Instruction Manual

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MODELS

500 1 HEAT/1 COOL

505 HEAT ONLY

507 COOL ONLY

USER MANUAL

Builder Series

Mercury-Free Mechanical Thermostats

with the Exclusive Megaswitch

™

Magnetic Switch Technology

Compatible with low voltage, single stage gas, oil or electric heating or

cooling systems. Model 500 can be used with single stage heat pumps.

Models 500 & 505 can also be used on 250mv to 750mv millivolt heat only

systems. Do not use on applications with voltages above 30 Volts AC.

READ ALL INSTRUCTIONS BEFORE PROCEEDING

WARNING!

Important Safety

Information

• Always turn off power to air conditioning or heating system prior to installing, removing cleaning or servicing thermostat.

• Read this manual thoroughly prior to installing or operating this thermostat.

• This thermostat is designed for use with 24 Volt-AC low voltage single stage gas, oil or electric heating or cooling systems,

including single stage heat pumps (Model 500 only). This thermostat can also be used on 250mv to 750mv millivolt heating

only systems (Models 500 and 505).

• Do not use this thermostat on applications with voltage above 30 Volts AC.

• The system must have 24 Volt AC present for proper system operation and control.

• Wiring must conform to all building codes and ordinances as required by local and national code authorities

having jurisdiction.

• Do not short (or jumper) across terminals on the gas valve or at the heating or cooling system control board to test the

thermostat installation. This could damage the thermostat and void the warranty.

• Do not select COOL mode of operation if the outside temperature is below 50° F (10° C). This could possibly damage the

controlled cooling system and may cause personal injury.

• This thermostat should only be used as described in this manual. Any other use is not recommended and will void warranty.

SPECIFICATIONS

• Electrical Rating: 24 Volt AC (18-30 Volt AC), 250 – 750 millivolts

• Heat Anticipation: 0.15 to 1.2 amps.

• Temperature Range: 50° - 90° F (10° - 32° C)

Old Terminal New Terminal Terminal Description

V or Rc Rc Cooling Transformer

M, 4, Rh or R Rh Heating Transformer

O O Reversing Valve (Cooling)

B B Reversing Valve (Heating)

Y Y Cooling or Compressor for HP system

H, W or 4 W Heating Control

G or F G Fan Control

INSTALLATION

1. Always turn off power to the air conditioning or heating system prior to removing existing thermostat.

2. Remove the cover of old thermostat and locate wire terminals. Do not remove wires from terminals yet.

3. Label wires prior to removal from terminals. Use chart below to determine new terminal designations for new thermostat.

2.1

Replacing Existing Thermostat

2.2

Installing Your New Thermostat

NOTE: This thermostat is designed for use with a 24 Volt AC low voltage single stage gas, oil or electric heating or cooling

systems, including single stage heat pumps (Model 500 only). This thermostat can also be used on 250mv to 750mv millivolt

heating only systems (Models 500 and 505). Do not use this thermostat on applications with voltages above 30 Volts AC.

1. Always turn off power to the air conditioning or heating system prior to installing new thermostat.

2. Place system lever to OFF position, and fan control lever to AUTO position.

3. Remove the front cover of the thermostat by ﬁrmly pulling it away from the base.

4. Place thermostat base against wall in the desired thermostat location and guide thermostat wires through

vertical slot in base.

5. Mark placement of mounting holes as appropriate and drill using a 3/16” drill bit.

6. Gently tap supplied plastic anchors into the holes in the wall.

7. Place the thermostat base against the wall in the desired location making sure the mounting holes are aligned as

appropriate and the thermostat wires are properly inserted through the slotted opening in the base.

NOTE: If installing this thermostat in a new installation, be sure to locate the thermostat 4 to 5 feet above the ﬂoor in

accordance with applicable building codes. Be sure to install thermostat in a location that provides good airﬂow

characteristics and avoid areas behind doors, near corners, air vents, direct sunlight or near any heat generating device.

Installation in any of these areas could impact thermostat performance.

8. Fasten the base to wall using supplied screws.

9. Connect wires to proper terminal screws using new terminal designations (see Wiring Diagrams section of manual).

10. Make sure all of the wire connections are secure and are not touching any other terminal to prevent electrical shorts

and potential damage to the thermostat.

11. Locate the internal fan option jumper, HG (Gas) or HE (Elec) on the base (Model 500 only). This jumper controls the

heating system fan delay. Insert the jumper over the pins labeled HG for gas or oil ﬁred systems. This will allow the

furnace to run for a few seconds before initiating the fan. Insert the jumper over the pins labeled HE for electric

systems with electric furnace elements that require the fan to come on immediately and for heat pump systems.

12. Attach front cover of thermostat to base of the thermostat by pressing it onto the four corner posts of base.

13. Restore system power so you can test installation.

4. After labeling and removing all wires from terminals, unscrew the existing thermostat mounting base from wall. Be sure

to secure wires to prevent them from slipping back into the hole in the wall.

Summary of content (3 pages)

PAGE 1
2 MODELS 500 1 HEAT/1 COOL 505 HEAT ONLY 507 COOL ONLY Builder Series Mercury-Free Mechanical Thermostats with the Exclusive Megaswitch ™ Magnetic Switch Technology USER MANUAL Compatible with low voltage, single stage gas, oil or electric heating or cooling systems. Model 500 can be used with single stage heat pumps. Models 500 & 505 can also be used on 250mv to 750mv millivolt heat only systems. Do not use on applications with voltages above 30 Volts AC.
PAGE 2
3 INSTALLATION cont. 2.3 Setting the Heat Anticipator NOTE: TESTING YOUR NEW THERMOSTAT cont. WARNING! For heat pumps, DO NOT place system lever back in the HEAT position. Quick repetitive cycles of the system compressor can lead to damage and shorten its life expectancy. Some heating systems require a longer or shorter “ON/OFF” period to maintain comfort.
PAGE 3
6 6 WIRING DIAGRAMS WIRING DIAGRAMS Typical 4-Wire Single Transformer Heating and Cooling System O Factory Installed Jumper G Rc Rh B Factory Installed Jumper O G Fan Control Heat Control Reversing Valve Cool Control Rc Rh Hot Side Transformer Hot Side Transformer Fan Control Typical Single Stage Heat Pump Reversing Valve Active in Cooling W Y 24 Volt AC Transformer B Y W See Note 1 Compressor Control 24 Volt AC Transformer 120 Volt AC 120 Volt AC NOTES: cont. NOTES: 1.