GeneralAire DS20 User Manual
Installation, Operating and Maintenance Manual
Read And Save These Instructions
IMPORTANT WARNINGS
BEFORE INSTALLING OR HANDLING THE APPLIANCE PLEASE CAREFULLY READ
AND FOLLOW THE INSTRUCTIONS AND SAFETY STANDARDS DESCRIBED IN THIS
MANUAL AND ILLUSTRATED BY THE LABELS ON THE MACHINE.
This humidifier produces non-pressurized steam using electrodes immersed in the water
contained in the plastic steam generator cylinder. The electrodes pass electrical current through
the water, to produce steam.
The quality of the water used affects the ability of electrical current to pass through the water, so
the appliance may be supplied with untreated water, as long as this is drinkable and not
demineralized. (Use of softened water is not recommended.)
This appliance has been designed exclusively to directly humidify rooms or ducts, using the
distribution system supplied. It is suitable for this purpose as long as: the installation, use and
maintenance operations are carried out according to the instructions contained in this manual and
on the labels applied internally and externally.
The conditions of the environment and the power supply voltage must comply with the specified
values. All other uses and modifications made to the device which are not authorized by the
manufacturer are considered incorrect. Liability for injury or damage caused by the incorrect use
of the device lies exclusively with the user.
Please note that the machine contains powered electrical devices and hot surfaces. All service
and/or maintenance operations must be performed by qualified personnel who are aware of the
necessary precautions and are capable of performing the operations correctly. Disconnect the
machine from the main power supply before accessing any internal parts. Local safety standards
in force must be applied in all cases.
The humidifier is made up of metallic and plastic parts. All parts must be disposed of in
accordance to local standards on waste disposal.
This product is warranted for 2 years from the date of installation, or 2 years and 1 month (see
page 23 and warranty card) from the date of original shipment, whichever comes first. This
warranty does not cover consumable parts, such as the steam cylinder. Full warranty information
is on a separate registration card supplied with this appliance.
WARNING: Your humidifier requires water to operate. Do NOT mount it above materials or
machinery that could be damaged if a leak occurs. General Filters, Inc. assumes no responsibility
for consequential or inconsequential damage as a result of any leaks.
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Installation, Operating and Maintenance Manual
Table of Contents
1: REMOVE HUMIDIFIER FROM BOX AND OPEN............................................................................. 4
2: MOUNTING THE HUMIDIFIER............................................................................................................ 5
POSITIONING.................................................................................................................................................. 5
OUNTING..................................................................................................................................................... 5
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3: STEAM DISTRIBUTION ......................................................................................................................... 6
R
OOM DISTRIBUTION..................................................................................................................................... 6
DUCT DISTRIBUTION...................................................................................................................................... 7
STEAM HOSE INSTALLATION.......................................................................................................................... 7
4: PLUMBING................................................................................................................................................ 9
CONNECT WATER DRAIN...............................................................................................................................9
CONNECT WATER FEED................................................................................................................................. 9
5: POWER WIRING.................................................................................................................................... 10
6: CONTROLS WIRING............................................................................................................................. 11
MOUNT THE HUMIDISTAT............................................................................................................................ 11
MOUNT 12500 AIR PRESSURE SWITCH (DS-20 ONLY)................................................................................ 11
CONNECT HOSES. CONNECT HOSE TO SUPPLY PLENUM PROBE. TRIM HOSE TO
LENGTH AND CONNECT TO HIGH PRESSURE INLET TOWARD REAR OF SWITCH.
CONNECT RETURN PLENUM PROBE TO LOW PRESSURE INLET TOWARD FRONT OF
SWITCH........................................................................................................................................................ 11
WIRE THE CONTROLS .................................................................................................................................. 12
7: START-UP AND SHUT-DOWN ............................................................................................................ 13
FIRST START-UP ........................................................................................................................................... 13
STARTING THE UNIT ..................................................................................................................................... 13
HUT-DOWN................................................................................................................................................ 14
S
8. OPERATING PRINCIPLE AND OTHER FUNCTIONS.................................................................... 15
OPERATING PRINCIPLE ................................................................................................................................. 15
9. ALARMS, TROUBLESHOOTING........................................................................................................ 16
10. MAINTENANCE AND SPARE PARTS.............................................................................................. 18
REPLACING THE CYLINDER ......................................................................................................................... 18
MAINTENANCE OF THE OTHER HYDRAULIC COMPONENTS......................................................................... 18
CLEANING THE FILL VALVE......................................................................................................................... 18
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LEANING THE DRAIN VALVE..................................................................................................................... 19
HYDRAULIC PARTS ...................................................................................................................................... 19
PARE PARTS................................................................................................................................................ 20
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11. WIRING DIAGRAM.............................................................................................................................. 21
12. TECHNICAL SPECIFICATIONS ....................................................................................................... 22
D
IMENSIONS AND WEIGHTS .......................................................................................................................... 22
3
1: Remove Humidifier
From Box And Open
Twist GeneralAire brand badge on the front
cover of the cabinet to uncover the hidden
capture screw underneath the right side.
Remove capture screw using a phillips
screwdriver. (take care not to lose the screw)
Lift cabinet front cover upward about 1” and then
pull forward to remove.
Your Elite Steam humidifier will consist of:
For duct mounted applications:
1 - Steam humidifier unit
1 - Duct steam nozzle
6' - 7/8" ID steam hose
2 - Steam hose clamps
7' - 5/16" ID condensate hose
1 - Condensate hose clamp
1 – 800 UST Saddle valve kit
1 – Wall / Duct Mount Humidistat
1 – 12500 Air Pressure Switch
1 – Water supply tube kit
3 - Screws and anchors
1 - Fill connector
1 – 10’ coil low voltage wire
For room mounted applications:
1 - Steam humidifier unit with blower attached
1 – 800 UST Saddle valve kit
1 – Wall / Duct Mount Humidistat
1 – Water supply tube kit
3 - Screws and anchors
1 - Fill connector
1 – 10’ coil low voltage wire
IMPORTANT: BEFORE beginning installation:
Check for shipping damage to cartons. Mark the shipping waybill accordingly.
Open cartons and check for any hidden damage. Mark the shipping waybill accordingly.
Check packing slip to insure all items have been received. Notify General Filters, Inc. within one
week of any shortages or damaged parts.
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Installation, Operating and Maintenance Manual
2: Mounting The Humidifier
Positioning
The humidifier unit should be mounted as close as
possible to the steam distributor nozzle or blower unit to
minimize steam hose length and condensate losses.
The unit has been designed for wall-mounting, and the
wall must be able to support the weight of the unit in
normal operating conditions (See bottom of page).
The metal cabinet of the humidifier heats up during
operation, and the rear part in contact with the wall may
reach temperatures of over 140°F. Make sure the
humidifier is mounted level and plumb, and that the
minimum clearances, as shown at right, are maintained
to allow room for maintenance operations and ventilation.
Mounting
The humidifier must be wall-mounted using three screws: two upper
screws, for fastening the support bracket, and one lower, central
screw, to fasten the unit into place. To the right is the template for the
mounting holes.
Fasten the bracket supplied with the humidifier to the wall (see
below); making sure that it is level. If the unit is to be mounted to a
block wall, use the plastic screw anchors (5/16”) and screws (3/16” x
2”) supplied.
Hang the humidifier on the bracket using the mating bracket located
on the top edge of the back of the humidifier. Fasten the humidifier
to the wall using the central hole in the rear part of the base; this can
be easily reached from underneath the unit.
Height: 24-3/8”
Width: 14-1/8”
Depth: 10-1/4”
Weight dry: 29.7 lbs.
Weight wet: 36.4 lbs.
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3: Steam Distribution
Room Distribution
The room distribution unit is used to distribute the steam directly into the room, and is supplied
premounted to the top of the humidifier.
The drawing shows the minimum distances required to prevent humidified air from coming into
contact with persons, or surfaces before the steam has been totally absorbed by the air.
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Installation, Operating and Maintenance Manual
Duct Distribution
If a duct steam distribution nozzle is to be used, selected an accessible location on the duct,
allowing at least 18” of straight duct (no elbows or obstructions) after the point where the nozzle will
be installed and the clearances can be maintained as per the following drawings.
To mount the steam distributor nozzle, cut or drill a 2-1/2” hole in the duct. Apply caulk to the
mounting plate of the nozzle. Attach the nozzle to the duct using 4 #10 sheet metal screws
(supplied). Nozzle must be level with condensate outlet to bottom.
Steam Hose Installation
The humidifier must be connected to the distributor nozzle
using the GeneralAire hose supplied or other hose suitable
for use with steam and condensate. The use of unsuitable
tubing may cause weakening and cracking and consequently
steam leaks.
Installation of the steam hose is absolutely critical.
95% of all operational problems are traced back to
improper hose installation.
Steam must flow through the hose, and condensate must flow back. Avoid any kinks, sags or
areas where condensate can become trapped as it will impede the free flow of steam, putting
pressure on the humidifier cylinder.
The steam hose must slope 20% up and away from the humidifier or 5% down and away.
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If necessary, support the steam hose using braces or other
supports. DO NOT try to pipe the steam to two different
ducts or air handlers.
The condensate hose should be trapped as shown in the two
drawings above. This is to prevent steam from flowing
through it. The condensate is wasted, either to the nipple on
top of the humidifier, or to a separate drain. DO NOT put
condensate into the humidifier fill cup.
Hose clamps are provided for the 7/8” I.D. steam hose as
well as for the 5/16” condensate hose. DO NOT reduce the
size of the steam hose, use valves or otherwise restrict
the free steam flow.
WARNING: the length of the steam hose should be less than 12 feet.
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