TM
Sheet No.
ESDDR-1
Deionized, Demineralized, or Reverse Osmosis Water
“ESDDR” Series
Electric Humidifier
Since the water mineral build-up does not occur
with pure water, there is no need for an
automatic drain system or cleaning. These units
are practically maintenance-free.
The “ESDDR” Series Electric Humidifier from PURE
Humidifier Co. is loaded with features and options.
All you need is deionized, demineralized, or reverse
osmosis water, electricity, and a sanitary drain. The
humidifier does the rest.
When it comes to installation, you have a choice
with the “ESDDR” Series Electric Humidifier.
The humidifier can be free-standing with a
simple (optional) flexible hose connecting the
unit to the stainless steel injection tube inserted
through the duct wall. You can also mount the
unit on the wall with wall brackets, or floormounted with support legs (both optional). For
mounting under a duct, you simply need
hangers and support brackets.
These units are designed to operate with absolutely
pure water, which is corrosive and will not conduct
electricity. They feature special stainless steel
construction with special assembly techniques to
assure corrosion-resistant joints.
The water level is maintained with a special float
valve to control the water level (instead of the TriProbe electronic water level controller that is utilized
on the “ES” Series). A low water cut-off switch is
utilized to protect the heating elements. Both floats
are protected from water turbulence by an internal
baffle.
Since the reservoir’s water level is
automatically and constantly adjusted, there is no
downtime; steam is always available.
These humidifiers can also be mounted inside
the air handling system (local codes may require
moisture-proof
construction
of
certain
components).
Fast-Pac or Insty-Pac tube
assemblies can be provided for short dissipation
in any built-up or manufactured air handling
system.
A control panel with a microprocessor controller
mounted on the panel door constantly monitors the
humidifier cycle for efficient operation.
The
microprocessor controller also provides a vacuum
fluorescent display to indicate the status of the
humidifier. High efficiency immersion water heaters
(up to twelve) heat the water to provide steam.
Furthermore, a water overflow safety pipe is
standard on all “ESDDR” units.
The versatility of the “ESDDR” Series Electric
Humidifier will allow you to design them into any
system simply, efficiently, and reliably.
Our results are comforting
PURE HUMIDIFIER® and INTAC® are registered trademarks of PURE Humidifier Co.
7-15
Model
Capacities & Weight
Sheet No.
“ESDDR” Series
ESDDR-2
Humidifier Reservoir Weight*
Empty
Full
Steam Output Capacity †
Control Cabinet
Weight ∆
lbs/hr
kg/hr
kg
lbs
kg
lbs
kg
9.0
4.1
KW
3
lbs
ESDDR-3
50.5
22.9
130.5
59.2
32.0
14.5
ESDDR-4.5
13.5
6.1
4.5
50.5
22.9
130.5
59.2
32.0
14.5
ESDDR-5.5
18.0
8.1
6.0
50.5
22.9
130.5
59.2
32.0
14.5
ESDDR-7.5
22.5
10.2
7.5
50.5
22.9
130.5
59.2
32.0
14.5
ESDDR-11
31.5
14.2
10.5
50.5
22.9
130.5
59.2
32.0
14.5
ESDDR-14
40.5
18.4
13.5
50.5
22.9
130.5
59.2
32.0
14.5
ESDDR-15
45.0
20.4
15
50.5
22.9
130.5
59.2
32.0
14.5
ESDDR-16.5
49.5
22.5
16.5
50.5
22.9
130.5
59.2
32.0
14.5
ESDDR-19.5
58.5
26.5
19.5
50.5
22.9
130.5
59.2
32.0
14.5
ESDDR-22
63.0
28.6
21
61.0
27.7
177.0
80.3
55.0
25.0
ESDDR-28
81.0
36.7
27
61.0
27.7
177.0
80.3
55.0
25.0
ESDDR-30
90.0
40.8
30
61.0
27.7
177.0
80.3
55.0
25.0
ESDDR-33
99.0
45.0
33
61.0
27.7
177.0
80.3
55.0
25.0
ESDDR-39
117.0
53.1
39
61.0
27.7
177.0
80.3
55.0
25.0
ESDDR-42
126.0
57.2
42
61.0
27.7
177.0
80.3
55.0
25.0
ESDDR-45
135.0
61.2
45
65.5
29.7
181.5
82.3
72.0
32.7
ESDDR-49.5
148.5
67.4
49.5
65.5
29.7
181.5
82.3
72.0
32.7
ESDDR-58.5
175.5
80.0
58.5
65.5
29.7
181.5
82.3
72.0
32.7
ESDDR-63
189.0
85.7
63
65.5
29.7
181.5
82.3
72.0
32.7
ESDDR-66
198.0
89.8
66
88.0
39.9
243.0
110.2
72.0
32.7
ESDDR-78
234.0
106.1
78
88.0
39.9
243.0
110.2
72.0
32.7
ESDDR-84
252.0
114.3
84
88.0
39.9
243.0
110.2
72.0
32.7
ESDDR-102
306.0
138.8
102
88.0
39.9
243.0
110.2
72.0
32.7
* When calculating the total dry weight of the humidifier, the control cabinet weight must be added to the reservoir weight.
∆ The control cabinet is shipped loose unless optional factory mounting is specified. Reference the “Dimension Sheet” for
control cabinet dimensions.
† 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.
Dimensions & Layout
Sheet No.
“ESDDR” Series
ESDDR-3
NEMA– 12 Humidifier Control Cabinet
(reference control cabinet notes)
“E”
“B”
“D”
1.
2.
3.
Door has been removed from the
drawing for clarity.
Control cabinet is shipped loose for
field mounting unless optional factory
mounting is specified.
Dimension “F” = Control cabinet depth.
3.87”
(9.8)
Top View
Steam Outlet Connection
(size and qty. will vary with application)
3.625”
(9.21)
“C”
9.0”
(22.9)
Front View
Right Side View
Unit Dimensions
Dim. “A”
Model
1.04”
(2.6)
“A”
Control Cabinet Dimensions
Dim. “B”
Dim. “C”
inches
cm
inches
cm
inches
cm
ESDDR-3 thru 19.5
17.68”
44.9
16.21”
41.2
13.84”
35.2
ESDDR-22 thru 63
25.68”
65.2
16.21”
41.2
13.84”
ESDDR-66 thru 102
34.18”
86.8
20.46”
52.0
13.84”
Dim. “D”
Model
Dim. “E”
Dim. “F”
inches
cm
inches
cm
inches
cm
ESDDR-3 thru 19.5
14.00
35.6
16.00
40.6
6.00
15.2
35.2
ESDDR-22 thru 63
20.00
50.8
20.00
50.8
7.00
17.8
35.2
ESDDR-66 thru 102
20.00
50.8
24.00
61.0
7.00
17.8
ESDDR-*
24.00
61.0
30.00
76.2
7.00
17.8
* Control panel for use with units having 123 amps or higher
Electrical Specifications
Sheet No.
“ESDDR” Series
ESDDR-4
Single Phase Amperage†
ESDDR-3
ESDDR-4.5
ESDDR-5.5
ESDDR-7.5
ESDDR-11
ESDDR-14
ESDDR-15
ESDDR-16.5
ESDDR-19.5
Unit
KW
3
4.5
6.0
7.5
10.5
13.5
15
16.5
19.5
ESDDR-22
ESDDR-28
ESDDR-30
ESDDR-33
ESDDR-39
ESDDR-42
ESDDR-45
ESDDR-49.5
ESDDR-58.5
ESDDR-63
21
27
30
33
39
42
45
49.5
58.5
63
43.8
56.3
62.5
68.8
81.3
87.5
93.8
103.1
121.9
131.3
35.0
45.0
50.0
55.0
65.0
70.0
75.0
82.5
97.5
105.0
ESDDR-66
ESDDR-78
ESDDR-84
ESDDR-102
66
78
84
102
137.5
162.5
175.0
110.0
130.0
140.0
170.0
Model
120V
25.0
37.5
208V
14.4
21.6
28.8
36.1
240V
12.5
18.8
25.0
31.3
480V
6.3
9.4
12.5
15.6
21.9
28.1
31.3
34.4
40.6
600V
5.0
7.5
10.0
12.5
17.5
22.5
25.0
27.5
32.5
No. of
Heaters
3
3
3
3
3
3
3
3
3
1.0
1.5
2.0
2.5
3.5
4.5
5.0
5.5
6.5
Control Circuit
Voltage
24 vac
24 vac
24 vac
24 vac
24 vac
24 vac
24 vac
24 vac
24 vac
6
6
6
6
6
6
9
9
9
9
3.5
4.5
5.0
5.5
6.5
7.0
5.0
5.5
6.5
7.0
24 vac
24 vac
24 vac
24 vac
24 vac
24 vac
24 vac
24 vac
24 vac
24 vac
12
12
12
12
5.5
6.5
7.0
8.5
24 vac
24 vac
24 vac
24 vac
Heater KW
Three Phase Amperage†
ESDDR-3
ESDDR-4.5
ESDDR-5.5
ESDDR-7.5
ESDDR-11
ESDDR-14
ESDDR-15
ESDDR-16.5
ESDDR-19.5
Unit
KW
3
4.5
6.0
7.5
10.5
13.5
15
16.5
19.5
ESDDR-22
ESDDR-28
ESDDR-30
ESDDR-33
ESDDR-39
ESDDR-42
ESDDR-45
ESDDR-49.5
ESDDR-58.5
ESDDR-63
21
27
30
33
39
42
45
49.5
58.5
63
ESDDR-66
ESDDR-78
ESDDR-84
ESDDR-102
66
78
84
102
Model
208V
8.3
12.5
16.6
20.8
29.1
37.5
41.6
45.8
240V
7.2
10.8
14.4
18.0
25.3
32.4
36.1
39.7
480V
3.6
5.4
7.2
9.0
12.6
16.2
18.0
19.8
23.5
600V
2.9
4.3
5.8
7.2
10.1
13.0
14.4
15.9
18.8
No. of
Heaters
3
3
3
3
3
3
3
3
3
1.0
1.5
2.0
2.5
3.5
4.5
5.0
5.5
6.5
Control Circuit
Voltage
24 vac
24 vac
24 vac
24 vac
24 vac
24 vac
24 vac
24 vac
24 vac
58.3
75.0
83.3
91.6
50.5
64.9
72.2
79.4
124.9
137.4
108.3
119.1
25.3
32.5
36.1
39.7
46.9
50.5
54.1
59.5
70.4
75.8
20.2
26.0
28.9
31.8
37.5
40.4
43.3
47.6
56.3
60.6
6
6
6
6
6
6
9
9
9
9
3.5
4.5
5.0
5.5
6.5
7.0
5.0
5.5
6.5
7.0
24 vac
24 vac
24 vac
24 vac
24 vac
24 vac
24 vac
24 vac
24 vac
24 vac
183.2
158.8
79.4
93.8
101.0
122.7
63.5
75.1
80.8
98.2
12
12
12
12
5.5
6.5
7.0
8.5
24 vac
24 vac
24 vac
24 vac
Heater KW
† Other voltages available upon request. Please consult factory for specific availability.
Features
Sheet No.
“ESDDR” Series
ESDDR-5
6
1
2
3
5
4
Features
1. Low Water Float Switch Junction Box
4. 3/4” NPT Ball Valve
2. 1/4” NPT Fill Inlet Connection
5. Heater Assembly Access
3. Overflow Piping
6. Humidifier Steam Outlet Connection
Clearances and Mounting Considerations
Sheet No.
“ESDDR” Series
ESDDR-6
6”
(15.2 cm)
12”
(30.5 cm)
6”
(15.2 cm)
ESDDR-3 thru ESDDR-19.5: 20” (50.8 cm)
ESDDR-22 thru ESDDR-63: 20” (50.8 cm)
ESDDR-66 thru ESDDR-102: 24” (61.0 cm)
36” (91.4 cm) with factory
mounted control panel
6” (15.2 cm) without factory
mounted control panel
24”
(61 cm)
Mounting Location Considerations
Install in a location where the ambient air temperature is between 40°F - 100°F (4.4°C - 37.8°C) and relative
humidity between 0% - 90% and non-condensing.
Install in a location where there is easy access to a water supply, electrical supply, and open sanitary drain.
Install as close as possible to the steam distribution grid.
Clearances shown are minimum recommendations only.
installation location.
Please consult local and national codes for final
Do not install where humidifier operational noise will be a nuisance.
Allow enough room for proper water seals depths.
Do not install above any critical processes, equipment, or locations incase of a water leak.
Do not install near variable frequency drives, electromagnetic equipment or motors.
SCR RELAY CLEARANCE NOTE
If SCR modulating control is supplied on a non-factory mounted control panel you will need to leave 12”
clearance on the sides of the panels where the SCR heat sinks are located.
Mounting Applications
Sheet No.
“ESDDR” Series
ESDDR-7
The “ESDDR” Series Electric Humidifier offers a wide variety of mounting applications. If the duct is remote from the
humidifier reservoir, free-standing floor support legs or wall brackets (both optional) are available. The humidifier can
even be mounted directly within an air handling unit (local codes may require moisture proof construction of certain
components). Single or multiple injection tubes can be used to custom fit any duct or air handler size.
Free Standing Support Legs (optional)
Allows remote mounting of the humidifier reservoir
from the duct. The humidifier is supported 24” from
the floor.
Wall Mounting Brackets (optional)
Allows remote mounting of the humidifier reservoir
from the duct, or it can be used to mount the
humidifier beneath a wall mounted duct.
Specification Sample
Sheet No.
“ESDDR” Series
ESDDR-8
Humidifier
1. The humidifier shall be electrically heated
immersion heater type as manufactured by PURE
Humidifier Co. of Chaska, Minnesota.
2. The humidifier shall be tested and approved by ETL
Testing Laboratories, Inc. to UL 998 standard.
9. A stainless steel, float-operated water fill valve
mounted on the top near the front shall be
provided. The fill valve shall provide automatic
refilling of the humidifier reservoir. The water inlet
shall be located to allow a minimum air gap of 11/2” (3.81 cm).
3. The humidifier shall be suitable for use with
deionized, demineralized, or reverse osmosis water
with a maximum purity of 18 mega ohms per square
centimeter.
10. The humidifier shall have a 3/4” (1.9 cm) over flow
pipe to prevent overfilling of the humidifier
reservoir.
4. The humidifier shall have an evaporating reservoir
with a gasket-sealed cover that is capable of
operating at pressures of at least 19” (48 cm - W.C.)
without steam or water leaks. The reservoir shall be
made of type 304 stainless steel with welded joints.
5. The humidifier shall be designed to facilitate easy
removal of the cover and side-entry immersion
heater assembly for cleaning.
A side-entry
immersion heater assembly shall be incorporated
into the side of the humidifier to permit easy access
to immersion heater elements.
6. Humidifier shall be field-convertible from an electric
immersion heater style “ESDDR” humidifier to a
steam heat exchanger style “SXDDR” humidifier
with a simple change of the side-entry assembly.
7. A stainless steel, float-operated low water cut-off
switch shall be provided. The float switch shall
provide low water cut-off of the humidifier immersion
heaters.
8. The immersion heater(s) shall be incoloy clad and
designed for 80 watts per square inch. They shall
be attached to the reservoir cover and be easily
removed for cleaning or inspection.
11. The humidifier shall have a manual reset overtemperature switch factory-installed on the
humidifier reservoir. The temperature switch shall
provide humidifier over-temperature protection.
12. An INTAC® programmable microprocessor control
module shall be factory-mounted on the cover of
the control panel, and shall electronically control
the low water cut-off and safety switch interlock
functions.
13. The humidifier shall be provided with an ETL listed
JIC NEMA 12 control cabinet, shipped loose
(reference factory mounting option). The control
cabinet shall be made of 14 gauge steel with ANSI
61 gray polyester powder coating, continuous
hinge and oil-resistant gasket. The panel shall
include a factory-wired sub-panel with magnetic
contactor(s), time delay relay, fused control circuit
transformer, numbered terminal block, and heater
fuse(s).
14. The control cabinet shall have a factory-wired time
delay relay circuit. The delay circuit shall prevent
cycling of the low water interlock circuit due to
water fluctuations within the humidifier reservoir.
Reference the “Options” page for a description of the options which can be added to the base specification.
INTAC® Specification Sample
Sheet No.
“ESDDR” Series
ESDDR-9
An INTAC® programmable electronic microprocessor
humidifier control system shall be mounted and pre-wired to
the humidifier control panel door. All humidifier electrical,
ground and control terminal connections shall be enclosed in
an ETL listed NEMA 12 enclosure. The INTAC® controller
shall provide the following standard features:
















Self-diagnostics and system verification on start-up.
Evaporating reservoir water level verification, control and
safety interlock.
Cold water tempering prevents excessively hot water
from draining during an automatic or seasonal drain
cycle.
Safety circuit input terminals including over-temperature
shut down.
Terminal connections to accept virtually all control input
signals. Input control range is selected as an “ONSCREEN” prompt.
User adjustable controlling and high-limit RH PID
functions with adjustable parameters (if utilized).
Door-mounted display and user interface. Provides two
lines of system messaging on a vacuum fluorescent
display screen, LED operational indication and keypad
parameter entry system.
Vacuum fluorescent display brightness is adjustable.
Adjustable input signal filter to attenuate noisy control
input signal.
Numbered screen prompts for set-up and service
identification.
Keypad lock-out with user selected access levels.
Time-delayed scrolling display loop will begin cycling ten
minutes after no buttons have been pressed and will
display the next item for 30 seconds before continuing
down the list – displays system parameters including:
Low and High RH Alarms, System Faults, System Status,
Set Point and Actual Space RH, Set Point and Actual
Duct RH (optional), Outdoor Air Temperature (optional),
Percent Power Output, Humidifier Output (in lbs/hr or kg/
hr), Accumulated Run Time, Time to Clean timer, Water
Level, Water Temperature Set Point and Actual (optional)
and Control Type.
INTAC® controller will automatically shut down when the
ambient temperature is outside of designed operating
temperature range.
Full Networking and BAS communication capability.
Communication connections shall provide two-way
communication via EIA-485 connected Modbus between
the INTAC® controller and the Building Automation
System (BAS) (if utilized).


High/Low humidity deviation alarm contacts
(modulating control only).
Multiple humidifiers can run off of one control signal
from a BAS system. Humidifiers can be set up to run
in parallel or in series.
Safety Circuit/System Fault/Low Water alarm
contacts.
Flash Memory – allows system upgrades through EIA
-485 terminal connections with a laptop computer and
access to e-mail.
OPTIONAL CONTROL FEATURES TO BASE SPECIFICATION
A. Time Cycle Modulation.
Provides 0-100% time
proportioned control of the heater output.
A
compatible humidity sensor shall be shipped loose for
field installation (±3-4% RH).
B. SCR Modulation. Provides 0-100% power modulation
of the heater outputs down to a one-second cycle
rate. All heater sets have full SCR control. A
compatible humidity sensor shall be shipped loose for
field installation (±1-2% RH).
C. SCRmod Control. This is a trim, plus-stage setup
using SCRs on one heater set and contactors on the
rest. Provides 0-100% power modulation of the
heater outputs down to a one-second cycle rate. A
3% hysteresis is built-in so the contactors are not
turning on and off quickly. A compatible humidity
sensor shall be shipped loose for field installation (±23% RH).
D. Variable air volume (VAV) anticipation control. The
INTAC® software shall accept a modulating high-limit
humidity input and space controlling RH input, then
modulates the heater output to prevent over
saturation of the supply air due to changes in the
quantity of air flow. A compatible humidity sensor
shall be shipped loose for field installation.
E. Cold weather relative humidity reset. The INTAC®
software shall accept a modulating temperature input
and automatically reduce the space RH set-point on a
drop in the outside temperature. The reduction of the
RH set-point during cold weather periods prevents
damage due to interior window condensation.
F. Reservoir thermocouple water temperature control.
The INTAC® software provides standby water
temperature sensing and freeze protection.
Reference the "Specification Sample" for the humidifier base specification.
Options
Sheet No.
“ESDDR” Series
ESDDR-10
Humidifier
Insulation. Unit shall be covered (except top cover) with
3/4” (1.9 cm) thick fiberglass duct insulation. Insulation
material shall have aluminum foil facing.
Freeze Protection. A factory-installed temperature sensor
shall be mounted onto the humidifier reservoir. The
system shall maintain the water temperature above
freezing.
Stand-by Water Temperature Sensing. Consists of a
temperature sensor to maintain water temperature at a
selected level for fast response upon a call for humidity.
DDR Seasonal End of Use Drain. Provides automatic
seasonal drain of reservoir. Will drain water from the
humidifier tank after a period of time with no humidity
demand.
Mounting
High Efficiency Insulated Tubes. Thermoplastic wrap
reduces condensate loss and unwanted heat gain during
cooling mode.
To Control Cabinet
Control Cabinet Factory Mounting. Humidifier control
cabinet shall be factory-mounted and wired to the left side
of the humidifier.
NEMA 4 Control Cabinet. A NEMA 4 weather-tight
control cabinet shall be substituted for the standard NEMA
12 cabinet.
Control Panel Door Lock. Control cabinet shall be
provided with a factory-installed key lock on the cabinet
door.
Controls and Safety Devices
Support Legs. Provide support legs made of 1-1/4” x 11/4” x 1-1/4” (3.2 cm) angle iron and painted with enamel
gray paint. Distance from humidifier bottom to floor shall
be 24” (61 cm).
Wall Brackets. Provide two wall brackets made of 1-1/4” x
1-1/4” x 1-1/4” (3.2 cm) angle iron and painted with enamel
gray paint.
Injection Tubes
Injection Tube(s) and Flexible Hose. Each unit shall
include one or more 10-foot (305 cm) sections of 11/2” (3.8 cm) I.D. flexible hose and a 1-1/2” (3.8 cm) O.D.
stainless steel injection tube long enough to extend across
the duct. The reservoir cover shall have a matching
connection so the flexible hose can be connected with two
stainless steel hose clamps. A two-piece duct plate shall
be provided to seal the duct opening.
Blower Pack.
Blower pack consists of a two-speed
contained in an 18-gauge steel cabinet with a factory
mounted and wired temperature interlock. One Blower
Pack can be used per each 33 KW.
Fast-Pac Multiple Tube Assembly. Tube assembly
consists of a stainless steel supply/condensate header with
a 3/4”-NPT drain connection and horizontal 1-1/2”Ø
stainless steel injection tubes.
Insty-Pac Tube Assembly. Tube assembly consists of a
steam supply/separator header constructed of stainless
steel with steam inlet, condensate drain outlet, and steam
jacketed injection tubes welded to header. Steam jacketed
injection tubes constructed of stainless steel with punched
steam ports of the proper size and spacing to deliver the
maximum specified capacity.
Communications Gateway.
Allows Modbus
communicate with BACnet or LonWorks networks.
to
Web Interface. For remote control and monitoring of
humidification system, data logging, and e-mail alerts.
Air Flow Proving Switch. A diaphragm operated air flow
proving switch with adjustable control range of .05” W.C.
to 12.0” W.C. shall be provided for field installation.
Switch rating shall be 2.5 amps at 120V.
Duct High-Limit. A high-limit humidistat shall be provided
for duct installation. The high-limit shall be field set to
prevent over saturation within the supply duct.
Miscellaneous Accessories
DCT-927 Drain Tempering Kit.
mixing of the 212°F drain water.
Provides cold water
Condensate Pump. Used to lift condensate from the
humidifier or tube assembly.
Outdoor Enclosure. Galvanized steel enclosure with
tank freeze protection, control panel mounted, support
legs, insulated tank, enclosure heater and hinged access
doors. Enclosure is ready to be curb-mounted with the
humidifier pre-installed. Ships as one piece. Roof curb is
not included.
Reference the “Specification Sample” for the humidifier base specification.
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