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RCU50U and RCU50.2U Room Temperature Controllers
For VAV Systems
Mechanical Design,
Continued
DIP Switch No.
1
Operating mode changeover
2
Operating action of switch
for external operating mode
3
4
5
Cooling signal output in
DIP Switch
No.
1
Signal inversion 0 to 10 Vdc
1. Factory setting
Accessories
Notes
Siemens Building Technologies, Inc.
The screw terminals are mounted on the base. The DIP switches and the potentiometer
are located at the rear of the unit. To access the DIP switches, remove the controller
from the controller base. See Figure 7.
Table 3. RCU50U DIP Switches.
Meaning
via external switch
changeover
Standby
P-band
energy saving mode
Table 4. RCU50.2U DIP Switches.
Meaning
ARG70
Adapter Plate for 2 × 4-inch or 4 × 4-inch conduit boxes
QAH11.1
Changeover/remote sensor
• In systems without automatic changeover, the temperature sensor can be replaced
by an external switch for manual changeover.
• In systems with cooling only operation, the controller changeover input (terminals 2
and 3) must be bridged.
• In systems with heating only operation, do not connect sensor to, or bridge
controller changeover input (terminals 2 and 3).
Figure 7. Dip Switch Setting.
Position ON
Changeover between
normal operation and energy
saving mode
Changeover activated when
contact of switch is closed
1
(N.O.)
OFF
2°F (1°C) in heating mode
1°F (0.5 C) in cooling mode
Active
Position ON
Output signal 0 to 10 Vdc
Technical Instructions
Document Number 155-327P25
Rev. 1, March, 2002
Position OFF
Changeover between normal
operation, energy saving and
standby
Changeover activated when
contact of switch is open
(N.C.)
Frost protection mode (heating
output ON at a set point of 46°F
1
(8°C)
7°F (4°C) in heating mode
3.5°F (2°C) in cooling mode
Inactive
Position OFF
1
Output signal 10 to 0 Vdc
1
1
1
1
Page 5
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