mr. steam CU-360 Instruction manual

1
mr
.steam
®
Feel Good Inc.
CU Series Steambath Generators
Installation, Operation & Maintenance Manual Models: CU-360 through CU-4500
Installation, Operation & Maintenance Manual
_______________________________________
IMPORTANT LEAVE THISMANUAL
WITH THE OWNER/OPERATOR
_______________________________________

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.steam®
C U S E R I E S Installation, Operating & Maintenance Manual
2
PUR 100376 REV 12.16
TABLE OF CONTENTS
BeforeInstalling .................................3
SteamRoomGuidelines ...........................3
Locating the Steam Generator Unit . . . . . . . . . . . . . . . . . .4
Selecting the Steam Generator . . . . . . . . . . . . . . . . . . . . .5
Dimensional & Clearance Specifications . . . . . . . . . . . . .6-9
Installation: Plumbing, Water Supply, Steam Line,
Drain,SafetyValve .............................10
Water Quality Information . . . . . . . . . . . . . . . . . . . . . . . . .10
SteamRoomGuidelines ..........................11
Steamhead & Acrylic Shield . . . . . . . . . . . . . . . . . . . . . . .11
Electric&Wiring ................................12
WiringDiagrams .............................13-16
Digital1Control: ...............................17
ControlInstallation ............................18
Temperature Sensor Installation . . . . . . . . . . . . . . . . . .18
PrinciplesofOperation ...........................19
Automatic Blowdown System . . . . . . . . . . . . . . . . . . . . . .20
Operating and Testing
Auto Blowdown, Digital 1 Control, CU-HL ............21-22
30-MinuteTimer ................................22
WarningSignage ...............................23
Pre-OperationCheck.............................23
Pressure Controls Operation & Testing . . . . . . . . . . . . . . .23
TorquesValves ..................................23
Operation .....................................24
Manual & Automatic Blowdown Instructions . . . . . . . . . .24
Maintenance Instructions . . . . . . . . . . . . . . . . . . . . . . . . . .25
Water Gauge & Gauge Glass: Installation . . . . . . . . . . . . .26
Water Gauge & Gauge Glass: Use and Care . . . . . . . . . .27
24-hour and 7-day Time Switches . . . . . . . . . . . . . . . . . . .27
TroubleShooting .............................28-30
Check:
PC Boards, Probes, Steam Solenoid Valve,
Digital 1 Control, Heating Element . . . . . . . . . . . . . . . .31
Element Replacement Instructions . . . . . . . . . . . . . . . . . .32
Typical Component Arrangement
CU360–CU1400 .............................33
CU2000–CU4500 .............................33
Auxiliary Manual Reset Low Water Cutoff . . . . . . . . . . . . .33
Replacement Parts List . . . . . . . . . . . . . . . . . . . . . . . .34-35
Warranty.......................................35
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 generator. These are types of potential hazards that
may occur during this installation and operation:
signals a situation where minor 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.
mr
.
steam
®Sussman-Automatic Corporation®[email protected] www.mrsteam.com
43-20 34th Street, Long Island City, NY 11101 TEL: 1 800 76 STEAM FAX: [phone]
9410 S. La Cienega Blvd. Inglewood CA 90301 TEL: 1 800 72 STEAM FAX: [phone]
WARNING
!
CAUTION
!

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.steam®
C U S E R I E S Installation, Operating & Maintenance Manual
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BEFORE INSTALLING
IMPORTANT T
Ta ak ke e t ti im me e t to o r re ea ad d t th he e e e i in n t tr ru uc ct ti io on n t th ho or ro ou ug gh hl ly y b be ef fo or re e i in n t ta al ll li in ng g o or r e er rv vi ic ci in ng g. .
A
Al lt th ho ou ug gh h t th hi i C CU U S St te ea am mb ba at th h G Ge en ne er ra at to or r h ha a b be ee en n q qu ua al li if fi ie ed d f fo or r h hi ip pm me en nt t b by y M Mr r. . S St te ea am m, , t th he e
f
fo ol ll lo ow wi in ng g m mu u t t b be e r re ev vi ie ew we ed d f fo or r p pr ro op pe er r a an nd d a af fe e u u e e. .
IMPORTANT C
CU U G Ge en ne er ra at to or r a ar re e d de e i ig gn ne ed d f fo or r c co om mm me er rc ci ia al l a ap pp pl li ic ca at ti io on n t th ha at t r re eq qu ui ir re e c co on nt ti in nu uo ou u
o
or r n ne ea ar r c co on nt ti in nu uo ou u u u e e. . C CU U G Ge en ne er ra at to or r a ar re e n no ot t u ui it ta ab bl le e f fo or r i in n t ta al ll la at ti io on n w wi it th h i in nt te er rm mi it tt te en nt t o op pe er ra at ti io on n
w
we er re e t th he e g ge en ne er ra at to or r r re em ma ai in n u un nu u e ed d f fo or r e ex xt te en nd de ed d p pe er ri io od d o of f t ti im me e. . C Co on n u ul lt t M Mr rS St te ea am m b be ef fo or re e p pe ec ci if fy yi in ng g
a
a t te ea am m g ge en ne er ra at to or r t to o d de et te er rm mi in ne e t th he e o op pt ti im ma al l t te ea am m g ge en ne er ra at to or r f fo or r y yo ou ur r a ap pp pl li ic ca at ti io on n
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 Mr. Steam sizing guide. See page 6.
4. DO NOT use black iron pipe or galvanized pipe for the
steam line. Use brass pipe or copper tubing ONLY, and
in accordance 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 all
be considered before selecting a location for the
generator. See page 4.
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 DOCU-
MENT MUST BE SECURED IN A SAFE LOCATION.
7. Do not use or install unauthorized components, acces-
sories or products on the generator or generator piping.
IMPORTANT The Mr. Steam Digital 1 System operating
and over temperature control is to be installed in accor-
dance with the specific instructions provided. See Note 7
below.
DO NOT alter or modify any Mr.Steam
product. Doing so may result in an inoperable or hazardous
installation and will void the waranty.
STEAM ROOM GUIDELINES
IMPORTANT The following general information should be
used in conjunction with your architect, designer and contrac-
tor 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 steam rooms.
Steam room 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 fixtures approved for the applica-
tion should be used.
3. If tile or other smooth surface is used for
the flooring, 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 steam room enclosure, see page 8, “Steamhead”
and “Acrylic Shield” for important additional details.
5. Provide floor drains for condensate run-off and steam room
cleaning.
6. Comply with all applicable National and local building
and electrical Codes and confer with design consultants and
contractors for room construction details.
7. The Digital 1 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 location within the steam room. Connection of the
Digital 1 Over Temperature cut-off 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 discretion of the owner/operator.
CAUTION
!
CAUTION
!
WARNING
!

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.steam
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C U S E R I E S Installation, Operating & Maintenance Manual
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7. Provide access to the steambath generator for servicing.
See page 5 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 as required
to prevent incidental contact with the steamhead or direct
steam emission.
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.
LOCATING THE STEAM GENERATOR UNIT
(1-4):
1. Mr.Steam®CU commercial steambath generators are
designed to NEMA Type 1 requirements and are intended for
indoor u e only. They are to be located indoor in a dry, clean
location and are not to be ubjected to moi ture, conden-
ate, ho e wa h down or the like.
2. Do NOT install steambath generator outdoors or wherever
environmental conditions may effect the safety and/or per-
formance 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 thin-
ners, or the like. Installation in areas having high concentra-
tions 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 pg. 5-6. See page 6 for guid-
ance if generator is more than 25 feet from steam room.
6. Install steambath generator on a solid and level surface, and
mechanically secure generator in place.
WARNING
!
CAUTION
!
UTILITY ROOM
3⁄4" Steam
Solenoid
3⁄4" Steamhead
with Acrylic Shield
Steam
Generator
Fully
Insulated
Steam Pipe Digital 1
Sensor
1" Steam
Outlet
S T E A M R O O M
e
NOTE FOR ILLUSTRATIVE PURPOSES ONLY. Optional equipment shown.Consult with qualified designer,
architect or contractor for steam room construction details, including location of steam head(s) and sensors.
FOR ILLUSTRATIVE PURPOSES ONLY
MR. STEAM INSTALLATION
Figure 1

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mr
.steam
®
C U S E R I E S Installation, Operating & Maintenance Manual
SELECT A MR. STEAM 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 Mr. Steam 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.
Increase volume if the piping runs longer than 25 feet from the
generator to steam room.
B. IMPORTANT The 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.
Model Max Room Water Inlet Generator Outlet Dimensions (inches) Shipping
No. KW Volume* (cu ft) Size NPT Size, NPT WL H Wt. (lbs.)
CU-360 9 400 1/4" 1" 20 30 38 250
CU-500 12 500 1/4" 1" 20 30 38 250
CU-750 18 750 1/4" 1" 20 30 38 250
CU-1000 24 1000 1/4" 1" 20 30 38 270
CU-1250 30 1250 1/4" 1" 20 30 38 290
CU-1400 36 1400 1/4" 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 1/2" 1-1/2" 28 34 59 625
C. IMPORTANT When specifying a CU Commercial Steambath
generator the following is strongly recommended 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) steam rooms 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 Digital 1
temperature control system inclusive of the room operating
temperature control and the high-limit temperature control.
4. In any case, the purchaser and/or owner/
operator must consult with a designer,
architect, and/or consultant to assure the
proper specification of the steam generator.
*After taking into consideration all factors affecting resultant steam room volume including length,
width & height of steam room and distance to generator, select proper Model CU generator.
Consult with an architect, engineer, designer and/or contractor before making final selection.

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.steam
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C U S E R I E S Installation, Operating & Maintenance Manual
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DIMENSIONS
NOTES FOR FIGURE 2-4
Typical Arrangement of Boiler with
McDonnell Miller. For illustration
purposes only. Refer to all notes
below
1. All dimensions are approximate.
2. MM150 Liquid Level Control on
CU-2000 and larger models
only. CU-360 to CU-1400 have
electronic liquid level
controls.
15.7
15.7
22.0
6.6
9.4
13.5
25.0
16.4
12.6
1.9
37.2
Front Right Side
6.6
Front Right Side
16.6
30.1
26.4
23.9
33.0
20.5
17.1
5.6
27.5
16.3
2.8
39.3
19.0
0.8
Figure 2 CU360-1400
Figure 3 CU2000

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.steam
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C U S E R I E S Installation, Operating & Maintenance Manual
Front Right Side
31.3
28.3
18.1
34.2
18.7
16.0
30.6
10.3
4.3
2.5
17.2
51.5
25.8
DIMENSIONS (cont.)
Figure 4 CU4500

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.steam
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C U S E R I E S Installation, Operating & Maintenance Manual
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CLEARANCE SPECIFICATIONS
NOTES FOR FIGURE 5-7
Typical Arrangement of Boiler with
McDonnell Miller.
For illustration purposes only.
Refer to all notes below
1. MM150 Liquid Level Control on CU-2000
and larger models only. CU-360 to CU-
1400 have electronic liquid level controls.
2. IMPORTANT: Minimum Clearance from
Combustible Surfaces
1" above top of CU generator
Front of CU generator suitable for alcove
installation only.
1" from left side of CU generator.
16" from right side of CU generator.
Type of flooring: “C", suitable for com-
bustible flooring.
1" from rear of CU generator.
3. For ease of servicing, Mr. Steam
recommends a minimum of 36 inches of
clearance all around the CU generator.
1
MIN
36 MIN*
58 (TYP)
180
MAX
56
(TYP)
30
MIN*
Panel
Clearance
Service Area
Clearance
Service Area
Clearance
36
MIN*
9
1 MIN**
36 MIN*
85 (TYP)
180
MAX
56
(TYP)
30
MIN*
15
Panel
Clearance
Service Area
Clearance
Service Area
Clearance
36
MIN*
16 MIN*
Figure 5 CU360-1400
Figure 6 CU2000
& CU3000

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.steam
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C U S E R I E S Installation, Operating & Maintenance Manual
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1 MIN*
16 MIN*
1
MIN**
36 MIN*
87
180
MAX
103
36 MIN*
13
Panel
Clearance
Service Area
Clearance
Service Area
Clearance
Service Area
Clearance
36
MIN*
*Access to service areas to be supplied by customer.
Access door must not be less than 24” wide x 78” high.
Refer to NEC 110.26 for details
**1” Minimum distance from combustible materials all
around except as noted.
CLEARANCE SPECIFICATIONS (cont.)
Figure 7 CU4500

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.steam
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C U S E R I E S Installation, Operating & Maintenance Manual
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Steam Line
1. The steam solenoid valve should be plumbed as close as
practical to the steam room using only brass pipe or copper
tubing but must remain accessible for service or replacement.
The steam solenoid must be plumbed horizontally.
2. Pitch the steam line a minimum of 1/4”per linear foot of run,
towards the steam outlet on the generator, avoid valleys and
trapping of condensate.
3. Fully insulate steam lines with suitably rated high temperature
insulation.
5. Provide unions as required to facilitate installation and
disconnection of piping.
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.
INSTALLATION
P
Pl lu um mb bi in ng g
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 steam-bath
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. Provide unions as required to facilitate installa-
tion and disconnection of piping.
8. Recheck all factory and field plumbing connec-
tions for tightness.
WATER QUALITY INFORMATION
For optimum results, the feedwater supply should
be tested prior to initial startup. If the mineral con-
tent exceeds the following recommended limits,
various external treatment processes may be used
to correct the problem.
NOTE An analysis of the on-site boiler feedwater
must be made by a recognized and reliable water
treatment company to ascertain the existing condi-
tion and treatment required.
Recommended Feedwater Quality
Hardness, ppm 8 – 85 (~0.5 – 5 gpg)
P-Alkalinity, ppm 85 – 410 (~5 – 24 gpg)
T. Alkalinity, ppm 200 – 500 (~7 – 0 gpg)
pH (strength of alkalinity) 8.0 – 11.4
Blowdown boiler at least a once a day. If boiler
water or feed-water are outside the above limits, a
more frequent blowdown is required.
Recommended Limits Within a Boiler
Total Dissolved Solids, ppm 3500 Sulfite (SO3), ppm 25 – 50
Total Alkalinity, ppm 850 Phosphate, ppm 30 – 60
Suspended solids, ppm 300 P-Alkalinity as CaCO3, ppm 900
Silica (SiO2), ppm 125 Iron, ppm 2
Water quality can affect efficiency or result in boiler damage if neg-
lected. Boiler feedwater contains impurities in solution and suspen-
sion. These impurities concentrate in the boiler. The concentration
of these impurities increases as more feedwater is introduced into
the boiler and steam is produced. If the suspended solids are
allowed to concentrate beyond certain limits, a deposit or “scale”
will form on the boiler internal surfaces. This deposit can interfere
with the proper boiler operation and cause boiler failure.
The concentration of these impurities is generally controlled by the
feedwater quality and by blowdown. Blowdown refers to removing
a portion of the boiler water with high solids concentration and
replacing it with makeup water of a lower concentration.
WARNING
!
PI P E S I Z E G U ID E
Steam Outlet: 1" or 11⁄2
Steam Solenoid Valve: 3⁄4"
Steam Head: 3⁄4"
Drain Outlet: 1"

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.steam
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C U S E R I E S Installation, Operating & Maintenance Manual
11
STEAM ROOM GUIDELINES
IMPORTANT The following general information should be used in conjunction with your architect,
designer and contractor 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 edi-
tion of the American College of Sports Medicine Health/Fitness Faculty Standards and Guidelines
(ISBN: 0736051538), or a similar resource and reference publication, and refer to those guidelines for
the proper and safe operation of a spa facility including steam rooms.
STEAMHEAD (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 Mr.Steam PN CU-103985 acrylic shield on
each steamhead.
IMPORTANT For Steam rooms using acrylic, fiberglass or
other non-heat resistant materials used for steam room
enclosure, install each steam head 20-30 inches above the
floor.
2. Locate each steamhead away from bather seating area
and away from traffic patterns as required to prevent
incidental contact with steamhead or direct steam emis-
sions.
3. Install each steamhead with steam slots facing to the left
and right as shown in the diagrams.
4. NOTE To preserve the steamhead finish, do not use
wrench or other tools to tighten. Use of proper thread
sealant and hand tightening is usually sufficient.
5. Apply a bead of silicone around the steamhead where it
meets the wall as required to prevent moisture damage.
ACRYLIC SHIELD
Apply a small bead of silicone in the grooves on the top
and bottom of the steamhead. Place an Acrylic Shield (PN
103985) over the steamhead until the tabs engage the
grooves in the steamhead.
IMPORTANT Do not use with fragrance containing
aldehydes. Acrylic Shield damage may result. Mr. Steam oils
are approved for use with this acrylic shield.
Fully Assembled
Assembly
Steam Head
Steam Pipe
Acrylic Sheild
Use Teflon or equal
sealant on pipe threads
Steam
Supply Pipe
Fill gap with silicone or
equal sealant as required
for moisture seal
Diagram A
Steam Head
3/4”
Finished interior face
of steam room wall
Diagram B

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.steam
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C U S E R I E S Installation, Operating & Maintenance Manual
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ELECTRIC
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 conduc-
tor 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 electrical connec-
tions including all factory connections at the terminal block,
fuse block, top and bottom of contactor and element pins
prior to energizing generator (torque values are listed on indi-
vidual components, control circuit terminal strips should be
torqued to 20 in-lbs.).
AMPERAGE CHART Indicates Total Ampere Draw of Specific
CU Model at Voltage & Phase Specified
208V 208V 240V 240V 480V 600V
Model No. kW 1 PH 3 PH 1 PH 3 PH 3 PH 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 com-
binations 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.
WARNING
!
WIRING
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 9.
2. The unit is wired and pre-tested before ship-
ment. 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 electri-
cal 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 pg. 9, Item 5.
Substitution of components or
modification of wiring systems voids warranty
and can lead to dangerous operating condi-
tions.
4. The Digital 1 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 steam solenoid valve(s) shall be located
outside the steam room and shall be wired to
the Digital 1 controller(s) in accordance with
wiring diagram provided. See applicable wiring
diagrams included as part of this manual.
Ensure all splices in the sensor
cable are securely crimped soldered and sealed
with heat shrink tubing.
WARNING
!
CAUTION
!
CAUTION
!
CAUTION
!

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American College of Sports Medicine Health/Fitness
Faculty Standards and Guidelines, or a similar resource
and reference publication, and refer to those guide lines
for the proper and safe operation of a spa facility includ-
ing steam rooms. Steam room construction information is
avail-able from the Tile Council of America, Inc. at (864)
646-8453 or www.tileusa.com.
The Digital 1®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 location within the steam room. Connection of
the Over Temperature portion of the Digital 1 control is
mandatory to provide additional protection to the
bathers. The steam room is to be operated in accor-
dance with “Important” information as noted above.
IMPORTANT
Final selection of the steam room temperature setting is
at the discretion of the owner/operator.
Ensure all splices in the sensor cable are
securely crimped soldered and sealed with heat
shrink tubing.
CONTROL CIRCUIT WIRING DIAGRAM
SEE PAGES 11, 12 & 13 FOR DIAGRAMS
Installer shall use a safety switch of ade-
quate 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 electrical codes.
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 Digital 1®and solenoid valves.
IMPORTANT
3. Digital 1®sensors are intended to be field installed
within the steam room at the location selected by the
designer/architect. DO NOT LOCATE THE Digital 1
SENSOR NEAR OR ABOVE THE STEAMHEAD(S) AS
THIS MAY CAUSE DIRECT STEAM EMISSION TO
INTERFERE WITH STEAMROOM TEMPERATURE REG-
ULATION.
4. Autoflush System 24 hr. timer and Digital 1®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
3PH Power Supply
Power Contactor
Heating Ele ent
Diagra #1
Units with 1 Contactor (see note 1)
3PH Power Supply
Power Ter inal Block
Power Contactors
Heating Ele ents
Diagra #2
Units with 2 or ore Contactors (see note 1)
GRD
GRD
__ __ __ __ Field Wiring
__________ Factory Wiring
IMPORTANT Also refer to Control Circuit diagrams in this manual.
TYPICAL POWER WIRING DIAGRAM
WARNING
!
WARNING
!
CAUTION
!

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HIGH PROBE (WF/LWCO)
NOTES
1. Larger rooms may require two or more steam solenoid valves in parallel.
2. When generator services two rooms, second room requires a Digital 1 and Solenoid Valve(s).
CONTROL CIRCUIT WIRING DIAGRAM
Digital 1®Temperature Control System and optional automatic blowdown assembly
For Models: CU-360A to CU-750A and CU-1000AF3, CU-1250AF3, CU-1400AF3

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CONTROL CIRCUIT WIRING DIAGRAM
Digital 1 Temperature Control System and optional automatic blowdown assembly
For Models: CU-1000AB3, CU-1000AC3, CU-1250AB3, CU-1250AC3, CU-1400AB3, CU-1400AC3
NOTES
1. Larger rooms may require two or more steam solenoid valves in parallel.
2. When generator services two rooms, second room requires a Digital 1 and Solenoid Valve(s).

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CONTROL CIRCUIT WIRING DIAGRAM
Models CU-2000 and higher with Digital 1®Temperature Control System
and Optional Automatic Blowdown Assembly
IMPORTANT
1. Digital 1®sensors are intended to be field installed within the
steam room at the location selected by the designer/architect.
DO NOT LOCATE THE Digital 1 SENSORS NEAR OR ABOVE THE STEAMHEAD(S) AS THIS MAY CAUSE
DIRECT STEAM EMISSION TO INTERFERE WITH STEAMROOM TEMPERATURE REGULATION.
2. Autoflush System 24 hr. timer and Digital 1 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 instruction manual.
REMOVE JUMPER
FOR 2nd OVER TEMP.
SHUT OFF
HIGH
PROBE
(PNK)

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Digital 1 Sensor
Digital 1 Control and 30 ft. Cable Acrylic Shield
3⁄4"
Steam Solenoid Valve Digital1 Sensor Cover
3⁄4"
Steam Head
Digital 1 Sensor
Digital 1 Control and 30 ft. Cable Acrylic Shield
3⁄4"
Steam Solenoid Valve Digital1 Sensor Cover
3⁄4"
Steam Head
NOTE FOR ILLUSTRATIVE PURPOSES ONLY.
Optional equipment shown. Consult with qualified designer,
architect or contractor for steam room construction details,
including location of steam head(s) and sensors.
DIGITAL 1®KIT
Mr. Steam CU Steambath Generator can be used
for one or two steam rooms in accordance with
guidelines for generator selection on page 6. Each
room requires one Digital 1 Kit sized for the room.
See page 4 (figure 1) for typical installation.
DIGITAL 1 KIT CONTENTS
• Digital 1 Control (factory installed on generator)
• Digital 1 Sensor
• One 3/4" Steam Solenoid Valve and 3/4" Steamhead
• Acrylic Shield
• Sensor Cover
CU2 - DIGITAL 1®KIT CONTENTS
CU 2000–4500 serving one room using two steam
solenoid valves and two steamheads.
CU2-D1 KIT CONSISTS OF:
• Digital 1 Control (factory installed on generator)
• Digital 1 Sensor
• Two 3/4" Steam Solenoid Valves and 3/4" Steamhead
• Two Acrylic Shields, one for each steamhead
• Sensor Cover
TYPICAL INSTALLATIONS
Double steam rooms, single steam head (2x CU1-D1)
Single steam room, single steam head (CU1-D1)
Single steam room, double steam head (CU2-D1)

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Sensor Cable
3/8" hole Silicone Sealant
(4) Mounting Screws
Bulb Guard
Route Sensor Cable directly
to Digital 1 Control
Locate approximately
5 feet above
steam room floor
Sensor
1/2"
DIAGRAM A
Digital One
Control
Terminal
Block
Room
Timer
Room
Timer
Steam
Solenoid
Value
Room
Timer Steam
Solenoid
Value
Steam
Solenoid
Value
Room
Timer Steam
Solenoid
Value
(Org Wires
Over Temp.
Shut Off)
Blank
DIGITAL 1®CONTROL INSTALLATION
NOTE If the steam generator came with a factory
installed Digital 1®control, skip to Sensor 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 on
steam generator. Mount the Digital 1 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 block above the control. The terminals
are coded with the wire insulation color: Black-
White-Black-Brown-
Open -White.
3. Refer to applicable schematic for proper wire
connections.
WARNING
!
Control Panel Showing Control Panel Showing
One Digital 1®Control Two Digital 1®Controls
DIGITAL 1® OPERATING TEMPERATURE SENSOR INSTALLATION
• Locate sensor on a wall inside the steam room five (5) feet above the floor.
DO NOT LOCATE THE DIGITAL 1 SENSORS NEAR OR ABOVE THE STEAMHEAD(S)
AS THIS MAY CAUSE DIRECT STEAM EMISSION TO INTERFERE WITH STEAMROOM
TEMPERATURE REGULATION.
• Route sensor cable directly to Digital 1 Control.
• 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.
Ensure all splices in the sensor cable
are securely crimped or soldered and
sealed with heat shrink tubing.
CAUTION
!

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PRINCIPLES OF OPERATION
MR.STEAM CU Steambath Generators require two sources of
electrical supply – power voltage and control voltage. Power volt-
age 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 In all cases, refer specifically to the boiler data
plate located on the outside of the boiler enclosure for rated
power and control voltages.
IMPORTANT See the generator nameplate for specific electri-
cal supply requirements for your steam generator. A lighted
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 contactor 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, ener-
gize the heating element(s). The water solenoid will continue to
feed water for a short time and then de-energize. Steam will be
available within a few minutes.
The generator has an electronic high water level cut-off control.
If water level rises near the top of the pressure-sure 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 contac-
tor(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 Digital 1
Temperature Control System and the steam solenoid valve(s). As
the room temperature selected by the owner/operator decreases
below the set point, the Digital 1 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 Digital 1 Kit is provided with Over Temperature Control.
Digital 1 monitors the room temperature inside the commer-
cial steambath. If the room temperature exceeds the set point,
the Digital 1 shuts off the power to the CU Steambath
Generator, shutting steam off. CU-HL can also send a signal to
an audible alarm (CU-Alarm sold separately).
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), main-
taining 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 of Sports Medicine Health/Fitness Faculty Standards
and Guidelines, or a similar resource and reference publica-
tion, and refer to those guidelines for the proper and safe
operation of a spa facility including steam rooms.
The owner/operator has the responsibility to select a room
operating temperature meeting guideline requirements for
steam rooms.
Important Optional Equipment
1. Optional Automatic Blowdown System (CU81600) has a 24-
hour, 7-day timer that turns the steambath generator ON
and OFF. At the beginning of the "ON" cycle, the boiler is
automatically blown down, discharging daily accumulation
of minerals and salts which if not drained may affect steam
generator performance and operation.
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.

CU AUTOFLUSH
GRNWHTBLKBRN
Blowdown
Control Panel
Terminal Block
in Steam Generator
Panel Interior
Remove Jumper
Snubber
(see note 4)
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AUTOMATIC BLOWDOWN SYSTEM CU 81600
The Automatic Blowdown System consists of the following factory installed items:
• Blowdown Control Panel
• Motorized Drain Valve Assembly #CU-81600
NOTE If the steam generator came with a factory installed Automatic
Blowdown System see page 24 on how to program the timer.
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 & 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. When using the Digital Blowdown timer (PN 103662) install the Snubber (PN 104251)
between the black and white terminals.
5. Plumb the motorized valve assembly to the generator drain valve.
6. Install the valve cable in the knockout below the Automatic Blowdown Control Panel.
7. Connect the wires to the terminal block at the bottom of the panel. The terminals are
coded with the wire insulation color. CU81600: White-Blue-Red-Green
8. Program the timer and set the clock (See page 24)
AUTOMATIC BLOWDOWN SYSTEM KIT INSTALLATION
CU-81600 Motorized
Drain Valve Assem
bly
WARNING
!