A small bimetal sensing element is located in the air switch that opens on temperature rise to limit the maxi- stream for quick response. These controls have a fixed mum allowable temperature in forced air heating sys- temperature setting and fixed differential. THIS CONTROL MUST BE INSTALLED BY A QUALIFIED INSTALLER. All wiring must conform to local and national electrical codes and ordinances. This control is a precision instrument, and should be handled carefully. Rough handling or distort

These controls incorporate system fault analysis for quick gas flow shut-off, coupled with automatic ignition retry upon sensing a fault correction. Signals interpreted during continual surveillance of the thermostat and flame sensing element initiate automatic ignition of the burner, sensing of the flame, and system shut-off during normal operation. TRANE APPLICATION - Installer MUST read page 3 “Mounting and Wiring” PRECAUTIONS Installation should be done by a qualified heating and air conditi

This feature gives unusual speed of response to rapid changes of water temperature thereby preventing thermal lag. It has open on rise contact action. This control may be used as a high limit or as a low limit control. These controls have special contacts which are suitable for use on low voltage and millivolt (thermocouple generator type) circuits as well as line voltage gas valve and motor loads. DESCRIPTION THESE CONTROLS MUST BE INSTALLED BY A QUALIFIED INSTALLER. Do not exceed the specifica

Do not exceed the specification ratings. All wiring must conform to local and national electrical codes and ordinances. This control is a precision instrument, and should be handled carefully. Rough handling or distorting components could cause the control to malfunction. CONTENTS Description ......................................................... 1 Precautions ........................................................ 1 Specifications ..................................................... 2 Inst

For the second attempt to ignite gas within the same call for heat, the control increases the ignitor temperature to the value it was on the third previous successful ignition. After ignition is successful, the control sets the ignition temperature at this value for the next 255 calls for heat, after which the control repeats the adaptive algorithm. The control is constantly making adjustments to the ignitor temperature to compensate for changes in the line voltage. The 80 VAC Silicon Nitride ig

DO NOT LET WIRES FALL BACK INTO WALL. 3. Connect wires beneath terminal screws on subbase using appropriate wiring schematic (see figs. 3 through 8). 4. Place subbase over hole in wall and mark mounting hole locations on wall using subbase as a template. (Installation instructions continue on page 5.) TABLE 1. OLD THERMOSTAT IDENTIFICATION OLD THERMOSTAT TYPE OLD THERMOSTAT TERMINAL IDENTIFICATION Type 1 4 W RC Y G Type 2 RH W RC Y G Type 3 M H V C F Type 4 R5 4 Y6 G Type 5 R W Y G TABLE 2. WIRE

The user may program up to four time/temperature settings per 24 hour period. The thermostat stores independent heating and cooling programs for each day of the week. The thermostat will store both heating and cooling programs simultaneously. Three "AA" Energizer® batteries will maintain the stored program for approximately one year, if incoming power should fail. If power failure is extensive and the program is lost, after power restoration, the thermostat will automatically maintain a factory

This thermostat offers you the flexibility to design heating and cooling programs that fit your needs. Features: • Separate program for each day of the week • Simultaneous heat and cool program storage • Preprogrammed temperature control • Four separate time/temperature settings per 24 hour period This thermostat is intended for use with a 24 volt system; do not use this thermostat with a millivolt or line voltage system. If in doubt about whether your wiring is millivolt, line, or low voltage,

This electric or fossil fuel auxiliary. SPECIFICATIONS 1F94-371: 7 Day programming; residential applications ELECTRICAL DATA Electrical Rating: 20 to 30 VAC, 50/60 Hz with common 0.05 to 1.5 Amps per terminal 2.5 Amps maximum total load (all terminals combined) Standard Systems: Single-stage or two-stage compressor heat pump. THERMAL DATA Setpoint Temperature Range: 45° to 99°F (7° to 37°C) Operating Ambient Temperature: 32° to 110°F (0° to 43°C) Operating Humidity Range: 90% non-condensing max.

DESCRIPTION The type 668 Oil Burner Control provides safe operation of oil burners on heating plants where ignition during the entire burner cycle is desired. The 668 is used with the 956 Flame Detector * Formerly called constant ignition. PRECAUTIONS If in doubt about whether your wiring is millivolt, line, or low voltage, have it inspected by a qualified heating and air conditioning contractor, electrician, or someone familiar with basic electricity and wiring. Do not exceed the specification