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PB112-024T 400-112-000-B 18/1/06 1/1
The PB112-024T power base can be used on any TH11x series
thermostat (with the exception of the TH110 model). This low-voltage
power base operates on 15-minute cycles and can be connected to a
line-voltage load using a relay or directly to a 24-volt device. The
PB112-024T is compatible with most relays; however, the following
Aube relays are optimized for use with this power base:
• RT850 solid-state relay (SSR)
• RT850T solid-state relay (SSR) with built-in 24-V transformer
• RC840 electromechanical relay
• RC840T electromechanical relay with built-in 24-V transformer
n One (1) power base
o Two (2) plastic anchors
p Two (2) mounting screws
For a new installation, choose a location about 1.5 m (5 ft.)
above the floor.
The thermostat must be installed on an inside wall facing the
heating system (except for floor heating systems).
Avoid locations where there are air drafts (top of staircase, air
outlet), dead air spots (behind a door), direct sunlight or
concealed chimney or stove pipes (except for floor heating
systems).
The installation must be carried out by an electrician and com-
ply with local electrical codes.
n Turn off power to the heating system at the main electrical panel
to avoid electrical shock.
o Wire the base according to your application. See typical wiring
diagrams in sections 4.1 to 4.4.
p For a floor heating system installation, con-
nect the floor sensor between the S and R ter-
minals.
q Secure the base to the wall using the provided
screws and wall anchors.
r Configure the switches located on the control module (if any).
Refer to the user guide.
s Install the control module onto the base.
t Apply power to the heating system.
u Verify the installation by checking that the heating system can be
turned on or off using the thermostat.
4.1 Single SSR with Built-in Transformer
4.2 Multiple SSRs with External Transformer
4.3 Electromechanical Relay with External Transformer
4.4 Hot Water Heater Valve
Maximum load: 0.5 A / 24 VAC
Heating cycle length: 15 minutes
Operating temperature: 32°F to 122°F (0°C to 50°C)
Storage: -4°F to 122°F (-20°C to 50°C)
Size (H•W•D): 124 x 70 x 23 mm (4.89 x 2.76 x 0.91 in)
Wire gauge: 14 to 22 AWG
n
Applications
1.
o
Supplied Parts
2.
p
Installation Guidelines
3.
q
Installation Procedure
4.
r
Technical Specifications
5.
Electrical
Panel
Heater
Blue
Red
Black
Electrical
Panel
Heater
Heater
External 24 V
Transformer
Red
Red
Black
Black
Electrical
Panel
Heater
External 24 V
Transformer
Electrical
Panel
Valve
External 24 V
Transformer
PB112-024T
Installation Instructions
24 V Low-Voltage Power Base