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Polygyr®-Compact
Discharge Air Temperature
Controller
•
Features
Two outputs for heating and cooling
•
Continuous control signal
Technical Instructions
Document No. CM1N3407E-P25
Rev. 1, February, 2000
Application
•
PI control
•
Electronic
•
24 Vac
The RCM61.22 is used for controlling discharge air temperature in smaller ventilating
and air conditioning installations (by heating and cooling).
Application examples:
•
Individual installations, (kitchens, cloak rooms, storage rooms, etc.)
•
Zone control in larger installations
The following units can be controlled:
•
Heating and cooling valve actuator
•
Air damper actuator
•
Step controller or current valve for electric air heater battery
•
Signal converter
The temperature controlled by the RCM61.22 can be shifted:
•
by the outdoor temperature to obtain summer/winter compensation.
•
by a building automation system to obtain set point adjustment (fixed value shift).
Product Number
Ordering
RCM61.22
When ordering, specify quantity, product number and description.
Siemens Building Technologies, Inc.
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Technical Instructions Polygyr-Compact Discharge Air Temperature Controller
Document Number CM1N3407E-P25
Rev. 1, February, 2000
Function
The RCM61.22 provides PI control. The proportional band can be adjusted. The
controller compares the actual value with the set point and generates a proportional
control signal when a deviation occurs. The control signal is continuous and has a range
of 0 - 10 Vdc. When the control signal changes from 0 – 10 Vdc, the correcting variable
changes from 0 - 100%, i.e., there is a proportional relationship between the correcting
variable and the control signal. The adjusted Xp (proportional band) refers to heating
(Y1). The P band for cooling (Y2)is half as wide, making it possible to obtain the same
control quality for both heating and cooling, although the control conditions are different
(nearly the same plant gain with different correcting spans).
Each control output generates a control signal of 0 – 10 Vdc. The outputs are switched
in sequence and their mode of operation is opposed making it possible to provide
sequence control of two actuators with different modes of operation.
SASC0016R1
Y
10V
QYLoad
Signal voltage
Heating
0
0
Q
Cooling
Compensation
Design Features
Figure 1.
The reference value is fed to the controller, which shifts the set point. There are two
possibilities:
•
Universal compensation over the whole setting range or over any part of the setting
range with the help of the RZF61.100 universal shift controller, or from a building
automation system.
•
Set point adjustment within ± 10% of the setting range; this is generally made from
a building automation system.
For more information on compensation, see
Application
.
The RCM61.22 is a small, electronic controller that combines electronics, setting scale
and sensing element into one unit.
The casing is plastic with a removable cover, fully active flexible sensing element, and
removable mounting flange with adjustable positions.
All setting devices and connecting terminals are contained in the housing and
accessible only when the cover is removed.
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Siemens Building Technologies, Inc.
Page 3
Polygyr-Compact Discharge Air Temperature Controller Technical Instructions
Document Number CM1N3407E-P25
Rev. 1, February, 2000
Design Features,
Continued
1 Connecting
terminals
2 Setting
potentiometer for
P band
3 Slider for setting
the desired value
4 Setting scale
5 Service plug
6 Mounting flange
7 Flexible sensing
element
Figure 2.
The scale and slider for setting the desired temperature can be seen through a window
in the cover. Knock-out holes (Pg11) provide entry for the cables.
After fitting the mounting flange to the duct wall, the controller can be installed in seven
different positions so that, with layers of insulation up to 2.76 inches, the controller
housing will not be insulated.
The detector can be bent and adapted to the shape of the duct. It senses the average
temperature in the duct because the measuring element (Ni wire) extends over the total
length of the flexible sensing element.
Unit Combinations
Remote Setting Units
Specifications
The RCM61.22 can control various units with the following characteristics:
•
Type of control 10 Vdc
•
Operating voltage 24 Vac
The FZA21.11 remote setting unit is used for remote setting of the desired value.
Operating voltage 24 Vac ± 20%
Frequency 50 – 60 Hz
Power consumption 1 VA
Control signal:
Voltage 0 – 10 Vdc, continuous
Current 1 mA
Integral action time 2 minutes
Measuring element LG-Ni 1000 Ω @ 32°F (0°C)
Time constant 30 seconds at 6.5 ft/s
Setting ranges
Set point 32 – 122°F (0 – 50°C)
Proportional band Xp 4 – 100 % 3.6 - 90°F
Permissible ambient temperature:
Operation 14 – 122°F (-10 – 50°C)
Transport and storage -13 – 149°F (-25 – 65°C)
Cable entry fitting Pg11
Connecting terminals for 2 x 14 AWG or 1 x 12 AWG
Weight 0.55 lb.
Siemens Building Technologies, Inc.
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Page 4
Technical Instructions Polygyr-Compact Discharge Air Temperature Controller
Document Number CM1N3407E-P25
Rev. 1, February, 2000
Application
Mounting
When the unit is switched off or the power supply interrupted (Terminal G), the
regulating unit is automatically run to the closed or no-load position.
A transformer is required to generate the operating voltage of 24 Vac. When several
units are connected, the size of the transformer is determined by adding up the power
consumption of the individual units. See
designations.
Every output of the RCM61.22 can control up to 10 units (actuators, converters, etc.) in
parallel operation. If a compensation input is used, attention must be paid to the input
signal.
Terminal Z1: Input for universal compensation. The signal + 5V ± 10V
corresponds to ± 100% of the theoretical setting range.
Terminal Z3: Input for set point adjustment (fixed value shift). The signal + 5V ±
5V corresponds to ± 10% of the theoretical setting range.
Mounting location:
•
After the supply air fan, if the latte is mounted after the last air handling unit.
•
Otherwise, after the air handling unit, with a clearanc e of at leas t 1.64 feet .
The flexible sensing element should be positioned diagonally in the duct, but must not
come in contact with the duct wall.
Wiring Diagrams
for connecting terminal
Commissioning
Installation Instructions are supplied with the unit.
The wiring must be checked when commissioning the installation. To facilitate
commissioning, the controller can be operated as a P controller by using a service plug.
The correct operation of the regulating unit can be checked by setting the slider to its
limit positions. The factory-set P band Xp normally gives good control results. If
readjustment is required, the following must be noted:
•
In case of instability: Xp must be increased.
•
In case of excess stability: Xp must be decreased.
If auxiliary control functions (e.g., limitation, compensation) are fed to the controller, the
controlled value must first be adjusted, with no influence from the auxiliary control
functions. To do this, the terminals for auxiliary units must be disconnected. The
auxiliary values are adjusted only after the controlled value is adjusted.
If a remote setting unit is used, the slider for setting the desired temperature must be set
to “ext”.
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Siemens Building Technologies, Inc.
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Polygyr-Compact Discharge Air Temperature Controller Technical Instructions
Document Number CM1N3407E-P25
Rev. 1, February, 2000
Wiring Diagrams
Terminal Layout
The following wiring diagrams only show the fundamental layout. They do not contain
the switch off functions and other switching functions which can vary from one
installation to another according to the operating conditions.
SP
RR1M
Z1 Z3 G
Y2
GYR
G0
Y1
M U
G0
N1
Y2
24V~
GYR
G0
SN
SASC0018R1
RM
Y1
M U
N1 RCM61.22 Discharge Air Temperature Controller
R1 FZA21.11 Remote Setting Unit
Y1 Actuator for ⊕ (heating)
Y2 Actuator for (cooling)
Figure 3. Exhaust Air Temperature Control with Low Limiting of Discharge Air
Temperature.
G, G0 Operating voltage 24 Vac
Z3Z1MRG
Y1G0 Y2
SASC0017R1
Figure 4. Terminal Layout.
M Measuring neutral
R Set point signal
Y1 Control signal 0 – 10 Vdc for ⊕ heating
Y2 Control signal 0 – 10 Vdc for cooling
G System potential (SP)
G0 System neutral (SN)
Z1 Reference signal + 5V ± 10V
Z3 Reference signal + 5V ± 5V
Dimensions
2.76 4.33
0.24
min. 1.57
max. 3.94
0.75
max. 0.39
16.73
min. 2.76
0.08
0.79
4.02
1.97
2.36
4.02
0.24
3.15
~0.91
SASC0008R1
2.13
Pg.11
1.02
1.02
Figure 5. Dimensions in Inches.
Information in this publication is based on current specifications. The company reserves the right to make changes in specifications and models as
design improvements are introduced. Polygyr is a trademark of Siemens Building Technologies, Inc. © 2000 Siemens Building Technologies, Inc.
Siemens Building Technologies, Inc.
Landis & Staefa Division
1000 Deerfield Parkway
Buffalo Grove, IL 60089-4513
U.S.A.
Document No. CM1N3407E-P25
Printed in the U.S.A.
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