Sussman MrSteam CU Series Instruction manual

MrSteam
®
CU Series Steambath Generators
Installation,Operation & Maintenance Manual
!
CAUTION
TABLE OF CONTENTS
Before Installing . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
Steam Room Requirements . . . . . . . . . . . . . . . . . . . .2
Locating the Steambath Generator . . . . . . . . . . . . . .3
Dimensional & Clearance Specifications . . . . . . . . . .4
Selecting the Steambath Generator . . . . . . . . . . . . .5
Installation
Plumbing, Water Supply, Steam Line, Steam Head,
Acrylic Shield . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
Drain, Safety Valve . . . . . . . . . . . . . . . . . . . . . . . . . .7
Electric . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
Control Circuit Wiring Diagrams . . . . . . . . . . . . . . . .9-12
F1 Plus
Kit Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
Control Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Operating Temperature Sensor Installation . . . . . . . . . . . . . . 15
High Limit Operating Temperature Sensor Installation . . . .
15
CU-HL Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
Automatic Blowdown System
Kit Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
Auxiliary Manual Reset Low Water Cutoff . . . . . . . . .19
Principles of Operation . . . . . . . . . . . . . . . . . . . . . .20
Operating and Testing
Automatic Blowdown, F1 Plus Control, CU-HL . . . . .21
Warning Signs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22
Pre-Operation Check . . . . . . . . . . . . . . . . . . . . . . . .22
Operation
Automatic Blowdown Instructions . . . . . . . . . . . .23
Manual Blowdown Instructions . . . . . . . . . . . . . .23
Maintenance Instructions . . . . . . . . . . . . . . . . . . . .24
24-hour and 7-day Time Switches . . . . . . . . . . . . . .25
Water Gauge & Gauge Glass Installation . . . . . . . .26
Use and Care . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27
Trouble Shooting . . . . . . . . . . . . . . . . . . . . . . . . . .28
Check
PC Boards, Probes, Steam Solenoid Valve,
F1 Plus Control, Heating Element . . . . . . . . . . . . .29
Element Replacement Instructions . . . . . . . . . . . . .30
CU 360 –CU 1400 . . . . . . . . . . . . . . . . . . . . . . . . .31
CU 2000 – CU 4500 . . . . . . . . . . . . . . . . . . . . . . . .32
Replacement Parts List . . . . . . . . . . . . . . . . . . . .33-34
A Division of Sussman-Automatic Corporation
43-20 34th Street, Long Island City, NY 11101
[phone] • 1-800 767- 8326
Fax: [phone] • Website: www.mrsteam.com
Email: [email protected]
signals a situation where injury or product damage
may occur if you do not follow instructions.
states a hazard may cause serious injury or death if
precautions are not followed.
Typical CU Series Steambath Generator
(for illustrative purposes only)
_________________
IMPORTANT NOTE:
As you follow these instructions, you will notice
warning and caution symbols. This information is
important for the safe and efficient installation and
operation of this steam generator. There are two
types of potential hazards that may occur during this
installation and operation:
!
WARNING
PUR 100376 08/03
Western Regional Offices
9410 S. La Cienega Blvd. Los Angeles CA 90301
[phone] • 1-800 727-8326
Fax: [phone]
MODELS:
CU-360 through
CU-4500

IMPORTANT:
Take time to read these instructions thoroughly before installing or servicing. Although this
CU Steambath Generator has been qualified for shipment by MrSteam, the following must be reviewed for
proper and safe use.
1. Verify that the model and accessories are as specified and ordered.
2. Verify that the power voltage and control voltage at the site is suitable for the CU Steambath Generator.
3 .Verify the correct steam generator sizing by referring to the MrSteam sizing guide. See page 5.
4. Do NOTuse black iron pipe or galvanized pipe for the steam line. Use brass pipe or copper tubing only, and in accor-
dance with National and local plumbing Codes.
5. The physical size of the unit, clearance for plumbing servicing and its distance from the steam room must be all consid-
ered before selecting a location for the generator. See pages 4 & 5.
6 .The Manufacturer's Data Report is supplied with the generator.This is an important document and may be required by a
State or Provincial Agency. THIS DOCUMENT MUST BE SECURED IN A SAFE LOCATION.
7. Do not use or install unauthorized components, accessories or products on the generator or generator piping.
IMPORTANT: The MrSteam F1 Plus System operating and high limit temperature controls are to be installed in accor-
dance with the specific instructions provided. See Note 7 below.
IMPORTANT: The following general information should be used in conjunction with your architect, designer and con-
tractor in determining all factors necessary in providing a suitable and safe steam room environment for your bathers.
IMPORTANT: Owners/operators should obtain a copy and familiarize themselves with the latest edition of the American
College Sports Medicine Health/Fitness Faculty Standards and Guidelines, or a similar resource and reference publication, and
refer to those guidelines for the proper and safe operation of a spa facility including steamrooms.
Steamroom construction information is available from the Tile Council of America, Inc. at [phone] or www.tileusa.com
1. Steam room must be completely enclosed, with full walls, door, floor and ceiling.
2. It is recommended that a gasketed door be used for heat sealing and steam containment.Windows, skylights and the like
that are part of the steam room should be double paned. Only vapor sealed lighting fixtures approved for the application
should be used.
3. If tile-type or other smooth surface flooring is used, provide suitable anti-skid strips or equivalent, to
prevent user slipping and injury.
IMPORTANT
4.
Walls and ceilings must be constructed with water-resistant, non-corrosive surface, such as tile, marble, molded acrylic, or
other non-porous material.The ceiling should be sloped to prevent dripping of condensate on bathers. If acrylic, fiberglass
or other non-heat resistant materials are used as part of the steamroom enclosure, see page 6,“Steamhead” and “Acrylic
Shield” for important additional details.
5. Provide floor drains for condensate run-off and steamroom cleaning.
6. Comply with all applicable National and local building and electrical Codes and confer with design consultants and con-
tractors for room construction details.
7. The F1 Plus Temperature Control System is required operating equipment for each steam room.The
operating temperature control is to be set by the owner/operator to sense desired room temperature at the sensor loca-
tion within the steam room. Installation of the F1 Plus System high limit room temperature sensor and control is manda-
tory to provide additional protection to the bathers.The steam room is to be operated in accordance with “Important”
information as noted above.
IMPORTANT: Final selection of the steam room temperature setting is at the discretion of the owner/operator.
Before Installing
Steam Room Requirements
MrSteam CU Series Installation, Operating & Maintenance Manual
2
!
CAUTION
!
CAUTION

MrSteam CU Series Installation, Operating & Maintenance Manual
Locating the Steam Generator Unit
3
MrSteam Installation
STEAM ROOMUTILITY ROOM
Figure 1
Steam Solenoid
Steam
Generator
Fully Insulated
Steam pipe F1 Plus Sensor
High Limit Sensor
!
CAUTION
!
CAUTION
!
CAUTION
!
WARNING
1. MrSteam®CU commercial steambath generators are designed to NEMA Type 1 requirements
and are intended for indoor use only.They are to be located indoors in a dry, clean location
and are not to be subjected to moisture, condensate, hose wash down or the like.
2. Do not install steambath generator outdoors or wherever environmental conditions may effect
the safety and/or performance of the generator.
3. Do not install steambath generator in locations such as unheated attics or basements, or where
water could freeze.
4. Do not install steambath generator near flammable or corrosive materials, or chemicals such as
gasoline, paint thinners, or the like. Installation in areas having high concentrations of chlorine
(such as pool equipment room) must be avoided.
5. IMPORTANT: Select a location for steam generator in accordance with items 1-4 above and within 25 feet of the
steam room. Reference “Dimensional & Clearance Specifications
” information on page 4. See page 5 for guidance if
generator is more than 25 feet from steam room.
6. Install steambath generator on a solid and level surface. See Pages 4 and 5 for additional details.
7. Provide access to the steambath generator for servicing. See page 4 for Dimensional & Clearance Specifications
8. IMPORTANT: Steam line, safety valve and drain valve and plumbing, and steamheads become hot during operation
and remain hot after shutdown for a period of time. Provide appropriate protection, including insulating plumbing lines.
Avoid plumbing runs and steam head locations that can come in contact with service personnel and bathers. See page 6.
9. Each steamhead must be located away from the bather seating areas and traffic patterns.
IMPORTANT: A LOCKED UTILITY ROOM THAT ONLY PERMITS ACCESS TO THE STEAM GENERATOR AND
ITS CONTROLS BY AUTHORIZED PERSONNEL AND IS NOT ACCESSIBLE TO THE GENERAL PUBLIC IS STRONGLY
RECOMMENDED.
!
WARNING
For Illustrative Purposes Only
NOTE: For illustrative purposes only. Consult with qualified designer, architect or contractor
for steam room construction details, including location of steam head(s) and sensors.

MrSteam CU Series Installation, Operating & Maintenance Manual
Dimensional & Clearance Specifications
4
Figure 2: Typical Arrangement. For illustration purposes only.
Refer to all notes below
NOTES for Figure 2:
1. IMPORTANT:
Allow minimum of 36" all around for servicing
2. All dimensions are approximate. Refer to chart on Page 5.
3. MM150 Liquid Level Control on CU-2000 and larger models only. CU-360 to CU-1400 have electronic liquid
level controls.
4. IMPORTANT: Minimum clearance from combustible surfaces. Refer to Fig. 2 above for legend.
A 1" above top of CU generator
B Front of CU generator suitable for alcove installation only.
D 1" from rear of CU generator.
EL 1 " from left side of CU generator.
ER 16" from right side of CU generator.
F Type of flooring: "C", suitable for combustible flooring.
Steam Outlet High Limit
Pressure
Control
Operating
Pressure
Control
Pressure
Gauge 15 PSIG
Safety Valve
MM 150 Liquid
Level Control
(see note 3)
MM 150 Drain Valve
Water Feed Inlet
F
EL
D
A
B
ER
FrontLeft
Drain Valve
On/Off
Switch
Gauge Glass
Assembly
Height
Width Length

MrSteam CU Series Installation, Operating & Maintenance Manual
5
Selecting a MrSteam
CU Series Generator
The resultant calculated volume of the steam room determines the Model CU steambath generator required. Steam
room size and additional constructional factors affect model selected.
A. To determine the steam room volume first multiply Length x Width x Height of the steam room.
_______________________________________________________________________________________________
Example: A steam room 8' x 9' x 8' = 576 Cu.Ft. (volume).
Select the MrSteam Model which is the next larger volume. In this example, Model CU-750 is the correct selection.
Example: 2 Steam rooms each 6' x 10' x 7' x 2 rooms = 840 Cu. Ft. (volume).
In this example, Model CU-1000 is the correct selection.
NOTE: Insure adequate consideration is given to assure that the CU unit selected is not undersized for the room.
_______________________________________________________________________________________________
B. NOTE: Certain additional factors effect the correct sizing of the steambath generator:
1. Construction materials such as glass or glass block, natural marble or other stones: Increase volume.
2. Piping runs longer than 25 feet from the steambath generator to the steam room: Increase volume.
3. Exterior walls and outside windows: Increase volume.
4. Steam room with interior height in excess of 8 feet: Increase volume
_______________________________________________________________________________________________
C.
IMPORTANT:
The above selection guidelines are recommendations only. Always consult with contractor
designer or architect. For general information, contact East Coast: 1-800-767-8326 or West Coast: 1-800-727-8326.
_______________________________________________________________________________________________
D.
IMPORTANT:
When specifying a CU Commercial Steambath generator the following is strongly recommend-
ed for best performance and user satisfaction.
1. One CU steambath generator should service no more that two (2) steam rooms, each relatively similar in size and
construction.
2. If two (2) steamrooms are serviced by one (1) CU generator, the combined resultant room volume of the two
rooms should not exceed 1000 cubic feet.
3. Each room must be operated with the appropriate F1 Plus temperature control system inclusive of the room oper-
ating temperature control and the high-limit temperature control.
4. In any case, the purchase and/or owner/operator must consult with a designer, architect, and/or consultant to
assure the proper specification of the steam generator.
Model No. KW Maximum* Water Inlet Steam Generator Dimensions (inches) Shipping
Room Volume Size NPT Outlet Size, NPT Width Length Height Wt.Lbs.
Cubic Feet
_______________________________
CU-360 9 400 1/2" 1" 20 20 38 250
____________________________________________________________________________________________________
CU-500 12 500 1/2" 1" 20 20 38 250
____________________________________________________________________________________________________
CU-750 18 750 1/2" 1" 20 20 38 250
____________________________________________________________________________________________________
CU-1000 24 1000 1/2" 1" 20 30 38 270
____________________________________________________________________________________________________
CU-1250 30 1250 1/2" 1" 20 30 38 290
____________________________________________________________________________________________________
CU-1400 36 1400 1/2" 1" 20 30 38 300
____________________________________________________________________________________________________
CU-2000 48 2000 1/2" 1" 24 33 44 330
____________________________________________________________________________________________________
CU-2500 60 2500 1/2" 1" 24 33 44 380
____________________________________________________________________________________________________
CU-3000 72 3000 1/2" 1" 24 33 44 390
____________________________________________________________________________________________________
CU-4500 108 4500 3/4" 1-1/2" 28 34 59 625
* After taking into consideration all factors affecting resultant steam room volume, including materials of construction, dis-
tance from generator to steam room, interior height of steam room ceiling, outside/exterior walls and windows etc., select
proper Model CU generator. Consult with architect, designer and contractor before making final selection.

MrSteam CU Series Installation, Operating & Maintenance Manual
Installation
6
Plumbing
All plumbing shall be performed by a qualified licensed plumber and in accordance with applicable National and local Codes.
Water Supply
1. Connect to hot or cold water line. A hot water line is preferable, however incoming hot water should not exceed 160° F.
IMPORTANT: The low temperature setting on many hot water heaters provides 120°F water
2. Provide a service shut off valve and water-line strainer in the water supply line upstream to the steambath generator
3. Flush the inlet water line thoroughly before making connection to the steambath generator.
4. Incoming water supply should be at least 25 psig and is not to exceed 100 psig.
5. Install a back flow preventor as required by Code.
6. Provide anti-water hammer device as required in accordance with Code.
7. Use of unions in plumbing lines is strongly recommended.
8. Recheck all factory and field plumbing connections for tightness.
Steam Line
1. The F1 Plus steam solenoid valve should be plumbed as close as practical to the steam room using brass pipe or copper
tubing.
2. Pitch the steam line a minimum of 1/4” per linear foot of run, towards the steam outlet on the generator, to avoid valleys
and trapping of condensate.
3. Fully insulate steam lines with suitably-rated high temperature insulation.
4. Install a suitable strainer or filter between the steam generator and steam solenoid valve.
5. Use of unions in plumbing lines is recommended.
Steam Head (3/4” N.P.T.)
1. For steam rooms constructed of tile, marble or similar non-porous heat-resistant materials for the enclosure, locate steam
head 12 inches above steam room floor and install MrSteam PN: CU-103412 acrylic shield on each steamhead.
IMPORTANT: For Steam rooms using acrylic, fiberglass or other non-heat resistant materials used for steam room enclo-
sure, install each steam head 20-30 inches above the floor.
2. Locate each steam head away from bather seating area and away from traffic patterns.
3. Install each steam head with steam slot facing downward, towards floor. See Diagram A.
4. NOTE: To preserve the steam head finish, do not use wrench or other tools to tighten. Use of proper thread sealant and
hand tightening is usually sufficient.
Acrylic Shield
1. Place an Acrylic Shield (supplied) on each steamhead as shown.
Operation of the steamroom without an acrylic shield may expose users or surfaces to hot steam.
Do not operate steam room without an acrylic shield on each steamhead.
IMPORTANT: Do not use with water soluble fragrance or fragrance containing emulsifiers or aldehydes.
Acrylic Shield damage may result. MrSteam oils are approved for use with this acrylic shield.
!
WARNING
Steam Supply Pipe Steam Head
3/4"
1/4" minimum clearance
required for Acrylic Shield
Fill gap with silicone or
equal sealant as required
for moisture seal.
Finished interior face
of steam room wall
Use Teflon or equal
sealant on pipe threads
Acrylic Shield
Steam Head
Condensation Slot
(downward facing)
Diagram A

Electric shock hazard. Disconnect all power supplies at the main disconnect
switch before proceeding. All electrical wiring must be installed by a qualified
licensed electrician in accordance with National and local Codes.
The steambath generator is factory wired and pre-tested before shipment. Electrical power supply details are provided on
the data plate secured to the generator and as part of this manual. Refer to applicable wiring and schematic information.
1. Check power and control circuit voltage requirements on the data plate.
NOTE: Separate 120 VAC line is not required if optional 120 VAC control transformer has been purchased and provided
as factory equipment.
2. Use minimum 90°C insulated copper conductors only for field wiring,sized in accordance with National and local electric
Codes. Refer to Amperage Chart below.
3. Connect suitably sized copper equipment grounding conductor in accordance with National and local electric Codes to
ground terminal provided.
4. Install a separate dedicated circuit breaker or other approved overcurrent protection device between the incoming
electrical supply and the generator, in accordance with National and local electric Codes.
5. IMPORTANT: With main disconnect switch off and no electric power entering the generator,tighten all e lectrical
connections including all factory connections at the terminal block, fuse block, top and bottom of contactor and element
pins prior to energizing generator.
AMPERAGE CHART -
Indicates Total Ampere Draw of Specific CU Model at Voltage & Phase Specified
_______________________________
Model No. KW 208V/1 PH 208V/3 PH 240V/1 PH 240V/3 PH 480V/3 PH 600V/3 PH
_______________________________
CU-360 9 44 25 38 22 11 9
___________________________________________________________________________________________________
CU-500 12 58 34 50 29 15 12
___________________________________________________________________________________________________
CU-750 18 87 50 75 44 22 18
___________________________________________________________________________________________________
CU-1000 24 116 67 100 58 29 24
___________________________________________________________________________________________________
CU-1250 30 145 84 125 73 37 29
___________________________________________________________________________________________________
CU-1400 36 - 100 - 87 44 35
___________________________________________________________________________________________________
CU-2000 48 - 134 - 116 58 47
___________________________________________________________________________________________________
CU-2500 60 - 167 - 145 73 58
___________________________________________________________________________________________________
CU-3000 72 - 200 - 174 87 70
___________________________________________________________________________________________________
CU-4500 108 - 300 - 260 130 104
IMPORTANT: Use minimum 90˚ C insulated copper conductors only for field wiring sized in accordance with
National and local electric Codes.
NOTE: Consult factory for other voltage/phase combinations. CU generators are suitable for 50/60 hz. Standard control
circuit voltage for above V/PH combinations for United States, Canada and Mexico is 120 VAC. Exception: 220-240 VAC control
circuit voltage is provided on non-domestic product where power voltage is 220-240 V/3 PH, 380V/3PH, 415V / 3 PH, etc.
Electric
MrSteam CU Series Installation, Operating & Maintenance Manual
7
Installation (cont.)
!
CAUTION
Drain
In accordance with Code requirements, provide a drain line connection from the steambath generator drain valve(s).
If an Auto Blowdown is used, the drain line must be connected to the automatic blowdown valve. Refer to National and
local plumbing Codes for drain requirements, including receptor, trap, vent requirements and drain lines.
Safety Valve
Where permitted by Code, provide a connection for safety valve discharge.
DO NOT connect a shut off valve or plug at the safety valve outlet.
DO NOT reduce outlet size of safety valve discharge.
!
WARNING

MrSteam CU Series Installation, Operating & Maintenance Manual
Wiring
8
To avoid possible electric shock, the steambath generator shall be suitably
grounded in accordance with National Electric and local Codes. Disconnect all
power supplies at the main disconnect switch before proceeding.
1. Electric wiring to the steambath generator must be in accordance with National Electrical and local wiring Codes
following wiring diagram supplied. Such wiring shall be done by a licensed electrician. See Amperage Chart and
Notes, Page 7.
2. The unit is wired and pre-tested before shipment. Follow all instructions provided for safely and properly wiring
steambath generator and accessories.
Installer shall use a safety switch of adequate capacity employing suitably-
rated circuit breakers or fuses between main electrical power source(s)
and the generator. Location of safety switch to be in accordance with National and local
electric codes.
3. IMPORTANT: Insure all electrical connections are sufficiently tightened prior to energizing generator. See
Page 7, Item 5.
Substitution of components or modification of wiring systems voids
warranty and can lead to dangerous operating conditions.
4. The F1 Plus Temperature Sensor and High Limit Temperature sensor(s) must be located inside the steam room.
Locate approximately 5 feet above the steam room floor, preferably away from steam heads.
5. The F1 Plus steam solenoid valve(s) shall be located outside the steam room and shall be wired to the F1 Plus con-
troller(s) in accordance with wiring diagram provided. See applicable wiring diagrams included as part of this manual
Typical Power Wiring Diagram
IMPORTANT: Also refer to Control Circuit diagrams in this manual.
3PH Power Supply
Power Contactor
Heating Element
Diagram #1
Units with 1 Contactor (see note 1)
3PH Power Supply
Power Terminal Block
Power Contactors
Heating Elements
Diagram #2
Units with 2 or more Contactors (see note 1)
!
CAUTION
!
CAUTION
!
WARNING
GRD
GRD
__ __ __ __ Field Wiring
__________ Factory Wiring

MrSteam CU Series Installation, Operating & Maintenance Manual
Control Circuit Wiring Diagram
9
SEE PGS. 10 & 11 FOR DIAGRAMS
NOTES:
1. Larger rooms may require two or more steam solenoid valves in parallel.
2. When generator services two rooms, second room requires a set of F1 Plus solenoid valves and CU-HL.
IMPORTANT:
3. F1 Plus sensors are intended to be field installed within the steam room at the location selected by the
designer/architect.
4. Autoflush System 24 hr. timer and F1 Plus operating settings are at the discretion of the owner/operator.
IMPORTANT:
Owners/operators should obtain a copy and familiarize themselves with the latest edition of the American College Sports
Medicine Health/Fitness Faculty Standards and Guidelines, or a similar resource and reference publication, and refer to
those quide lines for the proper and safe operation of a spa facility including steamrooms. Steam room construction infor-
mation is available from the Tile Council of America, Inc. at [phone] or www.tileusa.com.
The F1 Plus Temperature Control System is required operating equipment for each steam room.
The operating temperature control is to be set by the owner/operator to sense desired room tempera-
ture at the sensor location within the steam room. Installation of the F1 Plus System high limit room tem-
perature sensor and control is mandatory to provide additional protection to the bathers.The steam
room is to be operated in accordance with “Important” information as noted above.
IMPORTANT:
Final selection of the steam room temperature setting is at the decision of the owner/operator.
!
CAUTION

MrSteam CU Series Installation, Operating & Maintenance Manual
Control Circuit Wiring Diagram
10
F1 Plus Temperature Control System and optional automatic blowdown assembly
For Models: CU-1000AB3, CU-1000AC3, CU-1250AB3, CU-1250AC3, CU-1400AB3, CU-1400AC3
LEGEND
Factory Wiring
Field Wiring
120VAC Input
L N GND
2nd CU-HL
R
B
W
CU-HL
R
B
W
Remove Jumper
for CU-HL
High Probe
6" PUR
Rod
Low
9" Probe RED
Rod
High No Rod PINK
Water
Probe
GRN/YEL
Top of Pressure Vessel
High Limit Operating
Pressure Control Pressure Control
WHT
Ground
WHT
BLK
Steam
Solenoid
Valve
S
Remove
Jumper for
Optional Timer
BLK
WHT
YEL YEL
ON/OFF Switch
BLK BR
BLK
YEL
WHT WHT
WHT
GRN/YEL
Contactor Contactor
GRN/YEL
WHT
Remove BR BLK
Jumper for
AutoFlush
Timer
Pilot Light
RED
BLK
PUR RED
BLU
Motorized
Blowdown
Valve (CU81600)
WHT
BLU Automatic
RED Blowdownc
GRN/YEL (optional)
S WHT
BLU
Blowdown GRN/YEL
Valve
(CU81500)
BLK
BLK
FILL
HTR YEL
H
L L1 BLK
C L2
GRN/YEL WHT
Low High Com
NO NC COM Input
WHT
YEL YEL
GRN BLK
L1 L2
LLCO G
NC
COM
Reset NO
Manual Reset
Auxiliary Low Water Cutoff (optional)
Sensor
F1 Plus
Temperature Controller
F1 Plus
Kit
2nd Steam
Solenoid
Valve
Remove
Jumper for S
2nd Optional
Timer
S
Water Feed
Solenoid Valve
Remove
Jumper for
AUX LWCO
Sensor
F1 Plus
Temperature Controller
Side
Probe
2nd F1
Plus Kit
WHT BLK BRN WHT
WHT BLK BRN WHT

MrSteam CU Series Installation, Operating & Maintenance Manual
Control Circuit Wiring Diagram
11
F1 Plus Temperature Control System and optional automatic blowdown assembly
For Models: CU-360A TO CU-750A, CU-1000AF3, CU-1250AF3, CU-1400AF3
LEGEND
Factory Wiring
Field Wiring
120VAC Input
L N GND
2nd CU-HL
R
B
W
CU-HL
R
B
W
Remove Jumper
for CU-HL High Limit Operating
Pressure Control Pressure Control
WHT
Ground
YEL YEL
ON/OFF Switch
BLK BR
BLK
WHT WHT
GRN/YEL
Contactor
GRN/YEL
WHT
Remove BR BLK
Jumper for
AutoFlush
Timer
Pilot Light
RED
BLK
PUR RED
BLU
Motorized
Blowdown
Valve (CU81600)
WHT
BLU Automatic
RED Blowdownc
GRN/YEL (optional)
SWHT
BLU
Blowdown GRN/YEL
Valve
(CU81500)
5 4 3 2 1
High Probe
6" PUR
Rod
Low
9" Probe RED
Rod
High No Rod PINK
Water
Probe
GRN/YEL
Top of Pressure Vessel
WHT
BLK
Steam
Solenoid
Valve
S
WHT BLK BRN WHT
Remove
Jumper for
Optional Timer
BLK
WHT
Sensor
F1 Plus
Temperature Controller
F1 Plus
Kit
2nd Steam
Solenoid
Valve
Remove
Jumper for S
2nd Optional
Timer
S
Water Feed
Solenoid Valve
Remove
Jumper for
AUX LWCO
Sensor
F1 Plus
Temperature Controller
Side
Probe
2nd F1
Plus Kit
BLK
BLK
FILL
HTR YEL
H
L L1 BLK
C L2
GRN/YEL WHT
Low High Com
NO NC COM Input
WHT
YEL YEL
GRN BLK
L1 L2
LLCO G
NC
COM
Reset NO
Manual Reset
Auxiliary Low Water Cutoff (optional)
WHT BLK BRN WHT

MrSteam CU Series Installation, Operating & Maintenance Manual
Control Circuit Wiring Diagram
12
L N GND
Ground
Control Supply
120 Volts 1PH 60Hz
Control Terminal Block
Sensor
Part No. 103731-1 Steam Solenoid
Valve CU-99285A
Terminal
Block
F1 Plus Control Package
Typical F1 Plus
Water Feed
Solenoid Valve
C1
P P C2
Red Black Orange
White Black
N
L
120 VAC Input
Operating
Pressure Control Contactor
High Limit
Pressure Control
Side Probe
Optional CU 81600
AutoFlush System
Remove Jumper
for CU-HL
Open
Close
103805
24-hr. Timer Optional
Timer
Location
99353
Delay Timer
ON/OFF Switch
with Pilort Light
103661
Blowdown Valve
2nd
CU-HL
CU-HL
120V F1 Plus
Electronic Temperature Controller
PN 103730
S
1 2
R
5
3 4
8 1
T5
7 6
4 2
2
1
3
LEGEND
Factory Wiring
Field Wiring
IMPORTANT:
1. F1 Plus sensors are intended to be field installed within the steam room at the location selected by the designer/architect.
2. Autoflush System 24 hr. timer and F1 Plus operating settings are at the discretion of the owner/operator.
IMPORTANT: Owners/operators should obtain a copy and familiarize themselves with the latest edition of the
Models CU-2000 and higher with F1 Plus Temperature Control System and
Optional Automatic Blowdown Assembly

MrSteam CU Steambath Generator can be used for one or two steam rooms.
Each room requires one F1 Plus Kit sized for the room.
F1 Plus Kit consists of:
• F1 Plus Control and Sensor
• CU-HL Room High Temperature Limit Control
• One or more Steam Solenoid Valves
• Acrylic Shield, one for each steamhead
MrSteam CU Series Installation, Operating & Maintenance Manual
F1 Plus Kit Contents
13
100F
102
104
106
108 110 112
114
116
118
120
F1 Plus Control (Front) F1 Plus Sensor CU-HL Hi Limit Control Acrylic Shield
F1 Plus Control (Back) Steam Solenoid Valve F1 Plus Sensor Cover Steam Head
CU-HL Sensor Cover

MrSteam CU Series Installation, Operating & Maintenance Manual
14
F1 Plus Control Installation
WHT F1 PLUS WHTBRNBLK
ROOM TIMER STEAM SOLENOID
VALVE
WHT
F1 PLUS
WHTBRNBLK
ROOM TIMER STEAM SOLENOID
VALVE
Terminal
Block
F1 Plus Control
Blank
Single Control Installation
WHT F1 PLUS WHTBRNBLK
ROOM TIMER STEAM SOLENOID
VALVE
WHT F1 PLUS WHTBRNBLK
ROOM TIMER STEAM SOLENOID
VALVE
Double Control Installation
Hazard of Electric Shock. Disconnect all power supplies before making wiring connections.
NOTE: Reference applicable wiring diagram.
1. Remove 4" diameter blank cover located steam generator. Mount the F1 Plus faceplate on the back of the generator
cabinet with provided screws and nuts. For one room installation use the upper blank.
2. Connect the control wires to the bottom of the terminal above the control. The terminals are coded with the wire
insulation color:White-Blank-Brown-skip-skip-White.
3. Refer to applicable schematic for proper wire connections.
Control Panel Showing Control Panel Showing
One F1 Plus Control Two F1 Plus Controls
!
WARNING

MrSteam CU Series Installation, Operating & Maintenance Manual
15
Sensor Cable
Silicone Sealant
(4) Mounting Screws
Bulb Guard
Sensor
Locate approximately
5 feet above
steam room floor
F1 Plus Operating Temperature Sensor Installation
• Locate sensor on a wall inside the steam room five (5) feet above the floor.
• Route sensor cable directly to F1 Plus Control.
• Do not splice the sensor cable.
• Do not route sensor cable inside conduit.
• Do not route sensor cable with power wiring, next to electric motors or any other location subject to electrical noise.
• Seal cable entrance to steam room with silicone.
• Protect sensor with bulb guard provided.
F1 Plus High Limit Operating Temperature Sensor Installation
Sensor Cable
3/8" hole
Silicone Sealant
(4) Mounting Screws
Bulb Guard
Sensor
Route Sensor Cable
directly to F1 Plus Control
Locate approximately
5 feet above
steam room floor

MrSteam CU Series Installation, Operating & Maintenance Manual
16
CU-HL Installation
NOTE: Reference applicable wiring diagram.
1.
Model CU-HL room temperature control unit must be installed outside the steam room. Consider the length of
capillary (20 ft) before mounting.
2 .Sensing bulb must be installed inside the steam room five (5) feet above the floor on a wall. It is recommended that
it not be located directly by above the steamhead.
3. Remove screw above the dial and remove cover.
4. Mount housing using mounting holes at the back of the control. Locate CU-HL where it is accessible to authorized
personnel only it is not to be accessible to the general public.
To Avoid Electric Shock. Do not install control unit inside steam room
or in any wet or damp location.
5.
Install sensing bulb INSIDE steam room five (5) feet above the floor on a wall. Avoid sharp bends or kinks in
capillary tubing. This could affect the controller’s performance and may result in unsafe operation. Excess capillary
should be very carefully coiled and placed beneath the control unit.
6 .Secure sensing bulb to the wall with the sensor bulb guard provided.
Hazard of Electric Shock. Disconnect all power supplies before
making wiring connections.
7.
Connect wiring to CU steambath generator. See applicable wiring diagram. Remove jumper next to 120v control
supply input of CU generator. Using AWG #14 or larger wire, connect terminals R and B of controller to the
terminals vacated by the jumper. Also connect ground wire from controller ground terminal to CU ground
terminal. Note: All factory ground wiring is color coded using green/yellow insulation:
8. Set differential dial to maximum,“12”.
9. Reassemble cover and screw.
10. Set the thermostat knob of Model CU-HL to max 130°F or at the maximum temperature permitted by
jurisdiction.
!
WARNING
!
WARNING

CU 81500 Kit for Soft Water Installations
• F1 Plus Control Panel
• Motorized Drain Valve Assembly #CU-81500
CU 81600 Kit for Hard Water Installations
• F1 Plus Control Panel
• Motorized Drain Valve Assembly #CU-81600
Front Back
CU-81600
Motorized Drain Valve
Front Back
CU-81500
Motorized Drain Valve
MrSteam CU Series Installation, Operating & Maintenance Manual
17
Automatic Blowdown System Kit Contents

MrSteam CU Series Installation, Operating & Maintenance Manual
18
Hazard of Electric Shock. Disconnect all power supplies before
making wiring connections.
Note: Reference applicable wiring diagram.
1.
Remove blank cover and mount the Automatic Blowdown Control Panel on the front of the generator cabinet
with screws and nuts provided.
2. Remove the jumper between Brown and Black from the terminal block above the panel.
3. Connect the wires to the terminal block.
The terminals are coded with the wire insulation color: Brown-Black-White-Green.
4. Plumb the motorized valve assembly to the generator drain valve.
5. Install the valve cable in the knockout below the Automatic Blowdown Control Panel.
6. Connect the wires to the terminal block at the bottom of the panel.
The terminals are coded with the wire insulation color.
CU81500:White-Blue-none-Green. CU81600:White-Blue-Red-Green
7. Program the timer and set the clock (See page 25)
Automatic Blowdown System Kit Installation
!
WARNING
CU AUTOFLUSH
GRNWHTBRNBLK
CU-81500
Motorized Drain Valve
CU AUTOFLUSH
GRNWHTBRNBLK
CU-81600
Motorized Drain
Valve Assmbly
F1 Plus
Control Panel
Terminal Block
in Steam Generator
Panel Interior

MrSteam CU Series Installation, Operating & Maintenance Manual
Auxiliary Manual Reset Low Water Cutoff
19
Hazard of Electric Shock. Disconnect all power supplies before making
wiring connections.
NOTE: Reference applicable wiring diagram.
1.
Install the auxiliary low water cutoff pc board below the AUX LWCO terminal block inside the control panel
using screws provided.
2. Remove jumper between Yellow and Yellow from terminal block.
3. Connect the pc board wires to the terminal block. The terminals are coded with the wire insulation color:
Green-Yellow-Yellow-Black-White-none.
4. Install manual reset button and connect wires to RESET terminals on pc board.
5. Locate and punch out knockout on middle and back of generator.
6. Remove 3/8” npt plug and install side probe.
7. Install electrical junction box over the probe, connect probe wire and close junction box.
8. Install other end of the probe cable in the knockout adjacent to Aux Lwco pc board.
9. Connect probe wire to LLCO terminal on Aux Lwco pc board.
!
WARNING

MrSteam CU Series Installation, Operating & Maintenance Manual
20
MR STEAM CU Steambath Generators require two sources of electrical supply – power voltage and control voltage. Power
voltage is usually 208, 240, or 480 volt, single or three phase. Control voltage for generator suitable for operation with
these voltages is 120V, 1PH.
IMPORTANT: See the generator nameplate for specific electrical supply requirements for your steam generator. A light-
ed ON/OFF switch activates the control circuit. MR STEAM CU Generators are equipped with automatic liquid level/low
water cut-off control. CU360 – CU1400 are equipped with a dual probe type electronic control. CU2000-CU4500 are
equipped with float type MM150 control (Refer to wiring diagrams.) When there is no water in the generator, the contac-
tor is "OFF" and the water feed solenoid valve is "ON". The unit will start filling with water.When the water level has
reached approximately halfway up the gauge glass, the contactor(s) will be energized and, in turn, energize the heating ele-
ment(s).The water solenoid will continue to feed water for a short time and then de-energize. Steam will be available with-
in a few minutes.
The generator has an electronic high water level cut-off control. If water level rises near the top of the pressure vessel, the
contactor(s) and the water feed solenoid valve will de-energize to “OFF”.
When steam pressure reaches the operating pressure control setting, the pressure control will de-energize the
contactor(s). Operating pressure control is factory set at 5 psig.
IMPORTANT: It is recommended that the steam generator not be operated higher than 5 PSIG.
Steam supply to the steambath is controlled by the F1 Plus Temperature Control System and the steam solenoid valve(s).
As the room temperature selected by the owner/operator decreases below the set point, the F1 Plus Control will energize
the steam solenoid valve(s) and allow steam to enter the steam room. Once the set temperature on the control is reached
at the sensor, the control will de-energize the steam valve, closing the valve and stopping the flow of steam into the steam
room.
The F1 Plus Kit is provided with CU-HL High Limit Room Temperature Controller. CU-HL monitors the room tempera-
ture inside the commercial steambath. If the room temperature exceeds the set point, Model CU-HL shuts off the power
to the CU Steambath Generator, shutting steam off. CU-HL can also send a signal to an audible alarm (provided by oth-
ers).
The pressure in the generator will decrease slightly as steam leaves the generator and enters the steam room.The pressure
control will energize and de-energize the contactor(s), maintaining the set pressure. As the water level in the generator
decreases, the liquid level control will energize the water solenoid valve on and off and maintain proper water level.
IMPORTANT: Owners/operators should obtain a copy and familiarize themselves with the latest edition of the American
College Sports Medicine Health/Fitness Faculty Standards and Guidelines, or a similar resource and reference publication,
and refer to those guidelines for the proper and safe operation of a spa facility including steamrooms.
The owner/operator has the responsibility to select a room operating temperature meeting guideline requirements for
steamrooms.
Important Optional Equipment
1. Optional Automatic Blowdown Systems (CU81500, CU81600) have a 24-hour, 7-day timer that turns the steambath
generator ON and OFF. At the end of the "ON" cycle, the boiler is automatically blown down, discharging daily accumula-
tion of minerals and salts which if not drained may affect steam generator performance and operation.
IMPORTANT NOTES:
a. Automatic Blowdown System CU 81500 is intended for installation with soft water conditions.
b. Automatic Blowdown System CU 81600 is intended for installations with hard water conditions and/or usage
exceeding 8 hours per day.
2. An optional control circuit transformer provides control circuit voltage from the power supply voltage.
This option is in lieu of the need for a separate control circuit.
3. An optional Auxiliary Manual Reset Low Water Cutoff serves as a back up to the standard liquid level control as
required in some jurisdictions.
Principles of Operation