protech PRO-615 Quick start guide

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MODEL PRO-615
Order Number 411016
7-Day Programmable Multi-Stage
Electronic Digital Thermostat
Installation Instructions
and Owner’s Manual

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Application
For use with low voltage, multi-stage, non- heat pump systems.
Specifications
•Compatible with systems having up to 2 stages of heating and cooling
•AC Operating voltage: 18-30V
•Temperature setting range: 45°F – 90°F (7.0°C – 32.0°C)
•Temperature measurement accuracy: +/- 1 deg. F. (+/- .5 deg. C)
•Terminations: R, C, G, W1, W2, Y1, Y2, O, and B rated at 1.0 Amp, 3 Amps total
load.

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Features
•Backlit display showing both set point and room temperature simultaneously
•Removable sub-base with wiring terminals for easy installation and setting
•Fahrenheit or Celsius operation
•Adjustable temperature differential
•Compressor short cycle protection
•High temperature safety switch protection
•Low battery warning
•Set point recovery mode
•Adjustable filter warning
•Electronic memory for user settings and programs
•Adjustable hold period
•Meets Energy Star and Title 24 Guidelines
•Residual Fan Delay

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Installation
IMPORTANT:
•Read all instructions carefully. Failure to do so may result in a hazardous
condition.
•This unit is designed for use with 24 volt Multi-stage conventional heating and
cooling systems. Check the operating voltage of your system, and do not use this
thermostat with systems exceeding 30 volts.
•All wiring must conform to local and national electrical codes.
•Always disconnect the power supply during installation to prevent shock or
equipment damage.
•This thermostat should only be installed and used as describedin this manual.
Any other use will void the warranty.

Removing an old thermostat
•Be certain all power to the heating or cooling system is disconnected.
•Remove the cover of the old unit, and identify each wire by placing a piece of tape
with the terminal designation marked on it before disconnecting the wires.
•Remove the existing thermostat from the wall while securing the wires to prevent
them from falling back into the wall.
Location
•Locate the thermostat 4 to 5 feet above the floor on an inside wall in accordance with
applicable codes.
•Locate the unit in an area with good air circulation, and of average temperature.
•Avoid areas affected by drafts, dead spots behind doors or in corners, exposure to
direct airflow from ducts, and exposure to significant radiant heat from sunlight,
lamps, or other appliances.
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Attaching the sub-base to the wall (See Fig. 1)
1. Be sure all power to the heating or cooling system is disconnected.
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2. Remove the thermostat from the box and packaging.
3. Carefully remove the sub-base from the unit by pressing the latch release under the
bottom of the front side of the unit.
4. Place the sub-base against the wall in the desired location while guiding the
control wires through center opening, and mark the mounting hole locations using the
sub-base slots as a template.
5. Remove the sub-base from the wall, and drill the mounting holes using a 3/16 in.
drill bit.
6. Mount the sub-base to the wall using the screws and anchors provided, while
guiding the wires through the wire opening.
7. Connect the wires securely to the terminal block using the appropriate terminal
designations, referring to the Wiring Diagram section of this manual. Important:
Be sure to follow instructions for jumper installation in diagrams.

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Mounting
Screws (2)
Wire Opening
Mounting Slots Mounting tabs
Anchors (2)
Fig. 1 Sub-base Installation

Typical Wiring Diagrams
2 Heat / 2 Cool System
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R
O
B
Y1
W1
Y2
W2
G
C
120V AC24 V Hot
1s
t
Stage
Cool Relay
Transformer
1s
t
Stage
Heat Relay
2nd Stage
Heat Relay
Stage
Cool Relay
Fan Relay
2nd

R
O
B
Y1
W1
Y2
W2
G
C
120V AC
24 V Hot
1s
t
Stage
Cool Relay
Transformer
1s
t
Stage
Heat Relay
2nd Stage
Heat Relay
Fan Relay
2 Heat / 1 Cool System
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Internal Switch Setting and Mounting the Thermostat to the Sub-base (See fig. 2)
1) Set the system switch (“heat-off-cool”) to the “off”position and the fan switch to
“Auto”(front face of the unit below the display).
2) Turn the thermostat over to expose the HG/HE (gas /electric) fan option,
and the F/C (Fahrenheit/Celsius) switches.
3) Gently move both switches to the appropriate settings (labeled on circuit board).
4) Carefully align the tabs at the top of the sub-base (fig.1) with the slots the top of the
edge of the thermostat housing (fig. 2).
5) Allow the thermostat to swing down while pressing on the lower edge until it latches.
6) Restore system power.
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