mr
.
steam
®
C U S E R I E S Installation, Operating & Maintenance Manual
19
PRINCIPLES OF OPERATION
M
R.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.
D
igital 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.
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