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a
The five relays are wired via terminals W, Y, Gh, Gm, and Gl. Relay 1 controls Heat open (W) or Cool open (Y). Relay
2 controls Cool open or Electrical heater output (Y/A). Relays 3, 4, and 5 control the High, Medium, and Low fan
speeds respectively (Gh, Gm, and Gl).
NOTE: In 2-pipe configurations without Auxiliary Heat, only 4 relays are used; relay 2 (Y/A) is not used.
b
Pipe sensor is required for 2 pipe auto changeover and 2 pipe auxiliary heat applications.
5-13/16 (148)
3-13/16
(97)
THERMOSTAT
SUB-BASE
5/32
(4)
5/32
UP
(4)
Fig. 1. Dimensions in inches (mm).
INSTALLATION
When Installing this Product...
1. Read these instructions carefully. Failure to follow
them could damage the product or cause a hazard-
ous condition.
2. Check the ratings given in the instructions and on
the product to make sure the product is suitable for
your application.
3. Installer must be a trained and experienced service
technician.
WARNING
Risk of electrical shock.
Can cause severe injury, property damage or
death.
Disconnect power supply before installation and
before servicing.
IMPORTANT
The thermostats are line voltage powered devices. All
wiring must comply with national and local electrical
codes, ordinances and regulations. Provide disconnect
means and overload protection, as required.
The TB8575A1000 thermostat must be powered by an
Approved 24 Vac, Class 2, NEMA rated transformer
(such as a W6380 Relay Control Center).
Location
The thermostats are the temperature control element in a
fan coil or air-conditioning system. They must be located
about 1.5m (5 ft.) above the floor, in a position with good
air circulation, to sense room temperature.
1-3/16
(30)
3-1/4 (83)
1-3/4
(44)
2-3/8 (60)
TB6575/TB8575 DIGITAL FAN COIL THERMOSTATS
IMPORTANT
Do not mount the device where it can be affected by:
1-1/8
1. Drafts or dead spots behind doors or in corners.
(29)
2. Hot or cold air from ducts.
3. Radiant heat from the sun or appliances.
4. Unheated (uncooled) areas such as an outside
wall behind the thermostat.
5. Concealed pipes or chimneys.
Mounting and Wiring
CAUTION
Equipment damage hazard.
Operation at low temperatures can cause fan
coil damage.
This thermostat is not a safety device. Do not use
it where the space temperature is outside of the
device operating range.
A display of two dashes, – –, for the Room Temp
display indicates a sensor failure or a temperature
outside of the thermostat operating range of 18°C
M27589
to 49°C (0°F to 120°F). With – – displayed, the
thermostat ceases to operate. When the
temperature returns to within its operating limits,
the thermostat returns to operation.
The optional freeze protect feature should be used
if low temperatures can occur.
The thermostat must be mounted flush to the wall. The
thermostat can be mounted directly to a 2 x 4 in.
horizontal junction box (see Fig. 2 on page 4). An optional
adaptor plate (50033847-001) can be used with a 4 x 4 in.
or a vertical junction box for which mounting screws are
supplied (see Fig. 3 on page 4).
1. Prepare the supply wires:
a. Mounting on a 4 x 4 in. or vertical 2 x 4 in.
junction box:
(1) Feed the supply wires through the junction
(2) Affix the adaptor plate to the junction box
b. Mounting on a horizontal 2 x 4 in. junction box:
Feed the supply wires through the opening of the
junction box.
2. Attach the supply wires:
a. For the TB6575A1000 and TB6575B1000
models:
(1) Push the fly lead wires through the wiring
(2) Attach the fly lead wires to the supply wires
(3) Push the fly lead and supply wires back into
b. For the TB8575A1000 model (which does not
have pre-wired fly leads):
3
box and the opening in the adaptor plate.
using the screws provided.
access hole in the sub-base.
using wire nuts (not provided).See Table 3
on page 5 for terminal and lead identifica-
tion.
the junction box.
62-0311—05
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