Pure Humidifier INSTY-PAC Series Guide

1
Fig. 1
08/08
INSTY-PAC EXTERNAL MOUNT
SPLIT & CUFFED MULTIPLE
TUBE ASSEMBLY
INSTALLATION
AND
ASSEMBLY INSTRUCTIONS
INSTALLATION
1. Steam supply piping should be pitched two inches (2”) per foot, back to the humidifier.
2. Install the assembly so that the injection tubes are level within the duct or AHU.
3. Install tube with orifices injecting steam up.
4. All drain piping is by others.
5. Each condensate connection must have it’s own water seal. Condensate connections cannot be combined
together to a common water seal.
6. A common condensate drain line can be used after the individual water seals.
Sheet No.
EMIPSC
“Read and Save These Instructions”
Secure end bracket
to AHU/duct
casing with 3/8-16
UNC bolts
AHU/duct height
"H"
water
seal
Open sanitary
drain
Typical PURE
Humidifier Co.
humidifier "H"
water
seal
Open sanitary
drain
"H"
water
seal
Open sanitary
drain
Flexible steam
supply line
(or hard piped
by others in field)
Stainless steel
tube header
Tube support
The water seal height may have to be increased
"SX"/ "GX" Water Seal Height
19" (48 cm)
17" (43 cm)
8" (20 cm)
11" (28 cm)
if excessive duct static pressure exists.
"ES"/ "EC" Water Seal Height
58.5 thru 102
39 thru 49.5
3 thru 19.5
22 thru 33
Total KW
151 and above
100 to 150 (68.0)
61 to 99 (44.9)
Up to 60 (27.2)
Total lbs./hr (kg/hr)
"H"
19" (48 cm)
8"(20 cm)
17" (43 cm)
11" (28 cm)
"H"
"H"
water
seal
Open sanitary
drain
Typ. centers
AHU/duct width
3/4"SW drain piping
(by others)
Injection tube
AHU/duct

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.
humidifiers are simple 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.
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.
The PURE Humidifier Co. Warranty
PURE Humidifier Co. guarantees its products to be free from defects in material and workmanship for a period of
two years 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.
Table of Contents
Introduction 1
Steam Supply Piping Examples 2
Mounting Instructions 3
Component Identification 4
Header & Support Bracket Mounting Detail 5
Installation Tips/Controls 6
Troubleshooting 7
Maintenance 8
Non-Wetting Distance Charts 9
Piping Capacities/Air Pressure Loss 10
Introduction

2
Steam Supply Piping Examples
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.
Pitched Towards Tube Assembly
Pitched Towards Drain Tee
Drain Tee
(see Note 7)
1/4”/1’ 2”/1’
1/4”/1’
Use two 45° elbows for
hard piping or wide 90° for
flexible steam hose
Pitched Towards Steam Generator
Pitched Towards Steam Generator
and Tube Assembly
Pitch
(see Note 1)
2”/1’
see Note 2 Typical
humidifier
reservoir
1/4”/12”/1’
Supply piping
connectors
(see Note 3)

3
Split & Cuffed Insty-Pac Injection Tube Assembly
External Mounting Instructions
The Insty-Pac tube assembly supplied with humidifier(s), is designed for rapid dissipation of
steam. The tube assembly is designed for external AHU or duct mounting.
Verify Components
Unpack the components from the shipping container. Verify all components are checked off
according to the packing list and the COMPONENTS IDENTIFICATION DRAWING (Fig. 2).
Report any missing pieces to your local PURE Humidifier Co. representative immediately.
Location
1. Mount the injection tube assembly in the AHU or duct work as shown on the
project plans or as indicated by the engineer.
2. Install the injection tube with the 3/4”-NPT drain connection, located on the tube
header, directed towards the bottom of the AHU or duct.
3. Install the tube assembly so that the injection tubes are level within the AHU or duct.
4. Install the tube assembly with the steam discharge ports facing upwards.
5. The tube assembly should be centered in the AHU or duct height with an even
distance between the bottom tube and the casing floor and the top tube and the casing
ceiling.
Mounting
1. Cut a slot in the AHU or duct wall that is the same height as the HEADER and 1 1/2”
wide (see Fig. 3).
2. Slide the UPPER injection tube bank assembly through the access slot (cut in steps
above). Secure the END BRACKET to the AHU or duct wall with 3/8-16 UNC
fasteners (by others). The END BRACKET must be located so that the tubes are level
(see Fig. 3). Repeat the same steps with each remaining tube bank assembly.
3. Slip one side of each FLEXIBLE CONNECTORS onto the 1" diameter stub-outs on t h e
TUBE BANKS and secure the FLEXIBLE CONNECTORS with one screw clamp per
stub-out (see Fig. 2 & 3).
4. Slide the HEADER stub-outs into the open end of the FLEXIBLE CONNECTOR on the
TUBE BANKS. Secure each tube to the FLEXIBLE CONNECTOR by tightening the
matching screw clamp (see Fig. 2 & 3).
5. Seal the openings where the injection tubes penetrate through the AHU or duct wall w i t h
the duct plates provided (see Fig. 3).
6. Connect steam supply and condensate piping to humidifier as illustrated on Fig. 1.
NOTE: For tube assemblies over 48” (122 cm) in length, allow for 1/2” (1.3 cm) of linear
expansion of tubes. Not allowing for this expansion could cause system performance
issues or cracking of welds.

4
External Mount Insty-Pac Tube Assembly
Component Identification
ITEM
NO. DESCRIPTION QUANTITY
1 Supply/condensate header 1
2 Injection tubes varies with order
3 Tube mounting bolts 1 per tube
4 Duct plate (injection tube) 1 per tube
5 Tube support bracket 1 per tube bank
6 Flexible connector 1 per tube
Steam inlet connection
Tube drain connection (3/4”-NPT)
Header drain connection (3/4”-NPT)
Alternate drain connection
(if ordered)
1
4 2
5
3
Fig. 2
6

5
Header & Support Bracket Mounting Detail
Notes:
1. Center the multiple injection tube assembly in the duct height.
2. The injection tubes should be mounted level within the duct or AHU.
3. Install injection tubes with the orifices injecting upwards.
4. All condensate drain piping is by others.
5. Condensate must drain by gravity to an open drain. Condensate cannot be elevated.
6. Each condensate connection must have it’s own water seal. Condensate connections cannot
be combined together to a common water seal.
7. A common condensate drain line can be used after the individual water seals.
Fig. 3
End bracket
End bracket
mounting bolts
Mount tubes level within the duct or AHU
3/4” NPT condensate drain
connection (hidden line is the
alternate location—special order)
Steam supply inlet
Cut openings for
injection tubes.
Seal with duct plates.
Supply/
condensate
header
Injection tube
AHU casing or duct wall

6
Installation Tips
Condensate Return Line
Condensate from the header or tubes cannot be elevated. Do not connect water seals to
pressurized condensate return lines. If gravity drain is not possible please use a condensate
pump rated for 212°F water or PURE Humidifier Company Part No. 16033 Hartell A3X-115
condensate pump.
Laminar air flow
Tube assembly must be installed in a location that allows for laminar air flow across entire
grid. A minimum velocity of 300 feet per minute is required to avoid saturation and excessive
fog travel.
Plug fan installations
Install tube assembly as close as possible to the upstream coil to ensure laminar airflow and
proper absorption.
Insulated ducts
Internally insulated ducts must be lined with a non-absorbent material to avoid saturation. If
the duct is lined it must be removed three feet (3’) upstream and ten feet (10’) downstream of
tube assembly.
Final Filters
Tube assembly must be installed a minimum of ten feet (10’) upstream of final filters.
VAV Systems
Low velocity will cause long fog trails and steam will rise wetting the top of the AHU/duct
casing. Modulating VAV high-limit humidistat is required. A minimum velocity of 300 feet per
minute is required to avoid saturation and excessive fog travel.
Controls
Fan Interlock Switch
PURE Humidifier Co. recommends the use of an air flow proving switch or fan interlock to
prove air flow prior to humidifier cooperation. Humidifier operation without air flow will result
in over-saturation of the air stream. Air flow proving switches are available as optional
equipment from your PURE Humidifier Co. representative.
High-Limit Humidistat
PURE Humidifier Co. recommends the use of a duct high-limit humidistat to prevent
humidifier operation when the duct humidity level exceeds 85% relative humidity. Humidifier
operation above 85% relative humidity can result in over-saturation of the air stream. High-
limit humidistats are available as optional equipment from your PURE Humidifier Co.
representative. The high limit humidistat should be 12 to 14 feet (365-427 cm) downstream
from the humidifier injection tube.
Smoke Alarms and Temperature Sensors
Smoke alarms should be located 12 to 14 feet (365-427 cm) upstream from the humidifier
injection tube.
Temperature sensors should be located 12 to 14 feet (365-427 cm) downstream from the
humidifier injection tube, or past any visible fog travel that may be greater than this distance.

7
Troubleshooting
Too Much Humidity
1. Humidity controller out of calibration.
2. Humidifier oversized.
3. Check humidifier (GX, SX, ES, EC) for proper operation.
Too Little Humidity
1. Humidity controller out of calibration.
2. Undersized humidifier.
3. Check humidifier (GX, SX, ES, EC) for proper operation.
4. Water seals are not primed.
5. Water seals are blown due to improper supply piping.
Humidifier Discharges Water
1. Faulty drainage:
A) Return line pressure greater than humidifier pressure.
B) Return line flooded.
C) Vertical lift.
D) Tube assembly not level.

8
Maintenance
1. Header– No maintenance required.
2. Injection Tube – No maintenance required.
3. Water Seal – Should be inspected periodically to make sure the traps are clear.

9
90% 30” 15” 13” 11” 8” 7” 5.5” 2” 1”
85% 15” 11” 10” 9” 7” 5” 4” 1”
80% 10” 8” 7” 6” 5” 3” 2”
70% 8” 6” 5” 4” 3” 1"
60% 6” 4” 3.5” 2.5” 0.75
50% 4” 3” 2” 0.75”
40% 2” 1.5” 0.5”
30% 1” 0.5”
20% 0.25”
10% 20% 30% 40% 50% 60% 70% 80% 85%
90% 60” 30” 27” 24” 20” 16” 14” 13” 9”
85% 50” 24” 21” 17” 13” 12” 10” 8”
80% 40” 19” 15” 13” 9” 8” 7”
70% 30” 15” 11” 9” 6” 4”
60% 15” 11” 8” 5” 3”
50% 9” 8” 4” 2”
40% 5” 4” 1”
30% 2.5” 1”
20% 0.5”
10% 20% 30% 40% 50% 60% 70% 80% 85%
Relative Humidity
Leaving Relative Humidity
Leaving
Relative Humidity Entering
Relative Humidity Entering
Non-Wetting Distance With a Insty-Pac Tube Assembly Having 3” Centers
Non-Wetting Distance With a Insty-Pac Tube Assembly Having 6” Centers
The above is based on air conditions of 55°F duct temperature at a velocity of 500 feet per minute.
Dissipation distance may vary depending on airflow and temperature characteristics.

10
Maximum Steam Supply Piping Capacities
(Atmospheric Applications Only)
Type lbs/hr (kg/hr)* Type lbs/hr (kg/hr)* Type lbs/hr (kg/hr)*
1 1/2” 150 (68)
Flexible
Hose
1 1/2” 130 (59)
Copper/
SST Tubing
1 1/2” 150 (68)
Schd’l 40
Pipe
2” 250 (113)
Flexible
Hose
2” 200 (68)
Copper/
SST Tubing
2” 215 (98)
Schd’l 40
Pipe
3” 500 (227)
Flexible
Hose
3” 411 (186)
Copper/
SST Tubing N/A
N/A 4” 730 (331) Copper/
SST Tubing N/A
N/A N/A 1 1/4” 130 (59) Schd’l 40
Pipe
* For lengths up to 10’
Insulating hard piping is not required but will reduce condensate loss by 90%.
Air Pressure Loss in Inches of Water Column
Note: Tube spacing greater than 6” has no measureable air pressure loss.
Air Velocity 3”
Tube Spacing 6” Tube Spacing
500 fpm .025 .015
1000 fpm .085 .030
1500 fpm .180 .055
750 fpm .060 .020
1250 fpm .130 .043

11
141 Jonathan Blvd. North
Chaska, MN 55318
Tel: [phone] Fax: [phone]
www.purehumidifier.com