Pure Humidifier ECDDR Series Operation and maintenance manual

1
Deionized, Demineralized, or Reverse Osmosis Water
“ECDDR” Series
Electric Humidifier
Installation Instructions
—————————————————
Operation and Maintenance Manual
READ AND SAVE THESE INSTRUCTIONS
Our results are comforting
Form No: ECDOM-10-19
PURE HUMIDIFIER® and INTAC® are registered trademarks of PURE Humidifier Co.

1
To the user of PURE Humidifier Co.’s Electric
Humidifiers
We at PURE Humidifier Co. thank you for choosing one
of our quality products. PURE Humidifier Co. Electric
Series Humidifiers are models of simplicity to install,
operate, and maintain. However, they must be
maintained to provide maximum operating efficiency.
PLEASE READ AND FOLLOW ALL
INSTRUCTIONS CAREFULLY. PROPER
OPERATION AND HUMIDITY CONTROL IS
POSSIBLE ONLY WITH PROPER
INSTALLATION AND MAINTENANCE.
The “ECDDR” Series Humidifier is specifically designed
to operate with deionized, demineralized, or reverse
osmosis water. All components that will be in contact
with water are constructed of type 304 stainless steel,
incoloy, or corrosion resistant materials.
Use of mineralized (hard or soft) tap water will cause fill
valve failure and void that warranty. PURE Humidifier
Co.’s “EC” Series should be installed on applications that
require tap water.
High chloride content in feed water can cause chloride
stress cracking and chloride pitting in stainless
components. Chloride stress corrosion cracking (CSCC)
and chloride pitting of stainless steel components is not
covered by warranty. Do not use hydrochloric acid
descalers or bleach to clean the tank. We offer an easy-
to-use, non-toxic descaling solution to help keep your
units clean and operating with maximum efficiency.
Please contact your local PURE Humidifier
representative for more information about our PURE
Clean descaling solution.
To ensure proper installation of this product, it must be
installed by qualified HVAC and electrical contractors,
and must be in compliance with local, state, federal, and
governing codes. If installed improperly this product may
cause damage to property, severe personal injury, or
death as a result of electric shock, burns, and/or fire.
Do not adjust any components inside humidifier control
panel without consulting the factory.
Installation of humidifier in high humidity or salt water
atmospheres will cause accelerated corrosion, resulting
in a reduction of the normal lifespan of the unit.
For indoor use only.
Table of Contents
Introduction 1
Capacity & Electrical Specifications 2
Dimensions & Layout 3
Humidifier Layout 4
Location & Mounting 5
Wall Mounting Detail 6
Dispersion Method 7
Injection Tube and Flexible Hose 8
Steam Piping Examples 9
Piping 10
Blower Pack 11-12
Pre-Startup Checklist 13
Non-INTAC® Startup Procedure 14
INTAC® Startup Procedure 15
Maintenance & Cleaning Instructions 16
Cover Gasket Replacement Instructions 17
Troubleshooting 18
Tool Requirements & Torque List 19
Maintenance Notes 20
Exploded Parts Drawing 21
Parts List 22
Introduction
The PURE Humidifier Co. Warranty
PURE Humidifier Co. guarantees its products to be free from
defects in material and workmanship for a period of one year
from the date of shipment; provided the product is properly
installed, serviced, and put into the service for which it was
intended.
PURE Humidifier Co. is obligated under the terms of this
warranty to the repair or replacement of the defective part(s),
excluding any labor charges, or to refund the purchase price at
our option. PURE Humidifier Co. assumes no obligation for
incidental or consequential damages. The above provisions are
in lieu of all other guarantees, obligations, liabilities or
warranties, expressed or implied.

2
Electrical Specification
“ECDDR” Series
Deionized
Water Unit
Model No.
Steam Output Capacity † Humidifier Weight
Empty Full
lbs/hr kg/hr lbs kg lbs kg
ECDDR-515.0 6.8 139.0 63.1 223.0 101.2
ECDDR-10 30.0 13.6 140.0 63.5 224.0 101.6
ECDDR-15 45.0 20.4 141.0 64.0 225.0 102.1
ECDDR-20 60.0 27.2 142.0 64.4 226.0 102.5
ECDDR-25 75.0 34.0 143.0 64.9 227.0 103.0
ECDDR-35 102.0 46.3 146.0 66.2 230.0 104.3
Capacity & Weights
“ECDDR” Series
Deionized
Water Unit
Model No.
Single Phase Amperage
Control
Circuit
Voltage
Three Phase Amperage
KW
No. of
Heaters 120V 208V 240V 480V 600V
No. of
Heaters 208V 240V 480V 600V
ECDDR-55Single 41.7* 24.0 20.8 10.4 8.3 Triple 13.9 12.0 6.0 4.8 24 vac
ECDDR-10 10 Double 41.7 20.8 16.7 Triple 27.8 24.1 12.0 9.6 24 vac
ECDDR-15 15 Triple 31.3 25.0 Triple 41.7 36.1 18.1 14.4 24 vac
ECDDR-20 20 Triple 41.7 33.3 Triple 24.1 19.2 24 vac
ECDDR-25 25 Triple 41.7 Triple 30.1 24.1 24 vac
ECDDR-35 34 Triple Triple 40.9 32.7 24 vac
* ECDDR-5 at 120/1 requires 3 heating elements.
† The above capacities are based on 100% efficiency. Actual humidifier capacity may vary due to the heat loss
from the humidifier reservoir. The ambient air temperature, air velocity, and injection tube system will affect
the rate of heat loss from the humidifier reservoir.
Capacity & Weights
Electrical Specifications

3
PURE
Company
Humidifier
FRONT VIEW
6 1/2"
Reservoir Drain Outlet
Ø1 7/8"
Cabinet Overflow
1/2" NPT
Water Inlet 3/8" NPT
24"
Removable Key Locked
Reservoir Access Door
TOP VIEW
29 1/2"
Access Plate*
PURE
Company
Humidifier
14.75”
(37.5)
17.00”
(43.2)
7.75”
(19.7)
29.50”
(74.9)
Removable
Access Plate*
2 3/8” Steam
Outlet Access
TOP VIEW
24”
(60.9)
Removable Key Locked
Reservoir Access Door Operation Status
Indicating Lights
FRONT VIEW RIGHT SIDE
VIEW
BOTTOM VIEW
Key Locked
Electrical
Access Door
Reservoir Drain Outlet
1 7/8”Ø 2.375”
(6.0)
8.4375”
(21.4)
15.00”
(38.1)
2.00”
(5.1)
1.50”
(3.8)
Cabinet Overflow
1/2” NPT
Water Inlet 3/8” NPT
Electrical Inlet 1 1/8ӯ
Note: Dimensions are typical for all ECDDR models.
6.50”
(16.5)
*Removable access plate allows reservoir to
slide out for inspection and cleaning without
disconnecting the steam supply piping.
**See local codes for minimum clearance to
electrical compartment. The electrical access
door requires a minimum clearance of 16" to
fully open.
16”
(40.6) Key Locked Electrical
Access Door **
Dimensions & Layout

4
Humidifier Features
• SCR modulating control
• Visible status and diagnostic LED indicator lights
• Stainless steel float type water makeup valve
• Low water cut-off float switch
• High-efficiency incoloy immersion water heaters
• 18-gauge steel cabinet with baked enamel paint
finish
• Internal stainless steel evaporating reservoir
mounted on slides for easy removal
* Optional features
• Key locked doors for both reservoir and electrical
access
• Easy and simple installation options
• Dispersion methods include Insty-Pac*, Fast-Pac*
Injection Tube*, or Blower Pack assembly* for
room distribution
• Manual reset over-temperature safety switch
• INTAC® microprocessor control system*
• VAV dual modulating control system.*
1/2" NPT Reservoir
Overflow (By Others)
3/4" Drain Piping
(By Others)
6 1/2"
2 3/8"
Reservoir Drain Outlet
Ø1 7/8"
Cabinet Overflow
1/2" NPT
1 1/2" 2"
8 7/16"
15"
Water Inlet 3/8" NPT
Electrical Inlet Ø1 1/8"
BOTTOM VIEW
Open Sanitary
Drain
Float Ball
Water Valve
Float Ball
Water Valve
Immersion
Heaters
Removable
Humidifier
Reservoir
Removable
Humidifier
Cover
Over-Temperature
Switch
Steam Outlet
Connection
Operating Status
Indicating Lights
Removable Key Locked
Reservoir Access Door
Humidifier Layout

5
Location
The location selected must provide for electrical service,
cold or hot water supply, and sanitary drain.
When selecting a location, try to keep the humidifier
within 10 feet (305 cm) of the duct to avoid unnecessary
heat losses, condensation within the steam supply line
and excessive pressure buildup in the reservoir.
Visible “fog” will saturate and condense when it contacts
objects such as turning vanes, filters, fans, elbows, or
take-offs. The warmer the air, the more easily it will
dissipate the visible steam. The most active and warmest
portion of the duct will provide better mixing of the steam
and air. The injection tube should be mounted a
minimum of 2 feet (61 cm) downstream from an elbow or
other uneven air flow area.
Avoid mounting single-style injection tube(s) closer than 8
-10 feet (244-305 cm) upstream of objects that could
become saturated and condense the steam (reference
paragraph above). If the duct layout does not provide a
straight, unobstructed run of 8-10 feet (244-305 cm), a
multiple injection tube system should be considered to
reduce the visible steam travel distance.
For Fast-Pac and Insty-Pac multiple tube assemblies
please consult factory for job specific non-wetting
distances.
Reference Fast-Pac or Insty-Pac O&M’s for full
installation details.
CAUTION: Do not humidify upstream of filters. Consult
factory.
CAUTION: Smoke detectors should not be located
downstream of injection tube assemblies.
Location of Control Sensors
It is important to avoid mounting any control sensors
within the visible steam. The control sensors should be
mounted a minimum of 8-10 feet (244-305 cm)
downstream from the humidifier injection tube. Due to the
temperature rise that exists within the visible steam
dissipation area, thermostats should not be mounted near
the injection tube. High-limit humidistats should be
installed before any duct obstruction to make sure the
humidifier is interrupted before saturation can occur on
the object. The high-limit should be mounted a minimum
of 8-10 feet (244-305 cm) downstream from the injection
tube. Installing the high-limit closer than 8 feet (244 cm)
from the humidifier may cause erratic control.
Mounting
Mounted from the wall. The humidifier should be mounted
dead level in both directions. PURE Humidifier Co.
supplies the wall mounting bracket. Bracket is mounted to
wall studs first. The bracket must be mounted to wall
studs or additional support must be provided in the field.
ECDDR cabinet is then hung on the slip-fit bracket.
Drain Pan Mounting
A drain pan is an additional safety feature which may be
required to be supplied in the field. In a proper humidifier
installation, a drain pan is not required. However, if the
humidifier and injection tube are located in an area that
contains valuable equipment or is a water sensitive area,
PURE Humidifier Co. recommends the addition of a drain
pan under the humidifier and under the injection tube. The
drain pan should extend past all edges of the humidifier
and if installed in the duct, it should extend a minimum of 3
feet (91 cm) downstream from the injection tube. The pan
should be of a size which is sufficient to retain sudden
drainage of the humidifier’s contents. The pan should be
drained to a sanitary drain.
Injection Tube Installation
Single tube units should have the injection tube installed in
the center of the duct. Multiple tube units should have the
tubes staggered within the duct. See Injection Tube and
Flexible Hose Installation on page 8 for details.
Injection tube should be pitched 2 inches (5 cm) per foot
(31 cm), back to the humidifier. If proper pitch cannot be
maintained, or the injection tube is mounted lower than the
humidifier, a drain “tee” will be required.
Install the tube with the steam ports injecting steam up.
NOTE: If narrow ducts (6”/15 cm or less, in height) are
utilized, install the tube with the steam ports injecting with
the air flow slightly (2 o’clock position).
Galvanized steel duct plates are provided to seal the
opening where the tube enters the duct.
Multiple Injection Tube Assemblies
See page 9 for details.
Location & Mounting

6
Wall Mounting Detail
Mounting
The humidifier should be mounted dead level in both directions. PURE Humidifier
Co. supplies a wall mounting bracket. Bracket is mounted to wall studs first. The
bracket must be mounted to wall studs or additional support must be provided in the
field. ECDDR cabinet is then hung on the slip-fit bracket.
1/4"Ø Typ.
11/16" 4"
Typ. 3/4"
3 7/8"
HANGER BRACKET HOLE DETAIL
FRONT VIEW
21 3/8"
6"
4"
2"
EDGE OF EC HUMIDIFIER CABINET 17"
RIGHT SIDE VIEW
A
A
WALL
WALL SUPPORT
WELDED TO
BACK OF CABINET
DETAIL
A - A
HANGER BRACKET
BOLTED TO WALL
WALL BRACKET
WELDED TO
BACK OF CABINET

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Injection Tube and Flexible Hose
Allows remote mounting of the humidifier
reservoir from the duct. Also allows the
humidifier to be located below a wall-
mounted duct. See page 8 for details.
Insty-Pac and Fast-Pac
Multiple Injection Tube Assemblies
For applications where you need a short
dissipation distance. Allows remote
mounting of the humidifier reservoir from
the duct. Also allows the humidifier to be
located below a wall-mounted duct. See
page 9 for details.
Blower Pack for Direct Room Humidification
Allows humidifier to be mounted directly on
the wall within the space to be humidified.
See page 11 and 12 for details.
Dispersion Method

8
Installation
Injection tube shall be installed in the center
of the duct. Hose and injection tube should
be pitched back to the humidifier two inches
(5 cm) per foot (31 cm). If proper pitch cannot
be maintained, or the injection tube is
mounted lower than the humidifier, a drain
"tee" will be required (reference drain "tee"
illustration).
Install the tube with the steam ports injecting
steam up. NOTE: If narrow ducts (6”/15 cm
or less, in height) are utilized, install the tube
with the steam ports injecting slightly with the
air flow (2 o’clock position).
The hose connects to the injection tube and
humidifier with stainless steel hose clamps
(by PURE Humidifier Co.).
Galvanized steel duct plates are provided to
seal the opening where the tube enters the
duct.
“H”
Water
Seal
Height
Total KW
5 thru 20
21 thru 34
“H”
6” (15 cm)
8” (20 cm)
Typical “ECDDR” Series
Electric Humidifier
3/4” SW Condensate
drain line (by others)
Δ The water seal height may have
to be increased if excessive duct
static pressure exists.
Open Sanitary
Drain
Water Seal Height Δ
Flexible Hose
Stainless Steel
Drain Tee
(optional) Duct (beneath
humidifier)
Flexible Hose
Pitch 2” (5 cm) per foot (31 cm)
back to the humidifier.
Duct Plate
Injection Tube
Pitch 2” (5 cm) per foot (31 cm)
back towards the humidifier.
Duct
Typical “ECDDR” Series
Electric Humidifier 4” Insertion Length/
Duct Width
8”
Tube Detail
1 1/2ӯ
Injection Tube and Flexible Hose

9
Pitched Towards Steam Generator
and Tube Assembly
1/4”/1’
2”/1’
Pitch
(see Note 1)
2”/1’
Notes:
1. Pitch hard piping or flexible hose 2" per foot if steam is flowing uphill, 1/4" per foot if the steam is flowing
downhill. Reference piping examples shown.
2. When feasible to do so, install a minimum one-foot riser from the top of the tank to reduce condensate carry
over.
3. Use flex connectors or unions to allow for easy removal of cover.
4. Support flexible hose every 18" to avoid sagging.
5. Hard piping or flexible hose must match reservoir outlet size. Do not use supply piping with a smaller inside
diameter than the reservoir outlet.
6. Failure to follow the piping recommendation on this page may result in blown water seals, leaking cover
gasket or dispersion tubes spitting.
7. Install a Drain Tee at any low spots in supply piping run where condensate will accumulate. All horizontal to
vertical up transitions require a water-sealed drip leg.
8. Reference job specific tube assembly O&M included with your order for complete details.
Pitched Towards Tube Assembly
Pitched Towards Drain Tee
Drain Tee
(see Note 8)
1/4”/1’ 2”/1’
1/4”/1’
Use two 45° elbows or
hard piping or wide 90° for
flexible steam hose
Supply piping
connectors
(see Note 4)
Steam Supply Piping Examples
see Note 2
Typical
Humidifier
Reservoir
Pitched Towards Steam Generator

10
Drain Piping
The “ECDDR” style humidifier requires one 3/4” and
one 1/2” stainless steel drain piping connections run
to an open drain.
The drain piping should be stainless steel. The use of
PVC piping is not recommended; the humidifier water
temperature may cause the PVC to soften and fail.
Use a drain tempering kit before transition to PVC.
The “ECDDR” humidifier has a factory-piped internal
water seal. Prime water seal prior to operation by
removing the overflow hose and pouring water into it.
Re-attach the overflow hose and tighten hose clamp.
If gravity drain is not possible please use a
condensate pump rated for 212°F water or contact a
PURE Humidifier Co. representative to purchase one.
Typical “ECDDR”
Series Humidifier
(Right Side View)
3/4” Drain
Open Sanitary
Drain
3/8” NPT Water Inlet
WARNING:
Humidifier Reservoir Drain and Cabinet
Overflow Drain (see page 3) MUST be run
separately. These lines CANNOT be tied
together into a common drain line. Draining
malfunction will occur causing damage to the
humidifier system.
Cabinet Overflow
Drain
VIEW
(By Others)
1/2" NPT Reservoir
Overflow (By Others)
3/4" Drain Piping
(By Others)
6 1/2"
2 3/8"
Reservoir Drain Outlet
Ø1 7/8"
Cabinet Overflow
1/2" NPT
1 1/2" 2"
8 7/16"
15"
Water Inlet 3/8" NPT
Electrical Inlet Ø1 1/8"
BOTTOM VIEW
Steel Drain
Open Sanitary
Drain
Piping
Water Supply Piping
Supply pressure: 35-50 psi
This style humidifier utilizes a float-operated fill valve
system which is designed for use with deionized,
demineralized, or reverse osmosis water. Use of
mineralized tap water will cause fill valve failure and
will void the humidifier warranty.
Install stainless pipe on makeup water line within 5
feet of humidifier fill valve connection. If plastic pipe is
used beyond this point a check valve is required to
prevent steam from entering the plastic section in the
event that the water treatment system runs out of
water.
Cold or hot deionized, demineralized, or reverse
osmosis water can be supplied to the humidifier. A
minimum water pressure of 35 psi (2.4 Bar) should be
maintained to provide the proper water level within
the humidifier. DO NOT exceed the maximum
acceptable water pressure of 50 psi (3.5 Bar). If the
water pressure is above 50 psi (3.5 Bar) a pressure
reducing valve should be installed. Failure to do so
will cause the supply water hose to burst due to
excessive heat and pressure.
The humidifier has a factory built-in 1.5” (4 cm) air
gap between the water inlet and the overflow. Local
codes should be checked to see if the addition of a
vacuum braking device is required. Water connection
is made at the bottom of the humidifier with 3/8” NPT
piping.

11
Optional Blower Pack
In applications where a ducted air system is not
available, PURE offers the optional Blower Pack.
The Blower Pack contains a two-speed
adjustable blower that moves the air over the
steam discharge outlet and disperses the steam
directly into the space (see Fig. 1). The Blower
Pack mounts directly on top of the “ECDDR”
humidifier or can be remote mounted (see Fig.
2).
Locating Blower Pack
The distance that visible steam will travel after
leaving the Blower Pack is dependent upon the
relative humidity in the room and the capacity of
the humidifier. If this visible steam comes in
contact with any solid object (walls, beams,
machinery, etc.), it may form condensate and
drip. Refer to Fig. 3 and Table 4 (Table 4 is
located on page 12) for data on visible steam
travel. This will aid you in planning the location
of the Blower Pack.
Remote Mounting
The Blower Pack may be remote-mounted up to
ten feet away from the “ECDDR” wall mount
humidifier (see Fig. 2).
Blower Pack Air is drawn
into Blower Pack
Steam is discharged
directly into space
“ECDDR” Wall Mount Humidifier
“ECDDR” With Optional Blower Pack
Fig. 1
Visible Rise and Throw
Fig. 3
Remote-Mounted Blower Pack
Fig. 2
Remote Blower Pack
“ECDDR” Humidifier
Throw
Rise
Blower Pack
6” Water Seal

12
Locating Blower Pack
The distance that visible steam will travel after leaving the Blower Pack is dependent upon the relative
humidity in the room and the capacity of the humidifier. If this visible steam comes in contact with any
solid object (walls, beams, machinery, etc.) it may form condensate and drip. Refer to Fig. 3 (Fig. 3 is
located on page 11) and Table 4 for data on visible steam travel. This will aid you in planning the loca-
tion of the Blower Pack.
Visible Steam
Rise & Throw
Humidifier Model
ECDDR-5ECDDR-10 ECDDR-15 ECDDR-20 ECDDR-25 ECDDR-35
50%
RH
Rise (ft) 1’ 2’ 3’ 4’ 5.5’ 8’
Throw (ft) 8’ 10’ 13’ 16’ 18’ 23’
Rise (ft) 2’ 3’ 4’ 5’ 6’ 8’
60%
RH Throw (ft) 13’ 14’ 16’ 18’ 20’ 25’
Throw is the horizontal distance the visible steam travels from the steam discharge.
Rise is the vertical distance the visible steam travels from the steam discharge.
Objects in the direct line of the visible steam or objects that are cooler than the ambient temperature may
accumulate condensation.
Note: Data above based on 70°F room temperature.
Table 4
Optional Blower Pack Dimensions
Fig. 5
Blower Pack weight is 60 lbs (27.2 kg)
* Blower requires a separate 120/1 circuit (by others)
Blower Pack
296/435 CFM Fan
120/1/60*, 2.17 amps
1/15 HP
17”
(43.18)
7.75”
(19.6)
Left Side View Front View
15”
(38.1)
29.50”
(74.93)
14.75”
(37.47)
1/4” NPT Drain Connection
Steam
Discharge
Steam Inlet

13
Pre-Startup Checklist
Pre-Startup Checklist
Before starting the “ECDDR” PURE Humidifier Co. Electric Humidifier, check the following installation
items:
______ 1. MOUNTING - Verify that the humidifier evaporating chamber is securely supported and that the
evaporating chamber is level in both directions.
______ 2. INJECTION TUBE - Verify that the humidifier injection tube is mounted within the duct with the proper
pitch back to the humidifier (2”/5 cm per foot / 31 cm). NOTE: If the humidifier evaporating chamber or
the flexible hose (optional) is mounted higher than the injection tube, a drain “tee” is required to drain
the condensate out of the injection tube steam line. If it is an Insty-Pac or Fast-Pac, refer to the
respective O&M to determine if they are mounted properly and have the proper p-trap size.
______ 3. ELECTRICAL - Verify that all wiring connections have been connected in accordance with the wiring
diagram. CAUTION: Live power may exist in the control cabinet. Turn off the main power at the
disconnect switch before verifying the electrical connections!
______ 4. SAFETY CONTROLS – The supply air duct RH high-limit should be installed at least 10 feet
downstream from the humidifier tube(s). Any other control sensors should be at least 10 feet
downstream from the humidifier tube(s). Smoke detectors should not be installed downstream of the
humidifier tube(s). If a smoke detector absolutely has to be installed downstream from the humidifier
tubes then it should be installed as far from the tubes as possible.
_____ 5. PIPING: Water Supply - Verify that all piping connections have been completed as recommended and
that water pressure is available to the humidifier. Verify that the supply water pressure is 35-50 psi.
There should be at least 5 feet of metal pipe and check valve between the tank and any plastic pipe.
_____ 6. RESERVOIR: Remove internal packaging around the float ball assembly before starting unit. Failure
to do so can result in the over-heating of the humidifier and potential fire.
_____ 7. PIPING: Steam Outlet - Refer to attachment for proper outlet steam piping from the generator to the
tube(s). Any horizontal to vertical transition in the outlet steam pipe requires a water-sealed
drip leg! Improper outlet steam piping will cause steam to leak from the steam generator. Runs over
20 feet long may require upsizing of the steam pipe.
Signature:__________________________ Date:_________

14
Non-INTAC® Startup Procedure
Start Up Procedure
______ 1. Prime water seal by removing overflow hose and adding water. Replace and tighten hose clamp.
______ 2. With the power “off”, set the switch on the control board to the “Standby” position (the control board is
located within the humidifier control panel door).
______ 3. Close the humidifier manual ball valve (located inside the humidifier evaporating chamber compartment).
______ 4. Turn the controlling humidistat to the lowest setting (no call for humidity).
______ 5. Turn the electric power “on” to the humidifier. The “Power” LED light on the controller should be illuminated.
______ 6. Set the switch on the control board to the “Normal” position.
______ 7. Open the water supply valve (by others) and allow the humidifier evaporating chamber to fill to the proper
level.
______ 8. Make sure all the optional safety switches are satisfied (airflow proving switch, high-limit humidistat, etc.).
______ 9. After the humidifier is full of water, the “Water Level Full” LED will illuminate. Turn humidistat up to call for
humidifier demand.
______ 10. The heater(s) should energize on a call from the humidistat.
______ 11. Verify the low water safety circuit by closing the water supply and opening the manual drain valve. As the
humidifier tank is draining, the “Water Level Full" light should go out and you should hear the contactor drop
out when the low water level is reached; this indicates the low water safety circuit is operational. This should
only take a couple of minutes maximum.
______ 12. Close the drain valve and open the water supply, allow the humidifier to fill to the proper level.
______ 13. Check operation of optional field-installed safety switches (airflow proving switch, high-limit humidistat, etc.)
to make sure that they turn the power off to the control circuit. The safety switches should shut-off the
humidifier heaters whenever one or more of the optional safety switches create an “open circuit”.
______ 14. Check heater amperage draw by testing and recording voltage and amperage in each phase. Readings
should match the factory heater nameplate.
Amps A:_______ Amps B:______ Amps C:______
______ 15. Inspect installation for leaks by operating humidifier at a full rolling boil. This may take up to 15 minutes from
a cold start. Any leaks should be sealed. Just tightening a pressure clamp will not work if the gasket is not
properly positioned between the sealing surfaces. If necessary, remove the cover, reseat gasket and
replace cover. A small amount of adhesive (super glue, gorilla glue, spray adhesive, etc.) to hold the gasket
in place while repositioning the cover will aid in this process.
______ 16. After the unit is producing steam, check and retighten all hose clamp connections in the system and make
sure they are torqued to 35-40 in-lbs. There are two clamps on the fill line, two on the drain line and two on
the steam connections. There may be more located on the steam tube assembly (if used).
Signature:__________________________ Date:_________

15
INTAC® Startup Procedure
Signature:__________________________ Date:_________
Startup Procedure
_____ 1. Prime water seal by removing overflow hose and adding water. Replace and tighten hose clamp.
_____ 2. Make sure the electric power to the humidifier is shut off.
_____ 3. Close the humidifier manual drain ball valve (located on the right side of the humidifier evaporating
chamber).
_____ 4. Open the water supply on/off isolation valve provided by others and allow the humidifier evaporating
chamber to fill to the proper level.
_____ 5. Turn the electric power “on” to the humidifier. The display on the INTAC® controller should illuminate
“Normal Operation”.
_____ 6. Set menu 101 “RH Setpoint” to the lowest setting (no call for humidity). If 100 menu shows “No Parameters
Available” the procedure must be done through the Building Management System.
_____ 7. After the humidifier is full of water, menu 004 will read “FULL”.
_____ 8. Verify the low water safety switch by closing the water supply, opening the drain valve and verifying that the
low voltage pilot relay within the control cabinet de-energizes when the water level is dropped below the
low water shut off switch (you can hear the relay switch “out”). Menu 004 should now read “LOW”; this
indicates that the low water safety circuit is operational. The pilot relay opening would shut down the
heating element contactor when the contactor is energized.
_____ 9. Close the drain valve, open the water supply valve, and allow the humidifier to fill to the proper level.
_____ 10. Make sure all the optional safety switches are satisfied (airflow proving switch, high-limit humidistat, etc.).
_____ 11. Turn menu 101 “RH Setpoint” up to a call for humidity. If a Building Automation System is controlling the
humidifier have it call for 100% demand. For Building Automation System verify 0% and 100% demands
are displayed as 0% and 100% on the INTAC® display and adjust the input high and low values to match
accordingly.
_____ 12. Check operation of optional field-installed safety switches (airflow proving switch, high-limit humidistat, etc.)
to make sure that they turn the power off to the low voltage pilot relay. The safety switches should shut off
the contactor when one or more of the optional safety switches create an open circuit.
_____ 13. Check heater amperage draw by testing and recording voltage and amperage in each phase. Readings
should match the factory heater nameplate.
Amps A:_______ Amps B:______ Amps C:______
_____ 14. Inspect installation for leaks by operating humidifier at a full rolling boil. This may take up to 15 minutes
from a cold start. Any leaks should be sealed. Just tightening a pressure clamp will not work if the gasket
is not properly positioned between the sealing surfaces. If necessary remove the cover and reseat the
gasket. A small amount of adhesive (super glue, gorilla glue, spray adhesive, etc.) to hold the gasket in
place while repositioning the cover will aid in this process.
_____ 15. After the unit is producing steam, check and retighten all hose clamp connections in the system and make
sure they are torqued to 35-40 in-lbs. There are two clamps on the fill line, two on the drain line, and two
on the steam connections. There may be more located on the steam tube assembly (if used).

16
PURE Humidifier Co. “ECDDR” Maintenance Instructions
The “ECDDR” Series Electric Humidifier is practically maintenance-free. However, the humidifier should
be inspected and placed on a dedicated maintenance schedule to ensure continued operation of the
humidifier and its accessories. PURE Humidifier Co. recommends that the following items be in-
spected, and/or, cleaned on a minimum basis of twice a year. If excessive mineral buildup occurs,
the maintenance schedule should be increased.
Inspect/Maintenance Item
Water makeup float valve
Low water float switch
Safety interlocks
(air flow, high-limit)
Immersion heaters
Humidifier cover/tank
Flexible hose
Procedure to Follow
Check to make sure the fill valve is operating
properly. If the valve appears to continually fill,
check the valve adjustment or valve seat and seal
(see Troubleshooting instructions).
Check to make sure the switch will shut the
humidifier off when the water level drops too low.
Open the drain valve to allow water to drain out for
checking purposes. Make sure to reset the drain
valve after inspection is completed.
Check to make sure the safety interlocks (airflow,
high-limit, etc.) will shut down the humidifier.
Verify the correct amperage is being drawn by the
heating element. Reference the wiring diagram
for correct amperage.
Inspect for any leaks. Repair as required.
Remove the heater assembly and remove mineral
deposits from floor of the humidifier reservoir. If
excessive mineral buildup is found, the cover may
need to be removed to facilitate complete cleaning
of the humidifier.
Inspect for cracks or leaks. It is normal for the
hose to become hard and develop a “set”.
Maintenance & Cleaning Instructions
Cleaning Instructions
All humidifier tanks should be cleaned manually from the reservoir cover. Turn off the water supply,
disconnect controls by unplugging the molex in the small octagon box, disconnect power wire from
contactor and remove conduit connection from cabinet, disconnect all the hose connections from the
tank and slide the tank out of the cabinet. Remove all loose solids with a wet vacuum, stainless steel
brush, scouring pad, putty knife and/or bucket. Heaters should also be cleaned and loose buildup
removed by hand (if applicable). After removal of solids and replacing the cover you may wish to add
a de-scaling solution. DO NOT use Hydrochloric acid-based de-scalers; this will corrode stainless
steel. PURE Humidifier Co. recommends the use of a vinegar, citric acid, diluted phosphoric acid or
diluted nitric acid-based cleaner. Follow all precautions on the cleaner packaging. Some cleaners will
give off overwhelming and noxious odors, so make sure there is proper ventilation in the working area
and the steam outlet pipe is removed so that fumes are not spread throughout the building. After
cleaning the tank, flush the tank multiple times to remove any remaining acid. Drain tank completely
and allow the tank to air dry for a few hours. This will ensure that the outer protective layer of the
stainless steel will passivate and ensure corrosion resistance.

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Cover Gasket Replacement Instructions
Remove the reservoir cover. While looking at the top of the unit, reference Figure A and B to determine
which humidifier tank style you have.
Figure A Installation
Fit the gasket around the entire lip of the tank opening. Cut the gasket 1/8” longer than required, this will
ensure proper fit when the cover is clamped back on. Slide the gasket onto lip of tank around the entire
perimeter, and seal the ends together with a small amount of silicone.
Figure B Installation
Fit the gasket around the entire lip of the tank opening. Cut the gasket 1/8” longer than required, this will
ensure proper fit when the cover is clamped back on. Slide the gasket onto lip of tank around the entire
perimeter. Notch only the bottom flap of the gasket (reference Fig. C) in the corners of the tank. Seal the
ends together with a small amount of silicone.
Fig. A
Plan View of Humidifier
Fig. B
Plan View of Humidifier
Section View of Gasket
Gasket Bottom
Notch here
Bottom View of Gasket
Notch gasket bottom only
Gasket Top
DO NOT NOTCH
Fig. C

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Problem
Humidifier will not heat
Humidifier will not fill
Humidifier will not stop
filling or is short cycling
Possible Cause
Blown heater fuse(s)
Control transformer not
producing 24 vac control
voltage
Safety controls open
(air flow switch, high-limit, etc.)
Over-temp switch
Faulty humidity sensor
Faulty immersion heater
No water pressure
Drain valve open
Fill valve stuck closed
Fill valve stuck open
Drain valve open
Recommended Action
Check and replace.
Check transformer output and verify voltage.
Verify that all safety controls are completing the
safety circuit.
The level control circuit has interference or is
damaged. Mineral on low water float switch
may be preventing the switch from opening on
low water condition. Consult factory if you are
unsure of the source of the problem.
Verify voltage to and from humidity sensor.
Check and verify heater voltage and amperage.
Compare to diagram or nameplate label
ratings.
Check water supply.
Close drain ball valve.
Check float valve seat for dirt.
Check float valve seat for dirt.
Adjust float ball arm.
Close drain ball valve.
Troubleshooting

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Recommended Maintenance Tool List
7/16” Wrench or Socket
5/8” Wrench
5/32” Nut Driver or Socket
5/16” Nut Driver or Socket
11/32” Nut Driver or Socket
3/8” Nut Driver or Socket
5/32” Allen head
Flat head screwdriver
Wire stripper
Wire crimper
Pipe Wrench
Tool Requirements & Torque List
Torque List
Cover Bolts 18 inch/pounds MAX
Hose Cuff Screws 35-40 inch/pounds MAX when hot
Heater Nut 18-20 foot/pounds*
Heater Electrical Terminal 35 inch/pounds
* Use a pliers to hold heater sheath from twisting.
Cover
Heater Fiber Gasket
Heater Nut
Electrical Terminal Nuts
Metal Washer
Heating Element Sheath
Isolator
Heater Assembly Sectional Detail