Siemens RAB20 Series User Manual

Technical Instructions RAB20 Series Two-pipe Fan Coil Room Thermostat
Document Number 155-526P25
March 2, 2007
Page 8 Siemens Building Technologies, Inc.
Maintenance
The room thermostat is completely maintenance-free. If inoperable, replace entire unit.
WARNING:
High voltage. Disconnect power before servicing. Metal part is not
grounded.
Diagrams
N
L
M1
AS
N1
G3
TH0508R3
Y
I II III
G2G1
L
ZV
W
AS Aqua sensor (by others)
G1 Control output fan speed I
(Low)
G2 Control output fan speed II
(Medium)
G3 Control output fan speed III
(High)
L Operating voltage
M1 3-speed fan
N Neutral
N1 Room thermostat
W Valve output, heating
Y Valve output, cooling
ZV Zone valve
Figure 5. Wiring.
W
T[˚F]
ON
OFF
SP
SD
TH0488R3
Heating Mode
Y
T[˚F]
ON
OFF
SP
SD
TH0489R2
Cooling Mode
SD Switching differential
SP Room temperature
setpoint
T Room temperature
W Valve output signal
heating
Y Valve output signal
cooling
Figure 6. Operating.

Siemens RAB20 Series Specifications

General

Brand	Siemens
Model	RAB20 Series
Category	Thermostat
Language	English