White Rodgers 350 User Manual

The White Rodgers 350 is a mechanical thermostat designed to replace various heating and cooling systems, including standard heat/cool (4/5 wires), heat-only, millivolt heat-only (floor/wall furnaces), central air conditioning, gas/oil/electric furnaces, hydronic zone heat (2/3 wires), heat pumps (with/without aux/emergency), and baseboard electric heating (120/240V). It features adjustable heat anticipator (0.15-1.2A), level mounting for accuracy, and compatibility with Class II circuits. Below are the key specifications, installation, operation, configuration, and troubleshooting instructions.

Preparations

Assemble tools: hand or power drill with 3/16 inch drill bit (if needed), flat blade screwdriver, wire cutter/stripper, spirit level or plumb bob and line. Shut off electricity at main fuse box until installation complete. Label wires before disconnecting. This thermostat is for low voltage systems; not for line voltage except baseboard (120/240V). Install away from drafts, direct sunlight, or heat sources for accurate sensing. Thermostat must be level to work properly.

WARNING! Failure to read and follow all instructions carefully before installing or operating this control could cause personal injury and/or property damage. Save these instructions.

Description

The thermostat consists of a cover, base, and switching subbase. It controls heating and cooling systems based on temperature setting. Features adjustable heat anticipator for precise control matching primary heating control current. LCD not applicable; mechanical dial or lever for setpoint.

Applications:

Precautions

CAUTION! To prevent electrical shock/equipment damage, disconnect power at main fuse/circuit breaker until installation complete. Label wires prior to disconnection. If in doubt about wiring, consult qualified heating/air conditioning contractor. Installation and components must conform to Class II circuits per NEC code.

WARNING! Do not use on circuits exceeding ratings; higher voltage damages control/causes shock/fire. Do not short terminals to test. All wiring must conform to local/national codes.

Specifications

• Electrical: Heat anticipator 0.15-1.2A; Class II circuits.
• Batteries: None.
• Setpoint Range: Not specified; typical mechanical range 40-90°F.
• Operating Ambient: Standard room conditions; must be level.
• Humidity: Not specified.
• Shipping: Not specified.
• Dimensions: Standard wall mount.
• Other: Mechanical; compatible with various systems including heat pumps.

Removing Old Thermostat

A standard heat/cool thermostat consists of three basic parts: Cover (snap-on/hinge), Base (captive screws), Switching Subbase (mounting screws). Label each wire with terminal designation before disconnecting. Disconnect wires one at a time; do not let fall into wall. Note heat anticipator setting (.2, .4, .8, etc.) for reference.

Installation

Remove old thermostat. Loosen three screws to separate base from subbase. Mount subbase to wall/adaptor plate with mounting screws. Connect wires to corresponding terminals. Reattach base to subbase and install cover. Ensure level using spirit level or plumb bob/line. Keep area clear of wires.

Wiring Diagrams

Terminal Designations: R (hot), C (common), G (fan), Y (compressor), W (heat), O/B (changeover for heat pumps).

Standard Heat/Cool (4/5 Wires): R to hot, W to heat, Y to cool, G to fan, C common.

Heat-Only: R to hot, W to heat.

Millivolt: W to gas valve.

Heat Pump: R hot, Y compressor, O/B changeover, W aux/emergency.

Baseboard (120/240V): Direct line voltage connection per codes.

CAUTION! Match old thermostat configuration. Refer to equipment manuals for specifics.

Check Operation

Restore power. Set to HEAT/COOL, adjust setpoint to test.

Fan Operation

1. FAN ON: Blower runs continuously (if wired).
2. FAN AUTO: Blower runs on call for heat/cool.

Heating System

1. System HEAT.
2. Setpoint above room temp: Heat activates.
3. Setpoint below: Heat stops.

Emergency System

1. For heat pumps: Switch to EM HEAT if equipped.
2. Setpoint above: Aux/emergency heat operates.

Cooling System

CAUTION! Do not operate below 50°F.

1. System COOL.
2. Setpoint below room temp: Cool activates.
3. Setpoint above: Cool stops.

Operating Features

• Home Screen: Mechanical; no display.
• Key Features: Adjustable anticipator, level mounting, wide compatibility.
• Range Limits: Typical 40-90°F.

Programming

Non-programmable mechanical thermostat. Set desired temperature via lever or dial.

Installer Configuration

Set heat anticipator to match old thermostat or primary control current (0.15-1.2A). Rotate contact arm to setting (.2, .4, .8, etc.). Ensure level installation.

Troubleshooting