Carrier A07051 Installation Instructions Manual

Also see for A07050: Installation instructions

Contents

Carrier A07051 Installation Instructions Manual Manual pdf 22 page image

22Five--Minute Compressor TimeguardThis timer prevents the compressor from starting unless it has been off for 5minutes. It can be defeated for one cycle by simultaneously pressing the FANand UP keys.Minimum On TimerOnce the equipment has been turned on, it must remain on for 3 minutes. Achange in mode or setpoint will cancel this timer.Cycle TimerBased on the selection of 2, 4, or 6 cycles per hour, this timer is set to 30, 15, or10 minutes. This much time must elapse from the start of one cycle beforeanother cycle can start. It serves to impose the cycles per hour limits. It can bedefeated for one cycle by simultaneously pressing the FAN and UP keys.Auto Changeover TimerTo prevent unnecessary cycling between heating and cooling modes, this timerprevents a changeover to the opposite mode until a demand exists in the oppositemode for 20 minutes. It is defeated when setpoints are changed so that theopposite mode is immediately available if desired.Error CodesTwo error messages indicate problems with the thermostat’s operation. If theroom temperature sensor fails, the temperature display will show ----, two dashes.If there is an internal memory failure, the temperature display will show E4. Theremedy for each of these is to replace the thermostat.Table 1 shows the thermostat outputs for each available stage of heating orcooling. It may be useful in checkout or troubleshooting.