Carrier Programmable Thermostats Installation, Start-up, And Operating Instructions Manual

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programmable thermostats

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Programmable ThermostatsInstallation, Start-Up, and Operating InstructionsNOTE: Read the entire instruction manual before starting theinstallation.This symbol → indicates a change since the last issue.SAFETY CONSIDERATIONSRead and follow manufacturer instructions carefully. Follow alllocal electrical codes during installation. All wiring must conformto local and national electrical codes. Improper wiring or installa-tion may damage thermostat.Recognize safety information. This is the safety-alert symbol .When you see this symbol on the equipment and in the instructionmanual, be alert to the potential for personal injury.Understand the signal words DANGER, WARNING, and CAU-TION. These words are used with the safety-alert symbol. DAN-GER identifies the most serious hazards which will result in severepersonal injury or death. WARNING signifies a hazard whichcould result in personal injury or death. CAUTION is used toidentify unsafe practices which would result in minor personalinjury or product and property damage.INTRODUCTIONCarrier’s 7-day programmable thermostats are wall-mounted, low-voltage thermostats which maintain room temperature by control-ling the operation of a heating and air conditioning system.Separate heating and cooling setpoints, plus auto changeover allowsetback programming for maximum energy savings. All of thethermostats allow up to 4 time/temperature settings to be pro-grammed per 24 hr period and store programs for 7 independentdays. Batteries are not required; during a power interruption, theinternal memory stores programs for an unlimited time and theclock continues to run for at least 72 hrs.INSTALLATION CONSIDERATIONSPowerNote that all TSTAT models require no batteries and are not″power stealing″. They do require 24VAC (R and C terminals) tobe connected for proper operation. Thermostat will not operatewithout these 2 connections.ModelsThere are 3 different models. The 9th and 10th letters of the partnumber indicate the model. These 2 letters appear on the packageand on the circuit board. Be sure to have the proper thermostat forthe intended application. Models are:AC - 1-stage cool, 1-stage heat - for AC systems only.HP - 1-stage cool, 2-stage heat - for either HP or AC with 2-stageheat.2S - 2-stage cool, 2-stage heat - for 2-speed AC systems, or2-stage cool, 3-stage heat - for 2-speed HP systems, or1-stage cool, 4-stage heat - for 1-speed HP with special3-stage electric heat.Use each only for its intended purpose. (See Table 1.)INSTALLATIONStep 1—Thermostat LocationThermostat should be mounted:• Approximately 5 ft (1.5m) from floor.• Close to or in a frequently used room, preferably on an insidepartitioning wall.• On a section of wall without pipes or duct work.Thermostat should NOT be mounted:• Close to a window, on an outside wall, or next to a door leadingto the outside.• Exposed to direct light and heat from a lamp, sun, fireplace, orother temperature-radiating object which may cause a falsereading.• Close to or in direct airflow from supply registers and return-airgrilles.• In areas with poor air circulation, such as behind a door or inan alcove.Step 2—Set DIP SwitchesThere are 4 small switches on the back of the circuit board whichmust be set by the installer. The ON position is indicated by smallletters on the switch itself. Ignore numbers 1-4 on the switch. Theswitch designation (A through D) is on the circuit board next to theswitch. To change a switch position use the corner of a smallscrewdriver to slide it between on and off. Make these selectionsBEFORE installing the thermostat--it is much easier.Switch A - Zoning Select (Active on all models)This switch selects or defeats the 4 cycles per hour limit and a5-minute compressor timeguard. These timers MUST be enabledfor normal operation and disabled for zoning applications. (Inzoning applications the zone control center performs these timingfunctions.)TO SET:OFF— for normal operation. This is the factory default.ON—for zoned installations ONLY.Fig. 1—Carrier Programmable ThermostatA94134®HEIGHT (IN.) WIDTH (IN.) DEPTH (IN.)4-1/4 7-1/2 1-3/8Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.Book 1 4Tab misc. misc. PC 101 Catalog No. 92-33TS-TA38C Printed in U.S.A. Form TSTAT-10SI Pg 1 9-96 Replaces: TSTAT-7SI