Pure ESDDR Owners Manual
“Read and Save These Instructions”
Deionized, Demineralized, or Reverse Osmosis Water
“ESDDR” Series
Electric Humidifier
Installation Instructions
Operation and Maintenance Manual
ETL LISTED HUMIDIFIER
Our results are comforting
Form No: ESDOM-06-10
1
Introduction
To the user of PURE Humidifier Co.’s
Electric Humidifiers
Table of Contents
Introduction
Internal Humidifier Features
Capacity & Weights
Layout and Dimensions
Electrical Specifications
Mounting/Location
Hose Kit Installation
Steam Piping Examples
Water Supply Piping
Start-Up Procedure
Maintenance Instructions
Trouble Shooting
Tool Requirements
Maintenance Notes
Exploded Parts Drawing
Parts List
We at PURE Humidifier Co. thank you for choosing
one of our quality products. PURE Humidifier Co.’s
“ESDDR” 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.
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. Consult the factory if you are unsure
about which chemical descaler to use.
The “ESDDR” Series Humidifier is designed to
operate with deionized, demineralized, or reverse
osmosis water. All components that will be in
contact with the water are constructed of type 304
stainless steel, incoloy or corrosion resistant
materials.
External Features of the PURE
Humidifier Co. “ESDDR” Series
Electric Humidifier
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.
Low Water
Float Switch
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.
Overflow
Connection
Drain Valve
Side Entry Immersion
Heater Assembly
1
1
1
2
3
4
5-6
7
8
9
10
11
12
13
14
15
16
Capacities & Weights
Standard
Water Unit
Model No.
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
16.5
7.5
5.5
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
11
50.5
22.9
130.5
59.2
32.0
14.5
ESDDR-14
40.5
18.4
14
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
22
61.0
27.7
177.0
80.3
55.0
25.0
ESDDR-28
81.0
36.7
28
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.
2
Dimensions & Layout
NEMA– 12 Humidifier Control Cabinet
(reference control cabinet notes)
Steam Outlet Connection
(size and qty. will vary with application)
“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.
Junction Box
(not supplied with optional
control cabinet factory mounted)
Heater Assembly Removal
(allow a minimum side clearance
equal to dimension “B”)
Top View
1/4” - IPS Fill Inlet
Connection
Low Water Float Switch
Junction Box
Over-Temperature
Cut-out Switch
3.625”
(9.21)
“C”
Side Entry Immersion Heater
Assembly
3/4”- NPT Water
Overflow Connection
.75”
(1.9)
Drain Valve
Front View
Right Side View
Unit Dimensions in inches (cm)
Model Number
ESDDR-3 thru 19.5
ESDDR-22 thru 63
ESDDR-66 thru 102
Dim. “A”
17.50” (44.5)
25.50” (64.8)
34.00” (86.4)
“A”
Dim. “B”
Control Cabinet Dimensions in inches (cm)
Dim. “C”
14.00” (35.6) 13.75” (34.9)
14.00” (35.6) 13.75” (34.9)
18.25” (46.4) 13.75” (34.9)
Model Number
Dim. “D”
Dim. “E”
Dim. “F”
ESDDR-3 thru19.5
ESDDR-22 thru 63
ESDDR-66 thru 102
14.00” (35.6)
20.00” (50.8)
20.00” (50.8)
16.00” (40.6)
20.00” (50.8)
24.00” (61.0)
6.00” (15.2)
7.00” (17.8)
7.00” (17.8)
3
Electrical Specifications
Single Phase Amperage†
Standard Water
Unit Model No.
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
120V
25.0
37.5
208V
14.4
21.6
26.4
36.1
240V
12.5
18.8
22.9
31.3
480V
6.3
9.4
11.5
15.6
21.9
28.1
31.3
34.4
40.6
600V
5.0
7.5
9.2
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
Heater KW
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
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
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
12
12
12
12
5.5
6.5
7.0
8.5
24 vac
24 vac
24 vac
24 vac
Three Phase Amperage†
Standard Water
Unit Model No.
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
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.
4
Location & Mounting
Location
Mounting
The location selected must provide for electrical
service, cold or hot water supply, and sanitary drain.
The humidifier should be mounted dead level in
both directions. PURE Humidifier Co. recommends
that the humidifier be mounted using one of the
following three methods (ref. page 6):
When selecting a location, try to keep the humidifier
within 10 feet (305 cm) of the duct to avoid
unnecessary heat losses and condensation within
the steam supply line.
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 turbulent
air flow area.
Avoid mounting the injection tube closer than 8-10
feet (244-305 cm) upstream of objects that could
become saturated and condense the steam
(reference the 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.
Location of Controls
It is important to avoid mounting any controls within
the visible steam. The controls 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.
1. Mounted on the wall. PURE Humidifier Co.
offers wall mounting brackets as an option. The
wall bracket installation sheet should be
followed when installing the brackets.
2. Mounted off the floor with floor legs. PURE
Humidifier Co. offers floor support legs as an
option. The humidifier is mounted 24” (61 cm)
up from the floor. Simple floor legs can be
constructed from 1-1/4” x 1-1/4” x 1/4” angle
iron. The support legs should be secured to the
humidifier side mounting holes.
Drain Pan Mounting
A drain pan is an additional safety feature which
would 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.
5
Mounting Applications
Free Standing Support Legs
(optional)
Allows remote mounting of the
humidifier reservoir from the
duct. The humidifier is supported
24” from the floor.
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.
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.
6
Hose Kit Installation
Flexible Hose Kit Installation
Hose kits should have the injection tube
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.
Flexible Hose
Stainless Steel
Drain Tee
(optional)
Duct (beneath
humidifier)
Typical “ESDDR” Series
Electric Humidifier
3/4” SW Condensate
drain line (by others)
“H” Water
Seal Height
Water Seal Height ∆
Total KW
3 thru 19.5
22 thru 33
39 thru 49.5
58.5 thru 102
"H"
8" (20 cm)
11" (28 cm)
17" (43 cm)
19" (48 cm)
Open Sanitary
Drain
∆ The water seal height may have to
be increased if excessive duct
static pressure exists.
Tube Detail
Duct Plate
1 1/2ӯ
6”
Flexible Hose
Pitch 2” (5 cm) per foot (31 cm)
back to the humidifier.
4”
Duct
Injection Tube
Pitch 2” (5 cm) per foot (31 cm)
back towards the humidifier.
6” (15 cm) Minimum
Insertion Length/
Duct Width
Injection Tube
(typ.)
Air Flow
Typical “ESDDR” Series
Electric Humidifier
Stagger tubes a
minimum of six inches
(15 cm) apart from
each other (typ.)
7
Maintain a minimum
of six inches (15 cm)
from the bottom and
top of the duct
Steam Supply Piping Examples
Pitch
(see Note 1)
Use two 45° elbows for
hard piping or wide 90° for
flexible steam hose
1/4”/1’
2”/1’
Supply piping
connectors
(see Note 4)
Pitched Towards Tube Assembly
Pitched Towards Steam Generator
Drain Tee
(see Note 8)
2”/1’
1/4”/1’
1/4”/1’
2”/1’
Typical
Humidifier
Reservoir
see Note 2
Pitched Towards Steam Generator
and Tube Assembly
Pitched Towards Drain Tee
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. Install union to allow for cover removal.
4. Use flex connectors or unions to allow for easy removal of cover.
5. Support flexible hose every 18" to avoid sagging.
6. Hard piping or flexible hose must match reservoir outlet size. Do not use supply piping with a smaller inside
diameter than the reservoir outlet.
7. Failure to follow the piping recommendation on this page may result in blown water seals, leaking cover
gasket or dispersion tubes spitting.
8. Install a Drain Tee at any low spots in supply piping run where condensate will accumulate.
9. Reference job specific tube assembly O&M included with your order for complete details.
8
Water Supply Piping
Water Supply Piping
Drain Piping
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.
The “ESDDR” style humidifier requires two drain
piping connections; a drain and an overflow
connection. The drain lines should be piped together
before the water seal as shown in the drain piping
illustration.
Cold or hot deionized, demineralized, or reverse
osmosis water can be supplied to the humidifier. A
minimum water pressure of 15 psi (1.03 Bar) should
be maintained to provide the proper water level within
the humidifier. If the water pressure is above 50 psi
(3.5 Bar), water hammer could occur and a pressure
reducing valve or shock arrester should be used. 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 the
vacuum breaking device is required.
A water seal (as shown in the piping illustration)
should be installed to prevent steam from escaping
through the drain line. The water seal should be of
sufficient height to overcome the pressure developed
in the humidifier (reference water seal height table)
and the duct static pressure.
The drain piping should be copper or stainless steel.
The use of PVC piping is not recommended; the
humidifier temperature may cause the PVC to soften
and fail.
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.
Steam Outlet
Connection
Water Seal Height ∆
Tee Connection from
overflow pipe (by
others). Reference
the top view.
“H”
Water Seal
Total KW
3 thru 19.5
22 thru 33
39 thru 49.5
58.5 thru 102
∆ The water seal height may have
to be increased if excessive duct
static pressure exists.
3/4” - NPT Drain
Connection
NOTES
SIDE VIEW
Open Sanitary
Drain
3/4” - NPT Overflow
Drain Connection
"H"
8" (20 cm)
11" (28 cm)
17" (43 cm)
19" (48 cm)
1/4” - NPT Water Inlet
Connection †
3/4” - NPT
Connection to water
trap (by others).
Reference side view.
9
1. All drain piping is by others.
2. Drain and overflow connections
require field piping. The overflow
connection must be piped to the
drain line before the water seal.
3. Do NOT use PVC or other plastic
piping that is not rated for 220°F or
higher.
4. The humidifier has a 1.5” (4 cm) air
gap between the water inlet and
humidifier water level. Consult the
local code to determine if a vacuum
breaking device is required.
Start-Up Procedure
Introduction
Before starting the “ESDDR” PURE Humidifier
Co. Electric Humidifier, check the following
installation procedures:
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 and steam line.
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. PIPING - Verify that all piping connections have
been completed as recommended and that water
pressure is available to the humidifier.
Start Up Procedure
1. Close the humidifier manual ball valve (located on
the left side of the humidifier evaporating chamber
faceplate).
2. Turn the electric power “on” to the humidifier. The
LCD display on the INTAC® controller should
illuminate “Normal Operation”.
4. Open the water supply on/off control valve (by
others) and allow the humidifier evaporating
chamber to fill to the proper level.
5. After the humidifier is full of water, menu 004 will
read “FULL”.
6. Verify the low water safety circuit by opening the
manual drain lever on the drain valve. As the
humidifier tank is draining, the "Fill" LED should
illuminate. The humidifier should drain to a level
where menu 004 reads “LOW”; this indicates
that the low water safety circuit is operational.
7. Close the drain valve and allow the humidifier to
fill to the proper level.
8. Make sure all the optional safety switches are
satisfied (airflow proving switch, high-limit
humidistat, etc.).
9. Turn menu 101 “RH Setpoint” up to a call for
humidity.
10. The heater(s) should energize on a call from the
humidistat or BMS.
11. 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 power. The
safety switches should shut-off the h u m i d i f i e r
heaters whenever one or more of the
optional safety switches create an “open circuit”.
12. Check heater amperage draw by testing and
recording voltage and amperage in each phase.
Readings should match the factory heater
nameplate.
13. Inspect installation for leaks by operating
humidifier. Any leaks should be sealed.
3. 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.
10
Maintenance Instructions
PURE Humidifier Co. “ESDDR” Maintenance Instructions
The “ESDDR” Series Humidifier is designed to provide the best possible operation with minimum
maintenance. 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 inspected and/or cleaned on a minimum basis of twice a
year. If excessive mineral build-up occurs, the maintenance schedule should be increased.
Inspect / Maintenance Item
Procedure to Follow
Water Make-up Float Valve
Check to make sure the fill valve is operating properly. If
the valve appears to continually fill, check the valve seat
and seal (see trouble shooting instructions).
Low Water Float Switch
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.
Safety Interlocks
(air flow, high-limit)
Check to make sure the safety interlocks (air flow, highlimit, etc.) will shut down the humidifier.
Immersion Heaters
Verify the correct amperage is being drawn by the heating
element. Reference the wiring diagram for correct
amperage.
Humidifier Cover / Tank
Inspect for any leaks. Repair as required. Remove the
mineral deposits from floor of the humidifier reservoir. If
excessive build-up is found, the cover may need to be
removed to facilitate complete cleaning of the humidifier.
Flexible Hose
Inspect for cracks or leaks. It is normal for the hose to
become hard and develop a “set”.
11
Trouble Shooting
Problem
Humidifier will not heat
Humidifier will not fill
Humidifier will not stop
filling or is short cycling
Possible Cause
Recommended Action
Blown heater fuse(s)
Check and replace.
Control transformer not
producing 24 vac control
voltage
Check transformer output.
Verify voltage across terminals #1 (hot) and
#3 (comm).
Safety controls open
(air flow switch, high-limit, etc.)
Verify that all safety controls are completing the
safety circuit.
Faulty immersion heater
Check and verify heater voltage and
amperage. Compare to diagram or
nameplate label ratings.
No water pressure
Check water supply.
Drain valve open
Close drain ball valve.
Faulty water float valve
Check float valve seat for dirt.
Float valve stuck open
Check float valve seat for dirt.
Adjust float ball arm.
Drain valve open
Close drain ball valve.
12
Tool Requirements
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
13
Maintenance Notes
Maintenance Notes
Maintenance Performed
Date
14
By
15
PURE Humidifier Co. "ESDDR" Series
Parts List & Two Year Recommended Spare Parts
Item No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
Description
Part No.
ESDDR Reservoir Assembly
ESDDR Reservoir Cover Assembly
Immersion Heating Element(s)
Cover Gasket
DDR Float Plate Assembly
DDR Float Plate Gasket
Cover Clamp
Cover Clamp Screws
10-24 U Nut
Water Level Control Switch
1/4" Coupling 316 SST
1/4" 90 El. 316 SST
Float Plate Screws
Float Valve and Ball, 316 SST
3/4" Ball Valve, 316 SST
Over Temp. Protector Switch
Over Temp. Switch Housing
Electrical Box
1/2" Junction Box
Heater Plate Gasket
Heater Plate
U-Clamp Bar
U-Clamp Blots
Heater Cover
Heater Cover Knobs
1/4-20 Nut
Control Enclosure
Step-Down Transformer
Time Delay Relay
Power Distribution Block
Fuse Block
Heater Fuses
Heater Contactors
Control Circuit Fuse Holder
Control Circuit Fuse
Secondary Fuse Holder
Secondary Fuse
INTAC® Microprocessor
7 Pin Terminal Connector
6 Pin Terminal Connector
A
A
A
A
05407
05052
15930
15522
15524
15048
07018
07019
15523
A
09036
15047
15072
15076
15079
A
A
05238
15526
A
15865
15702
A
A
12022
A
A
A
A
12085
A
A
A
12201
12310
12309
Qty
Rec.
Per Unit SpareQty.
1
1
A
1
1
1
A
A
A
1
1
1
10
1
1
1
1
1
1
1
1
A
A
1
2
A
1
1
1
A
A
A
A
1
1
A
A
1
A
A
NOTES/CODES:
A= Part Number and quantity vary with model number.
When ordering replacement or spare parts, please have the following information
available: Model Number, Primary Voltage, Serial Number, No. of Heaters & Heater
KW and any options ( ie, modulating control, insulation, etc. )
16
141 Jonathan Blvd. North
Chaska, MN 55318
Tel: (952) 368-9335 Fax: (952) 368-9338
www.purehumidifier.com
15
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