________________________________ 80
Figure 9-15. Climate control relays ___________________________________________ 81
Figure 9-16. Temperature valve controller ______________________________________ 83
Figure 9-17. Temperature valve controller and serial communication card _____________ 83
Figure 9-18. Controller cover centerpiece ______________________________________ 84
Figure 9-19. Communication card in the controller _______________________________ 84
DryGair Dehumidification Unit
Introduction
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1. INTRODUCTION
This manual provides instructions for operating the DryGair unit correctly
and safely, including installation instructions, maintenance procedures, and
unit troubleshooting.
As DryGair continuously develops its machines to their maximum potential,
this manual, though completely up to date when issued, is subject to changes
without notice.
1.1 Before You Begin
Before you begin working with the DryGair dehumidification unit, read this
manual. The DryGair dehumidification Operation and Maintenance Manual
provides information and procedures for installing and operating the unit, as
well as maintenance, troubleshooting, and repair procedures.
When reading, pay special attention to:
•The safety instructions.
•The conventions. They explain the symbols used in this manual.
Before beginning a procedure, read the procedure through to the end. A
thorough understanding of the entire procedure will prevent unnecessary loss
of time and error.
1.2 Further Information
For further information, contact DryGair at:
Email: info@drygair.com
Website: www.drygair.com
Online Technical Support Webpage: https://drygair.com/technical/
Introduction
Conventions
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1.3 Conventions
The following conventions are used in this manual:
Warning
Information given in a “warning” message warns of a possible hazard to
personnel and extreme hazard to the unit.
Caution
Information given in a “caution” message refers to the safe operation of
the unit and provides a warning where the possibility for damage to the
equipment exists.
Note
Information given in a note describes how the part/unit functions or
provides a tip on how best to use it.
DryGair Dehumidification Unit
Safety
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2. SAFETY
DryGair Energies Ltd. believes that the safety of personnel working with and
around the unit is the most important consideration. The DryGair unit is
equipped with all the safety devices necessary to ensure risk-free use under
standard conditions.
Machine installation, maintenance, and adjustments must be performed only
by a qualified technician with expert machine knowledge and that has read
this manual.
Before operating the unit or performing maintenance operations, read and be
familiarized with the safety information.
•Obey and follow all warnings and cautions given in this manual.
•Comply with all approved and established precautions for operating
electrical and mechanical equipment.
•Only qualified and authorized personnel should perform maintenance or
repair tasks.
•Verify the power, and any other connected facilities, are turned off and
disconnected before beginning maintenance procedures, part
replacements, or repairs.
•We advise strict observance of the work safety standard as defined by the
authorities in each country.
DryGair cannot accept responsibility for injury to persons or damage to
objects resulting from not observing safety standards.
2.1 Hazards
Danger: Electrical Shock Hazard. High voltage is present at points throughout the
Unit. Contact with high voltage can result in injury or death. Before performing any
operation related to electricity, open the electric compartment cover, switch off the
Main Power switch and switch off the Circuit Breaker. Doing so ensures no voltage
is present.
Danger: Hot Surface Hazard.The heat exchangers and their pipes, and the
compressor may have a high temperature during unit operation. Do not touch the
compressor and the heat exchanger pipes and coils while the unit is operating.
Verify the unit has cooled down before touching them.
Danger: Bodily Injury Hazard. Be careful not to drop any of the unit parts.
Dropping the Covers might cause bodily injury or damage to the parts.
Safety
Operation Safety Notes
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2.2 Operation Safety Notes
The following safety practices must be complied with:
•CAUTION and WARNING notices posted on the machine and safety
notes in this manual.
•Ensure that all control panels and electrical panels are covered.
•Do not start the unit if any of the safety covers are missing.
•MOVING PARTS – Do not touch the fans during unit operation.
•Do not permit smoking or food in the working area.
•Personnel operating the unit must not remove covers or panels.
•Although the electrical compartment is closed by a door, operator access
to the compartment is strictly forbidden without explicit authorization.
•Ensure that all personnel operating the unit know where the main power
switch is located and what to do in case of an electrical emergency.
•Locate approved types of fire extinguishers near the equipment.
2.3 Maintenance Safety Notes
Only authorized personnel are permitted to perform maintenance and repair
tasks. Before performing such a task, read the instructions to ensure you
understand them and that the required precautions and tools are available.
•For high mounted maintenance procedures, use a stable ladder to avoid
high fall injuries.
•To avoid getting caught in moving parts, do not lubricate, repair or adjust
the machine while in operation unless expressly written in the manual.
Stop the machine according to the machine stopping procedure before
lubricating or performing other maintenance tasks.
•Secure electrical wires and cables to prevent damage.
•The protecting doors and covers should not be opened during machine
operation.
•Replace all safety shields after completing set-up, troubleshooting and
maintenance procedures.
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Safety
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2.4 Unit Labels
The following Identification label is attached to the right-side panel.
Figure 2-1. DryGair Identification label
•Model---------------- The model number provides information on the specific unit
•Ps max -------------- The maximum operating pressure
•Capacity ------------ The drying capacity of the unit (at 18°C and 80% RH)
•I (oper max) ------- The maximum operating current
•Serial No.----------- The serial number of the specific unit
•Refrigerant -------- The type of refrigerant used in the unit
•Quantity ------------ The amount of refrigerant to fill in the unit
•GWP ----------------- Global warming potential parameter
•CO2Equivalent --- Emissions comparison measurement between Refrigerant and
CO2
•Input watt ---------- The power required by the unit (at 18°C and 80% RH)
•Total weight ------- The overall weight of the unit
The following warning labels are attached to the panels of the DryGair unit.
Attention high voltage
Caution hot surface
Hearing protection
required
Lift from here notice
Unit Overview
Standard Features
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3. UNIT OVERVIEW
The DryGair dehumidifying unit is designed and manufactured by DryGair
Energies Ltd. The unit is designed for the dehumidification of greenhouses
and can also be used in any other closed structure.
The unit reduces the humidity in the greenhouse according to a defined set-
point by pulling the wet cold air from the bottom of the greenhouse,
extracting the water, heating the air, and blowing the drier and warmer air
back into the greenhouse through an air distribution module.
The unit can also be configured to heat or cool the dried air.
The water condensed during the dehumidification process is removed from
the greenhouse through water drainage and can be reused for other purposes
such as a hydroponic system.
3.1 Standard Features
The standard unit includes the following features:
•Humidification Set-Point – ensures the humidity in the greenhouse is
kept at this set-point.
•Temperature Control – stops the unit when the temperature drops to
10°C to protect it from frost, and goes through a defrost cycle when the
temperature reaches 6°C.
3.2 Available Models
The DryGair dehumidifying unit includes the following main models:
•Standard (Large) – DG-12. Available in EU models.
•Small – DG-6. Available in EU models.
•Warm Climate – DG-13
Each of the above models can be configured as follows:
•Split configuration
•With Heating & Cooling
•50 Hz or 60 Hz.
Note
EU models utilize refrigerant gas type R513a.
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Unit Overview
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3.3 Options
The DryGair unit can include one or more of the following options:
•Side/ One-direction Canopy – a canopy that distributes the air in one
or two specific directions.
•Combined Heating and Cooling – a water-based coil for heating or
cooling the air exiting the unit.
•Noise Reduction – an option for adding noise insulation to receive a
quieter unit.
•Protecting Wire-Net – a net for protecting the coil outer fins from
mechanical damage.
•Air Filter – a fine mesh filter for protecting the coils dust and other
small particles.
•Chemical Protective Coating – the unit parts are made of materials
that improve their resistance to chemicals and soil disinfectants.
•Wheels – set of wheels for unit mobility.
For more details on the available options, types, and configurations, see
Chapter 9.
Note
The configuration cannot be changed at the customer’s site.
Unit Overview
Unit Description
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3.4 Unit Description
The following figures show the various external parts of the DryGair unit.
Note
The front and rear views are of different models and configurations.
Air inlet to coils
Removable cover to the
compressor
Door to the electrical
compartment
Temperature and humidity
sensor
Removable cover to the
service compartment:
Coils
Filter driers
Expansion valves
Temperature and
humidity sensor
Fans and air distributor
(4-way canopy)
Figure 3-1. DryGair unit (front view)
Air inlet to coils
Removable cover to the
compressor and the drain
outlet
Removable cover to the
compressor pressure
switches
Air distributor
(side canopy)
Figure 3-2. DryGair unit (rear view)
1
2
3
4
1
2
3
4
5
6
DryGair Dehumidification Unit
Installation
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4. INSTALLATION
The installation chapter includes site preparations, transporting and
unpacking instructions, and installation instructions.
For a video showing parts of the installation procedure, go to
https://www.youtube.com/watch?v=CPvgSqmch-0.
Note
The site should be prepared based on the unit configuration and location
and should be done before unpacking and powering the unit on.
For units combined with Heating or Cooling, see details in Appendix D.1.
For split type units, see details in Appendix D.2
4.1 Site Preparations
4.1.1 Location Considerations
•The DryGair unit should be installed inside a greenhouse and located in
an accessible location for operation and maintenance.
•The unit should preferably be positioned in the center of the greenhouse,
blowing air towards the plants.
•If the unit is placed next to the greenhouse wall, ensure it is distanced at
least 50 centimeters from the wall, and blowing air towards the plants.
•The unit in its final position should be positioned at a height the air
distributor (canopy) is just below the thermal screen (if exists) and the
unit's blowers are above the plants. The air should be distributed to the
center of the greenhouse.
•If the plants growing method is high gutter, the unit should be elevated
on stable designed tables to a height that enables the efficient and safe
operation of the unit.
Installation
Site Preparations
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4.1.2 Required Utilities
Prepare the installation site before receiving the DryGair unit.
•Prepare a concrete leveled surface or tiles, built according to the unit
dimensions and weight (see details in Appendix A and Appendix A).
•Prepare an electrical shut off switch in a protected location near the unit.
Specifications for the shut-off switch are as follows:
DG-12 – 3×40 Amp. DG-12 EU – 3×63 Amp.
DG-6 – 3×24 Amp. DG-6 EU – 3×32 Amp.
DG-13 – 3×63 Amp.
•Prepare drainage for removal of the water that is condensed by the unit.
The unit is supplied with a metal 1½" BSP threaded bushing.
The prepared drainage should include a siphon.
Warning
The unit condensation water is not for drinking!
Note
EU models utilize refrigerant gas type R513a.
•The site should be equipped with suitable climbing equipment to enable
safe and comfortable access to the unit's top.
•The transit lanes inside the greenhouse where the unit is to be installed
must be kept clear, and the floor must be clean and free from any
obstacles that might cause the forklift, truck or crane to “jump”.
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Installation
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4.2 Transporting the Unit
4.2.1 Safety Notes for Lifting and Transporting the Unit
Warning
DryGair declines all responsibility for damage to objects or persons caused
by not observing the safety standards concerning the lifting and moving of
material within the user’s facilities.
•Loading the truck and transporting the unit must be done with the
appropriate equipment, considering the unit size and weight.
Warning
Only qualified and specialized personnel, which are trained for this type of
maneuvering, should perform all the handling and lifting operations.
•When transferring the unit, be sure to have a supervising person.
•Personnel must keep a distance from suspended loads and work areas of
the crane, forklift truck, or other lifting/handling equipment.
•Moving and lifting the unit should be done with suitable belts/chains.
•Always act with extreme caution to prevent personal injury and damage
to the unit or its parts. When using a forklift, be sure not to damage the
compressor.
Caution
The DryGair unit should be lifted only from its front or rear.
A “LIFT” notice is attached to the front and rear panels of the
unit. Ensure the forks are spread sufficiently apart to ensure
the stability of the load.
•When lifting and transporting the unit, the load must always be secured
and fixed to a load-bearing part of the lifting and transporting equipment.
This will ensure no movement, swinging or damage to the unit or its
surroundings.
Notes:
The unit and the air distribution module are shipped separately, wrapped
in bubble wrap, and stretch wrap.
For model weight and dimensions, see details in Appendix A and
Appendix B.
Installation
Transporting the Unit
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4.2.2 Special Instruction for Tilting the Unit
The unit can temporarily be carried in an angle inside the greenhouse under
the following precautions:
Caution
Do not tilt the unit to more than 75 degrees from its vertical position.
Preparing the Unit:
1. Ensure the compressor connecting screws are tightly closed.
2. Secure the compressor:
With a belt to a firm part of the unit structure to avoid overweight on
the compressor's screws.
Or
Place a piece of wood in the gap between the compressor and the unit
side post, to support the compressor's high end.
3. Verify the panels of the unit top fans are mounted well.
4. Protect the coils with polystyrene or plywood.
Caution
If the unit is tilted during its transportation, leave the unit in its vertical
position for at list 3 hours before operating. This will ensure the oil drains
back to the bottom of the compressor.
This manual suits for next models
3
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