DriSteem R-1 Series User manual

RTS®
Resistive-to-Steam Humidifier
Installation, Operation,
and Maintenance Manual
READ AND SAVE THESE INSTRUCTIONS

ii RTS HUMIDIFIER RX SERIES INSTALLATION, OPERATION, AND MAINTENANCE MANUAL
WARNING CAUTION
Indicates a hazardous situation that could result in death or
serious injury if instructions are not followed.
Indicates a hazardous situation that could result in damage to or
destruction of property if instructions are not followed.
WARNING
Attention installer
Read this manual before installing, and leave this manual with product owner. This product must be installed by qualified
HVAC and electrical contractors and in compliance with local, state, federal, and governing codes. Improper installation
can cause property damage, severe personal injury, or death as a result of electric shock, burns, or fire.
DriSteem Technical Support: 800-328-4447
Read all warnings and instructions
Read this manual before performing service or maintenance procedures on any part of the system. Failure to follow all
warnings and instructions could produce the hazardous situations described, resulting in property damage, personal injury,
or death.
Failure to follow the instructions in this manual can cause moisture to accumulate, which can cause bacteria and mold
growth or dripping water into building spaces. Dripping water can cause property damage; bacteria and mold growth can
cause illness.
Hot surfaces and hot water
This steam humidification system has extremely hot surfaces. Water in tanks, steam pipes, and dispersion assemblies can
be as hot as 212 °F (100 °C). Discharged steam is not visible. Contact with hot surfaces, discharged hot water, or air
into which steam has been discharged can cause severe personal injury. To avoid severe burns, follow the cool down
procedure on page 52 before performing service or maintenance procedures on any part of the system.
Warnings and cautions
WARNINGS AND CAUTIONS

iii
RTS HUMIDIFIER RX SERIES INSTALLATION, OPERATION, AND MAINTENANCE MANUAL
Warnings and cautions
WARNING
Disconnect electrical power
Disconnect electrical power before installing supply wiring or performing service or maintenance procedures on any
part of the humidification system. Failure to disconnect electrical power could result in fire, electrical shock, and other
hazardous conditions. These hazardous conditions could cause property damage, personal injury, or death.
Contact with energized circuits can cause property damage, severe personal injury, or death as a result of electrical shock
or fire. Do not remove humidifier electrical panel cover, heater terminal cover, or subpanel access panels until electrical
power is disconnected.
Follow the shutdown procedure on page 52 before performing service or maintenance procedures on any part of the
system.
Electric shock hazard
• If the humidifier starts up responding to a call for humidity during maintenance, severe bodily injury or death from
electric shock could occur. To prevent such start-up, follow the procedure below before performing service or
maintenance procedures on this humidifier (after the tank has cooled down and drained):
1. Use Vapor-logic®display to change control mode to Standby.
2. Shut off all electrical power to humidifier using field-installed fused disconnect, and lock all power disconnect
switches in OFF position.
3. Close field-installed manual water supply shut-off valve.
• The appliance is not to be used by persons (including children) with reduced physical sensory or mental capabilities,
or lack of experience and knowledge, unless they have been given supervision or instruction.
• Children being supervised not to play with the appliance.
• Thermal cut-out component is critical to the safety of this equipment: use only DriSteem replacement part.
CAUTION
Hot discharge water
Discharge water can be as hot as 212 °F (100 °C) and can damage some drain plumbing.
To prevent such damage from humidifiers with water tempering disabled, allow the tank to cool before draining.
Humidifiers equipped using internal water tempering or an external water tempering device need fresh make-up water in order to
function properly. Make sure the water supply to the humidifier remains open during draining.
Excessive supply water pressure
Supply water pressure greater than 80 psi (550 kPa) can cause the humidifier to overflow.

iv RTS HUMIDIFIER RX SERIES INSTALLATION, OPERATION, AND MAINTENANCE MANUAL
Table of contents
ATTENTION INSTALLER
Read this manual before installing.
Leave manual with product owner.
DriSteem®Technical Support
800-328-4447
WHERE TO FIND MORE INFORMATION
Our web site:
The following documents are available on our
web site: www.dristeem.com
• RTS Catalog and Brochure
• RTS Humidifier Installation, Operation,
and Maintenance manual (IOM)
• Vapor-logic touchscreen controller
(includes humidifier operation and
troubleshooting) IOM
The Vapor-logic Touchscreen Installation
and Operation Manual, which was
shipped with your humidifier, is a
comprehensive operation manual. Refer
to it for information about using the
display and Web interface, and for
troubleshooting information.
DriCalc®sizing and selection software:
DriCalc, our software for humidification
system sizing and selection, can be ordered at
dristeem.com.
Call us at 800-328-4447
Obtaining documents from our web site or
from DriCalc is the quickest way to view our
literature.
WARNINGS AND CAUTIONS ...................................................ii
OVERVIEW.................................................................2
Product overview.........................................2
Principle of operation......................................3
SPECIFICATIONS .............................................................4
Models, capacities, and electrical specifications ...................4
Models, capacities, and electrical specifications (Europe) ............6
Weights: ..............................................8
RX-XX-1 and RX-XX-2 ...................................8
RX-XX-3 and RX-XX-4 ...................................9
Water ...............................................10
Indoor and no enclosure dimensions (RX-XX-1 and RX-XX-2) ..........11
Indoor and no enclosure dimensions (RX-XX-3 and RX-XX-4) ..........13
INSTALLATION ............................................................ 14
Selecting a location .....................................16
Mounting .............................................17
Piping ...............................................19
Overview ..........................................19
Steam.............................................21
Supply water piping ..................................22
Drain .............................................23
Drain water tempering .................................25
Condensate return ....................................30
Wiring ...............................................32
Outdoor enclosure: ......................................34
Overview ..........................................34
Operation..........................................36
Location ...........................................37
Dimensions .........................................38
Mounting ..........................................39
Clearances .........................................42
Freeze protection piping................................46

1
RTS HUMIDIFIER RX SERIES INSTALLATION, OPERATION, AND MAINTENANCE MANUAL
Table of contents
OPERATION .............................................................. 47
Start-up ..............................................47
Start-up commissioning checklist .............................48
MAINTENANCE ........................................................... 51
Overview .............................................51
Preparing for maintenance .................................52
Inspection and maintenance ................................53
Component replacement. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
REPLACEMENT PARTS ....................................................... 59
RTS Humidifier RX Series (-1 & -2) ............................59
RTS Humidifier RX Series (-3 & -4) ............................63
Heaters ..............................................66
Subpanel for -1 and -2 models ..............................68
Subpanel for -3 and -4 models ..............................70
WARRANTY .............................................................. 72

2RTS HUMIDIFIER RX SERIES INSTALLATION, OPERATION, AND MAINTENANCE MANUAL
From providing comfort humidity to meeting the strictest clean-room
requirements, the RTS electric humidifier is designed to meet the humidification
demands of any building environment. The RTS humidifier RX series is an
electric humidifier that uses resistive heating elements to boil water into steam.
While RO/DI water will grant you the best accuracy with the RTS, any water
type can be used. Drain rates are automatically determined per the quality of
your water, and integrated drain water tempering is standard on every unit.
FIGURE 2-1: RTS HUMIDIFIER
OM-8040
Water
level
control
Steam outlet
Fill valve
P-trap
Skimmer
Heaters
Vapor-logic controller
touchscreen display
Product overview
OVERVIEW
Drain
valve

3
RTS HUMIDIFIER RX SERIES INSTALLATION, OPERATION, AND MAINTENANCE MANUAL
OVERVIEW
Principle of operation
1. When the system is first activated, the fast fill valve opens, the precision fill valve opens, and the tank fills with
water to the operating level.
2. On a call for humidity, the heating elements are energized, causing the water to boil. The precision fill valve opens
and closes as needed to maintain the operating water level.
3. Steam created in the evaporating chamber flows through vapor hose or piping to the dispersion assembly, where it
is discharged into the airstream.
4. Over time, the tank will drain. Steam humidifiers drain to remove chlorides and minerals from the tank.
• As the humidifier drains, the water will be tempered down to 140 degrees. Drain water tempering can be turned
off in Settings.
• There are a few options when it comes to draining. The Smart Drain setting (default) will detect the cleanliness
of the water and drain accordingly. In User Drain the user is able to set the water usage in-between drains. Both
Smart Drains and User Drains can be scheduled to happen at a specific time in the day (default is 12:00am).
The user can also specify Full Drain or Mini-drain. A Full Drain will drain the tank completely. A Mini-drain will
partially drain the tank. If full tank drains are not permitted, mini-drain shuts the electronic drain water tempering
off. An external thermostatic tempering device would need to be installed to maintain drain water tempering.
5. After the tank drains and refills, a portion of the surface water is skimmed off, carrying away precipitated minerals.
6. If foam is sensed in the tank, the unit will drain and start over with fresh water – regardless of scheduled drain
times.
OM-8050
FIGURE 3-1: RTS HUMIDIFIER PRINCIPLE OF OPERATION

4RTS HUMIDIFIER RX SERIES INSTALLATION, OPERATION, AND MAINTENANCE MANUAL
Models, capacities, and electrical specifications
SPECIFICATIONS
Table 4-1:
RTS humidifier capacities, electrical specifications
RTS
model
Maximum steam
capacity Power Stages Total max current draw (amps)
Single-phase Three-phase
lbs/hr kg/h kW Contactors 120V 208V 240V 277V 480V 600V 208V 240V 380V 480V 600V
RX-6-1 6 2.7 2 1 16.7 9.6 8.3 21.7 4.2 3.3 — — — — —
RX-12-1 12 5.4 4 1 33.3 19.2 16.7 21.7 8.3 6.7 16.7 14.4 9.10 7.2 5.8
RX-18-1 18 8.2 6 1 — 28.9 25 21.7 12.5 10 16.7 14.4 9.10 7.2 5.8
RX-24-1 24 10.9 8 1 — 38.5 33.3 43.3 16.7 13.3 25 21.7 13.70 10.8 8.7
RX-30-1 30 13.6 10 1 — — 41.7 43.3 20.8 16.7 33.3 29.9 18.20 14.4 11.6
RX-36-1 36 16.3 12 1 — — — 43.3 25 20 33.3 28.9 18.20 14.4 11.6
RX-42-1 42 19.0 14 1 — — — — 29.2 23.3 41.6 36.1 22.80 18 14.4
RX-48-1 48 21.8 16 1 — — — — 33.3 26.7 — 43.3 27.40 21.7 17.3
RX-63-1 63 28.6 21 1 — — — — 43.8 35 — — 34.2 27.1 21.7
RX-75-1 75 34.0 25 1 — — — — — 45 — — 41 32.5 26
RX-30-2 30 13.6 10 2 — 57.7 — — — — — — — — —
RX-36-2 36 16.3 12 2 — 57.7 50 — — — — — — — —
RX-48-2 48 21.8 16 2 — 76.9 66.7 86.6 — — 50 — — — —
RX-63-2 63 28.6 21 2 — — 91.7 86.6 — — 66.6 57.7 — — —
RX-75-2 75 34.0 25 2 — — — — 54.2 — 83.2 72.2 — — —
RX-90-2 90 40.8 30 2 — — — — 62.5 50 — 86.6 54.7 43.3 34.6
RX-102-2 102 46.3 34 2 — — — — 70.8 56.7 — 86.6 54.7 43.3 34.6
RX-126-2 126 57.1 42 2 — — — — 87.5 70 — — 68.4 54.1 43.3
RX-144-2 144 65.3 48 2 — — — — — 80 — — 82 65 52
RX-162-2 162 73.5 54 2 — — — — — 90 — — 82 65 52
• All RTS humidifier models operate at 50/60 Hz.
• For wire sizing, the highest leg draw is shown due to current imbalance.
• See Table 66-1 for heaters.
• Maximum amps is determined based on the heaters used by each model. Some voltage/kW combinations show higher amperage values than
what the unit capacity will allow.

5
RTS HUMIDIFIER RX SERIES INSTALLATION, OPERATION, AND MAINTENANCE MANUAL
Models, capacities, and electrical specifications (continued)
Table 5-1:
RTS humidifier capacities, electrical specifications (continued)
RTS model
Maximum steam
capacity Power Stages Total max current draw (amps)
Single-phase Three-phase
lbs/hr kg/h kW Contactors 120V 208V 240V 277V 480V 600V 208V 240V 380V 480V 600V
RX-63-3 63 28.6 21 3 — 115.4 — — — — — — — — —
RX-75-3 75 34.0 25 3 — 129.8 112.5 130 — — — — — — —
RX-90-3 90 40.8 30 3 — — 125 130 — — 99.9 — — — —
RX-102-3 102 46.3 34 3 — — — 130 — — 99.9 — — — —
RX-126-3 126 57.1 42 3 — — — — — — 124.9 108.3 — — —
RX-144-3 144 65.3 48 3 — — — — 100 — — 129.9 — — —
RX-162-3 162 73.5 54 3 — — — — 112.5 — — 129.9 — — —
RX-189-3 189 85.7 63 3 — — — — 137.5 110 — — 102.6 81.2 65
RX-216-3 216 98.0 72 3 — — — — — 120 — — 123.1 97.4 77.9
RX-243-3 243 110.2 81 3 — — — — — 135 — — 123.1 97.4 77.9
RX-102-4 102 46.3 34 4 — 173.1 150 — — — — — — — —
RX-126-4 126 57.1 42 4 — — 183.3 173.3 — — — — — — —
RX-144-4 144 65.3 48 4 — — — 173.3 — — 133.2 — — — —
RX-162-4 162 73.5 54 4 — — — — — — 166.5 — — — —
RX-216-4 216 98.0 72 4 — — — — 150 — — 173.2 — — —
RX-264-4 264 119.7 88 4 — — — — 183.3 146.7 — — 164.1 129.9 103.9
RX-288-4 288 130.6 96 4 — — — — — 160 — — 164.1 129.9 103.9
RX-324-4 324 146.9 108 4 — — — — — 180 — — 164.1 129.9 103.9
• All RTS humidifier models operate at 50/60 Hz.
• For wire sizing, the highest leg draw is shown due to current imbalance.
• See Table 66-1 for heaters.
• Maximum amps is determined based on the heaters used by each model. Some voltage/kW combinations show higher amperage values than
what the unit capacity will allow.
SPECIFICATIONS

6RTS HUMIDIFIER RX SERIES INSTALLATION, OPERATION, AND MAINTENANCE MANUAL
SPECIFICATIONS
Table 6-1:
RTS humidifier capacities, electrical specifications (Europe)
RTS model
230V Single Phase 400V Three Phase
Maximum Steam Power
Total
Maximum
Current
Draw
Heater
Configuration*
Maximum Steam Capacity Power
Total
Maxi-
mum
Current
Draw
Heater
Configuration
lbs/hr kg/hr kW amps lbs/hr kg/hr kW amps
RX-6-1 5.5 2.5 2 8 1-003 — — — — —
RX-12-1 11 5.0 4 16 1-009 12 5.4 4 8.70 2-005
RX-18-1 16.5 7.5 6 24 1-016 18 8.2 6 8.70 3-005
RX-24-1 22 10.0 8 31.9 2-009 24 10.9 8 13.00 2-005, 1-011
RX-30-1 27.6 12.5 10 39.9 1-009, 1-016 30 13.6 10 17.30 1-005, 2-011
RX-36-1 33.1 15.0 12 47.92 2-016 36 16.3 12 17.30 3-011
RX-42-1 — — — — — 42 19.0 14 21.70 2-011, 1-019
RX-48-1 — — — — — 48 21.8 16 26.00 1-011, 2-019
RX-63-1 — — — — — 63 28.6 21 32.5 2-019, 1-025
RX-75-1 — — — — — 75 34.0 25 39 3-025
RX-30-2 — — — — — — — — — —
RX-36-2 — — — — — — — — — —
RX-48-2 44.1 20.0 16 63.9 4-009 — — — — —
RX-63-2 66.1 30.0 21 95.8 4-016 — — — — —
RX-75-2 — — — — — — — — — —
RX-90-2 — — — — — 90 40.8 30 52 2-011, 4-019
RX-102-2 — — — — — 102 46.3 34 52 6-019
RX-126-2 — — — — — 126 57.1 42 65 4-019, 2-025
RX-144-2 — — — — — 144 65.3 48 77.9 2-019, 4-025
RX-162-2 — — — — — 162 73.5 54 77.9 6-025
• All RTS humidifier models operate at 50/60 Hz.
• For wire sizing, the highest leg draw is shown due to current imbalance.
• *600931 are the first digits of the heater part number.
• Maximum amps is determined based on the heaters used by each model. Some voltage/kW combinations show higher amperage values than
what the unit capacity will allow.
Models, capacities, and electrical specifications (Europe)

7
RTS HUMIDIFIER RX SERIES INSTALLATION, OPERATION, AND MAINTENANCE MANUAL
Models, capacities, and electrical specifications (Europe)
SPECIFICATIONS
Table 7-1:
RTS humidifier capacities, electrical specifications (Europe)
RTS model
230V Single Phase 400V Three Phase
Maximum Steam Power
Total
Maximum
Current
Draw
Heater
Configuration
Maximum Steam Capacity Power
Total
Maxi-
mum
Current
Draw
Heater
Configuration
lbs/hr kg/hr kW amps lbs/hr kg/hr kW amps
RX-63-3 — — — — — — — — — —
RX-75-3 74.4 33.7 25 107.8 3-023 — — — — —
RX-90-3 90.9 41.2 30 131.8 3-003, 3-023 — — — — —
RX-102-3 99.2 45.0 34 143.8 6-016 — — — — —
RX-144-3 — — — — — — — — — —
RX-162-3 — — — — — — — — — —
RX-189-3 — — — — — 189 85.7 63 97.4 6-019, 3-025
RX-216-3 — — — — — 216 98.0 72 116.9 3-019, 6-025
RX-243-3 — — — — — 243 110.2 81 116.9 9-025
RX-102-4 — — — — — — — — — —
RX-126-4 121.2 55.0 42 175.7 4-003, 4-023 — — — — —
RX-144-4 132.3 60.0 48 191.7 8-016 — — — — —
RX-162-4 — — — — — — — — — —
RX-216-4 — — — — — — — — — —
RX-264-4 — — — — — 264 119.7 88 155.9 4-011, 8-025
RX-288-4 — — — — — 288 130.6 96 155.9 4-019, 8-025
RX-324-4 — — — — — 324 146.9 108 155.9 12-025
• All RTS humidifier models operate at 50/60 Hz.
• For wire sizing, the highest leg draw is shown due to current imbalance.
• *600931 are the first digits of the heater part number.
• Maximum amps is determined based on the heaters used by each model. Some voltage/kW combinations show higher amperage values than
what the unit capacity will allow.

8RTS HUMIDIFIER RX SERIES INSTALLATION, OPERATION, AND MAINTENANCE MANUAL
Weights:
SPECIFICATIONS
Table 8-1:
RTS humidifier (RX-XX-1 and RX-XX-2) weights
RTS
model
No Enclosure Indoor Enclosure Outdoor Enclosure
Shipping Weight*
(Empty)
Operating Weight No
Enclosure
Shipping Weight*
(Empty) Operating Weight Shipping Weight*
(Empty) Operating Weight
lbs kg lbs kg lbs kg lbs kg lbs kg lbs kg
RX-6-1 91.3 41.5 135.5 61.6 92.9 42.2 137.1 62.3 301.3 137.0 345.5 157.0
RX-12-1 92.5 42.0 136.7 62.1 94.1 42.8 138.3 62.9 302.5 137.5 346.7 157.6
RX-18-1 93.7 42.6 137.9 62.7 95.3 43.3 139.5 63.4 303.7 138.0 347.9 158.1
RX-24-1 93.7 42.6 137.9 62.7 95.3 43.3 139.5 63.4 303.7 138.0 347.9 158.1
RX-30-1 93.7 42.6 137.9 62.7 95.3 43.3 139.5 63.4 303.7 138.0 347.9 158.1
RX-36-1 93.7 42.6 137.9 62.7 95.3 43.3 139.5 63.4 303.7 138.0 347.9 158.1
RX-42-1 94.1 42.8 138.3 62.9 95.7 43.5 139.9 63.6 304.1 138.2 348.3 158.3
RX-48-1 94.5 43.0 138.7 63.0 96.1 43.7 140.3 63.8 304.5 138.4 348.7 158.5
RX-63-1 95.4 43.4 139.6 63.5 97.0 44.1 141.2 64.2 305.4 138.8 349.6 158.9
RX-75-1 96.4 43.8 140.6 63.9 98.0 44.5 142.2 64.6 306.4 139.3 350.6 159.4
RX-30-2 131.6 59.8 245.9 111.8 132.6 60.3 246.9 112.2 341.6 155.3 455.9 207.2
RX-36-2 131.6 59.8 245.9 111.8 132.6 60.3 246.9 112.2 341.6 155.3 455.9 207.2
RX-48-2 135.6 61.6 249.9 113.6 136.6 62.1 250.9 114.0 345.6 157.1 459.9 209.0
RX-63-2 135.6 61.6 249.9 113.6 136.6 62.1 250.9 114.0 345.6 157.1 459.9 209.0
RX-75-2 139.6 63.5 253.9 115.4 140.6 63.9 254.9 115.8 349.6 158.9 463.9 210.8
RX-90-2 137.2 62.4 251.5 114.3 138.2 62.8 252.5 114.8 347.2 157.8 461.5 209.8
RX-102-2 138.0 62.7 252.3 114.7 139.0 63.2 253.3 115.1 348.0 158.2 462.3 210.1
RX-126-2 139.0 63.2 253.3 115.1 140.0 63.6 254.3 115.6 349.0 158.6 463.3 210.6
RX-144-2 140.0 63.6 254.3 115.6 141.0 64.1 255.3 116.0 350.0 159.1 464.3 211.0
RX-162-2 141.0 64.1 255.3 116.0 142.0 64.5 256.3 116.5 351.0 159.5 465.3 211.5
* Add approximately 46 lbs (21 kg) for packaging material.
RX-XX-1 and RX-XX-2

9
RTS HUMIDIFIER RX SERIES INSTALLATION, OPERATION, AND MAINTENANCE MANUAL
Table 9-1:
RTS humidifier (RX-XX-3 and RX-XX-4) weights
RTS model
No Enclosure Indoor Enclosure Outdoor Enclosure
Shipping Weight*
(Empty)
Operating Weight No
Enclosure
Shipping Weight*
(Empty) Operating Weight Shipping Weight*
(Empty) Operating Weight
lbs kg lbs kg lbs kg lbs kg lbs kg lbs kg
RX-63-3 166.0 75.5 422.9 192.2 193.5 88.0 450.4 204.7 476.3 216.5 733.1 333.2
RX-75-3 165.1 75.0 422.0 191.8 192.6 87.5 449.5 204.3 475.4 216.1 732.2 332.8
RX-90-3 169.6 77.1 426.5 193.9 197.1 89.6 454.0 206.4 479.9 218.1 736.7 334.9
RX-102-3 169.6 77.1 426.5 193.9 197.1 89.6 454.0 206.4 479.9 218.1 736.7 334.9
RX-126-3 170.8 77.6 427.7 194.4 198.3 90.1 455.2 206.9 481.1 218.7 737.9 335.4
RX-144-3 172.0 78.2 428.9 194.9 199.5 90.7 456.4 207.4 482.3 219.2 739.1 336.0
RX-162-3 173.2 78.7 430.1 195.5 200.7 91.2 457.6 208.0 483.5 219.8 740.3 336.5
RX-189-3 175.0 79.5 431.9 196.3 202.5 92.0 459.4 208.8 485.3 220.6 742.1 337.3
RX-216-3 176.2 80.1 433.1 196.9 203.7 92.6 460.6 209.4 486.5 221.1 743.3 337.9
RX-243-3 177.7 80.8 434.6 197.5 205.2 93.3 462.1 210.0 488.0 221.8 744.8 338.6
RX-102-4 168.7 76.7 425.6 193.4 196.2 89.2 453.1 205.9 479.0 217.7 735.8 334.5
RX-126-4 173.5 78.9 430.4 195.6 201.0 91.4 457.9 208.1 483.8 219.9 740.6 336.6
RX-144-4 174.7 79.4 431.6 196.2 202.2 91.9 459.1 208.7 485.0 220.4 741.8 337.2
RX-162-4 176.3 80.1 433.2 196.9 203.8 92.6 460.7 209.4 486.6 221.2 743.4 337.9
RX-216-4 179.5 81.6 436.4 198.4 207.0 94.1 463.9 210.9 489.8 222.6 746.6 339.4
RX-264-4 181.9 82.7 438.8 199.4 209.4 95.2 466.3 211.9 492.2 223.7 749.0 340.5
RX-288-4 183.5 83.4 440.4 200.2 211.0 95.9 467.9 212.7 493.8 224.4 750.6 341.2
RX-324-4 185.5 84.3 442.4 201.1 213.0 96.8 469.9 213.6 495.8 225.3 752.6 342.1
* Add approximately 46 lbs (21 kg) for packaging material.
Weights:RX-XX-3 and RX-XX-4
SPECIFICATIONS

10 RTS HUMIDIFIER RX SERIES INSTALLATION, OPERATION, AND MAINTENANCE MANUAL
Water
SPECIFICATIONS
UNIVERSAL WATER
DriSteem's RTS humidifier RX series incorporates universal water control for use
with any water type (well, tap, softened, DI or RO water). There is no need to
change control configurations based on water type when ordering equipment
or retrofitting to fit new water sources in the field. The water level control
algorithm monitors water quality and any changes over time to assure the user
of accurate control no matter the type of water that is used.
Water level
is controlled
electronically using
three probes
Full
Overflow/foam detection
FIGURE 10-1: WATER LEVEL CONTROL
VLC-OM-030
Low
Supply water guidelines
Supply water quality is an important component
of humidifier reliability and maintenance.
Examples:
• Corrosive water can decrease the service life
of the humidifier.
• Excessive water hardness can increase the
humidifier maintenance requirements.
To maximize humidifier service life and
minimize humidifier maintenance, DriSteem has
established guidelines for supply water. See
Table 10-1.
Table 10-1:
DriSteem supply water guidelines
Chlorides*
Tap water
RO/DI water
Softened water
* Damage caused by
chloride corrosion is
not covered by your
DriSteem warranty.
< 50 ppm
< 5 ppm
< 25 ppm
Total hardness
Tap water < 500 ppm
(29 gpg)
pH
Tap water
RO/DI, softened water
6.5 to 8.5
7.0 to 8.0
Silica < 15 ppm
Supply water outside of the guidelines
may void your DriSteem warranty.
Please contact your DriSteem
Representative or DriSteem Technical
Support if you need advice.
Table 10-2:
Fill and drain rates*
RTS tank size
Maximum
drain rate
(gpm)
Drain
time, un-
tempered
(minutes)
Drain
time,
tempered
(minutes)
Fill rate
(gpm)
Fill time to
mid probe
(minutes)
Operating water
volume
Tank
volume
(gallon)
Tank
volume
(liters)
RX-6-1, RX-12-1,
RX-18-1, RX-24-1,
RX-30-1, RX-36-1,
RX-42-1, RX-48-1,
RX-63-1, RX-75-1
8 2 4 3.3 2 5 18.9
RX-30-2, RX-36-2,
RX-48-2, RX-62-2,
RX-75-2
11 4 8 3.3 4 13.5 51.1
RX-90-2, RX-102-2,
RX-126-2, RX-144-2,
RX-162-2
11 4 8 3.5 4 13.5 51.1
RX-63-3, RX-75-3 12 8 16 3.3 9 29.5 111.7
RX-90-3, RX-102-3,
RX-126-3, RX-144-3,
RX-162-3, RX-102-4,
RX-126-4, RX-144-4,
RX-162-4
12 8 16 3.5 8 29.5 111.7
RX-189-3, RX-216-3,
RX-243-3, RX-216-4,
RX-243-4
12 8 16 3.8 8 29.5 111.7
RX-264-4, RX-288-4,
RX-324-4 12 8 16 4.3 7 29.5 111.7
*Fill and drain rates are approximate

11
RTS HUMIDIFIER RX SERIES INSTALLATION, OPERATION, AND MAINTENANCE MANUAL
SPECIFICATIONS
Indoor and no enclosure dimensions (RX-XX-1 and RX-XX-2)
OM-8076
Top view
Back view
Front view
Bottom view
MDoor access
Electrical knockout
Touch
screen
Steam outlet
Mounting holes (4)
E
C
AQ
R
B
D
Probe
K
F
H
LN
J & G
0.75” (DN 20) NPT/BSP fill
1” (DN25) NPT/BSP drain
FIGURE 11-1: RTS HUMIDIFIER DIMENSIONS
See Table 12-1 for dimension.

12 RTS HUMIDIFIER RX SERIES INSTALLATION, OPERATION, AND MAINTENANCE MANUAL
SPECIFICATIONS
Table 12-1:
Indoor unit dimensions
Description RX-XX-1 RX-XX-2
inches mm inches mm
A Overall length 24.8 629 26.1 663
B Overall width 16.4 416 21.0 533
C Overall height 24.9 632 31.4 798
DSteam outlet 11.3 286 11.9 301
E 2.8 70 3.3 83
FSupply water 1.6 41 3.0 76
G 2.6 66 1.6 41
HDrain water 4.0 102 3.0 76
J 2.6 66 4.0 102
KElectrical knockout (Control) 8.8 224 2.8 71
L 9.1 231 10.1 256
MElectrical knockout (Power) 2.8 71 8.8 224
N 9.6 244 9.4 239
QMounting holes 16.0 406 16.0 406
R21.3 541 28.0 711
Indoor Indoor and no enclosure dimensions (RX-XX-1 and RX-XX-2)

13
RTS HUMIDIFIER RX SERIES INSTALLATION, OPERATION, AND MAINTENANCE MANUAL
SPECIFICATIONS
Indoor and no enclosure dimensions (RX-XX-3 and RX-XX-4)
FIGURE 13-1: RTS HUMIDIFIER DIMENSIONS
Table 13-1:
Indoor unit dimensions
Description RX-XX-3 & RX-XX-4
inches mm
A Overall length 37.4 950
B Overall width 21.6 549
C Overall height 41.3 1049
DSteam outlet 31.2 792
E 5.3 135
FSupply water 4.4 112
G 4.3 109
HDrain water 4.7 119
J 7.2 183
KElectrical knockout 8.3 211
L 4.2 107
OM-8077
Top view
Back view
Front view
L
Touch
screen
keypad
Steam outlet
E
C
A
B
D
Fill
H
G
K
Side view
Door access
F
J
Electrical
knockout
Drain
Probe

14 RTS HUMIDIFIER RX SERIES INSTALLATION, OPERATION, AND MAINTENANCE MANUAL
Location and clearance recommendations (Indoor and no enclosure)
FIGURE 14-1: RX SERIES CLEARANCE RECOMMENDATIONS FOR -1 AND -2 MODELS (INDOOR AND NO ENCLOSURE UNITS)
Top (when SDU is not mounted directly above the RTS humidifier): 24"(610 mm)
Right side:
6" (152 mm)*
Supporting wall
Front electrical controls:
36" (915 mm)
Floor: 24" (610 mm)
Left side: 2" (51 mm)
Secured to supporting wall
To dispersion assembly
OM-8041
Maintain these clearances for service and maintenance.
INSTALLATION
* If there is more space available, increase the clearance on this side of the unit. Infrequent
access may be required to the hoses behind the electrical cabinet.

15
RTS HUMIDIFIER RX SERIES INSTALLATION, OPERATION, AND MAINTENANCE MANUAL
Location and clearance recommendations (Indoor and no enclosure)
FIGURE 15-1: RX SERIES CLEARANCE RECOMMENDATIONS FOR -3 AND -4 MODELS (INDOOR AND NO ENCLOSURE UNITS)
Top: 24"(610 mm)
Right side:
24" (610 mm)
Electrical controls
Front:
36" (915 mm)
Left side: 2" (51 mm)
To dispersion assembly
OM-8078
Maintain these clearances for service and maintenance.
INSTALLATION
Back side: 2" (51 mm)

16 RTS HUMIDIFIER RX SERIES INSTALLATION, OPERATION, AND MAINTENANCE MANUAL
Selecting a location
When selecting a location for the humidifier, consider the
following:
PROXIMITY TO THE DUCT
Install the humidifier near the air duct system where
the dispersion assembly will be located. The maximum
recommended length for steam hose connecting a single
humidifier to a dispersion assembly is 10' (3 m). The
maximum recommended developed length for tubing
connecting a single humidifier to a dispersion assembly is
20' (6 m).
ELEVATION OF THE INSTALLED DISPERSION ASSEMBLY
The recommended installation location for the dispersion
assembly is at an elevation higher than the humidifier.
However, if the dispersion assembly must be installed at
an elevation lower than the humidifier, install a drip tee
and drain.
Before installing a dispersion assembly or interconnecting
piping, review all pitch requirements.
REQUIRED CLEARANCES
See Figures 14-1 and 15-1.
ELECTRICAL CONNECTIONS
Electrical power supply connections are at the lower right
side of the unit. See “Wiring” on Page 32.
SUPPLY WATER AND DRAIN PIPING CONNECTIONS
Water supply piping and drain connections are at
the lower right rear corner of the unit. See the piping
illustrations and instructions starting on Page 19.
EXTERIOR WALL INSULATION
Install the humidifier on an exterior wall only if the wall is
properly insulated.
DISPERSION CONTROL DEVICES
See the specific dispersion installation, operation, and
maintenance manual for recommended installation
locations for the dispersion assembly and associated
control devices.
Removable
evaporating
chamber
cover
Electrical
area
Flexible steam
hose or tubing
connects to
dispersion tube(s)
or to an SDU
Duct
Single
dispersion
tube with
condensate
return
Water fill
Drain
FIGURE 16-1: INSTALLATION OVERVIEW
INSTALLATION
WARNING
Plenum
Do not mount the RTS humidifier in
the plenum of a building. Installing
within the plenum can cause property
damage.
OM-8042
Incoloy alloy-sheathed
immersion heaters