T2--PAC, T2--NAC T2--PHP, T2--NHP LEGACYt SERIES THERMOSTATS Installation Instructions A07047 Legacy Series Programmable Thermostat A07046 Legacy Series Non ---Programmable Thermostat NOTE: Read the entire instruction manual before starting the installation
TABLE OF CONTENTS PAGE SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 INSTALLATION CONSIDERATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Step 1 — Thermostat Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
signifies a hazard which could result in personal injury or death. CAUTION is used to identify unsafe practices which may result in minor personal injury or product and property damage. NOTE is used to highlight suggestions which will result in enhanced installation, reliability, or operation. INTRODUCTION Bryant’s Legacyt Series programmable thermostats are wall--mounted, low--voltage thermostats which maintain room temperature by controlling the operation of a heating and/or air conditioning system.
Power All Legacy Series models are dual powered. They can operate from batteries or 24VAC power. Operation from 24VAC is preferred if available. Battery operation is used when there are not enough wires to support 24VAC operation or when “armchair programming” is desired. For an AC system, 5 wires are needed for 24VAC operation and 4 wires for battery operation. For a HP system, 6 wires are needed for 24VAC operation and 5 wires are sufficient for battery operation.
S In areas with poor air circulation, such as behind a door or in an alcove. Step 2 — Install Thermostat ! WARNING ELECTRICAL OPERATION HAZARD Failure to follow this warning could result in personal injury or death. Before installing thermostat, turn off all power to equipment. There may be more than 1 power disconnect. 1. Turn OFF all power to unit. 2. If an existing thermostat is being replaced: a. Remove existing thermostat from wall. b. Disconnect wires from existing thermostat, 1 at a time.
! CAUTION ENVIRONMENTAL HAZARD Failure to follow this caution may result in environmental damage. Mercury is a hazardous waste. Federal regulations require that Mercury be disposed of properly. 3. Open thermostat (mounting base) to expose mounting holes. The base can be removed to simplify mounting. Press the thumb release at the top of the thermostat and snap apart carefully to separate mounting base from remainder of thermostat. 4. Route thermostat wires through large hole in mounting base.
5. Drill two 3/16--in. mounting holes in wall where marked. 6. Secure mounting base to wall with 2 anchors and screws provided (additional anchoring holes available for more secure mounting if needed) making sure all wires extend through hole in mounting base. 7. Adjust length and routing of each wire to reach proper terminal and connector block on mounting base with 1/4 in. of extra wire. Strip only 1/4 in. of insulation from each wire to prevent adjacent wires from shorting together when connected.
Rc - 24 VAC, from cooling equipment Rh - 24 VAC, from heating equipment W - Heating C - Common 24 VAC O/B - reversing valve G - Fan Not used Y - Cooling A07159 Fig. 3 -- Terminal Designations ! CAUTION ELECTRICAL OPERATION HAZARD Failure to follow this caution may result in equipment damage or improper operation. Improper wiring or installation may damage the thermostat. Check to make sure wiring is correct before proceeding with installation or turning on unit. 9.
A07158 Fig. 4 -- Attach Thermostat to Backplate 11. Close thermostat assembly making sure pins on back of circuit board align with sockets in connector. 12. Turn ON power to unit. When power is applied, all display icons are lit for 2 seconds to test the display. Following this, the equipment type for which the thermostat is configured is displayed for an additional 2 seconds. It will be one of HP, AC, H, PH, PC or C (see explanation under Step 3, Option 01 below).
set by the installer. (Only those marked with an asterisk * below are available to the homeowner.) Following is a list of the options available, an explanation of their function, and their factory default settings. Not all numbers are used in the Legacy Series because not all options are available in this series -- and numbering is consistent across the T1, T2, and T6 thermostat lines.
To Enter the Configuration Mode: Press and hold the FAN key for about 10 seconds until the display changes so that only two pairs of digits are showing. The left (programmable version) or the large upper (non--programmable version) display shows the configuration number and the right (programmable version) or small lower (non--programmable version) shows the configuration setting. Configuration number will be flashing which means it can be adjusted using the UP and DOWN keys.
C operates a cool only system: outdoor AC unit with an indoor fan coil; no strip heater support. Note that this option allows a HP thermostat to be converted to control an AC system. Option 03 -- Fahrenheit/Centigrade Selections: F = Fahrenheit — Default is Fahrenheit. C = Centigrade. Selects temperature measurement units. Option 04 -- Fan (G) ON with W output Selections: OF = G not energized with W — This is default. ON = G energized with W.
Option 10 -- Reversing valve This selection is only available on heat pump systems. “O” terminal can be configured to be energized in either heating mode or in cooling mode, depending on heat pump operation. “O” is used to describe a heat pump system that energizes its reversing valve in cooling. “B” is used to describe a heat pump system that energizeS its reversing valve in heating. H — Reversing valve output (O/W2/B) is energized when HEAT mode is selected.
Option 13 -- Room Air Temperature Offset Selections: --5 to 5_ F — Default is 0. This option selects the number of degrees F to be added to the displayed temperature to calibrate or deliberately miscalibrate the measured room temperature. Option 15 -- Auto Changeover Availability Selections: ON — This is default. OF ON allows automatic changeover between heating and cooling as demand requires. OF maintains either heating or cooling mode only.
times can reduce the amount of auxiliary heat used. Not available with AC thermostats. Option 18 -- Backlight Configuration Selections: ON, OF — Default is OF. When ON is selected and the thermostat is not battery operated a low level continuous display backlight is always on. With OF selected, the backlight is only on for a short time after the door is opened or a key is pressed. Continuous backlight is not available with battery operation. Option 21 -- Keypad Lockout Selections: ON, OF — Default is OF.
Selecting 2 allows 2 programming periods, P1 and P2, per day. Selecting 4 allows periods P1, P2 , P3, and P4. Not available with non--programmable thermostats. Option 26 -- Minimum Cooling Setpoint Selections: 52_F to 90_F — Default is 52_F. Sets the lowest cooling setpoint available to the user. Option 27 -- Maximum Heating Setpoint Selections: 50_F to 88_F — Default is 88_F. Sets the highest heating setpoint available to the user.
Step 4 — Check Thermostat Operation The Legacy Series thermostats have a built--in installer test capability. Use it to check thermostat and equipment operation without delays or setpoint adjustments to force heating or cooling. To enter the Installer Test mode, use the same process as is used to enter Installer Configuration, only hold the FAN key longer.
Checklist 1. Run equipment through several heating and cooling cycles to ensure proper operation. To operate the thermostat in its normal operating mode, consult the Owner’s Manual. 2. If the equipment is to be left in operation, the setpoints, operating mode, and possibly program schedule must be properly selected. 3. Put away tools and instruments and clean up debris. 4. Review and leave Owner’s Guide with owner.
Homeowners Guide for details. If batteries are installed and the thermostat is operated from 24VAC power, battery operation will occur only when 24VAC power is not present. The changeover between 24VAC power and battery power is automatic. Display Lighting The display has two levels of lighting, high level and low level. High level lighting comes on for 10 seconds when the door is opened and/or buttons are being pressed with 24VAC and with batteries.
complete itself. If, through some wiring error or failure in the HP, the signal on the O line remains for longer than 15 minutes, the thermostat ignores it and allows Y to be turned off when it is satisfied. If the B function is selected (using Option 10), the thermostat cannot sense when a defrost occurs. As a result, it cannot guarantee that defrost cycles will run to completion. If the thermostat becomes satisfied during a defrost, it will turn off the compressor.
Five--Minute Compressor Timeguard This timer prevents the compressor from starting unless it has been off for 5 minutes. It can be defeated for one cycle by simultaneously pressing the FAN and UP keys. Minimum On Timer Once the equipment has been turned on, it must remain on for 3 minutes. A change in mode or setpoint will cancel this timer. Cycle Timer Based on the selection of 2, 4, or 6 cycles per hour, this timer is set to 30, 15, or 10 minutes.
Table 1 – Outputs EQUIPMENT CONFIGURATION OPTION #1 THERMOSTAT FACTORY CONFIGURATION AC, PC AC, HP Y, G HP, PH RVS = C HP Y, G, O/B HP, PH RVS = H HP Y,G Y, G, O/B COOL STAGE 1 23 HEAT STAGE 1 HEAT STAGE 2 EM HEAT W --- --- --- --- Y, G Y, G, W W Y, G, W, O/B W
WIRING DIAGRAMS * * C wire not needed for batteries A07819 Fig. 5 -- A/C Thermostat Typical Installation * * C wire not needed for batteries A07820 Fig.
Single-Stage Furnace Thermostat RVS/Heat Stage 2 O/B W2 Heat Stage 1 W/W1 Compressor Low Y1 Compressor High Y/Y2 Y Fan G G 24VAC Hot Heating Rh R 24VAC Hot Cooling Rc Dry Contact 1 D1 Dry Contact 2 D2 24VAC Common C Humidify HUM Single-Stage Air Conditioner W Y R COM Outdoor Air Temp OAT Humidifier Solenoid Valve * Remote Room Sensor RRS Outdoor Sensor * OAT/RRS Com OAT/RRS Remote Room Sensor * * COM A07170 Fig.
THERMOSTAT CONFIGURATION RECORD Installer _________________________ Model Number ______________________________ Date _________________________ A. Hardware Configuration __________ Seal Hole In Wall B. Mode Settings __________ Mode (Off, Heat, Cool, Auto, Em Heat) __________ Heating Setpoint Value __________ Cooling Setpoint Value __________ Fan (Auto or On) C. Home, Away, Sleep Settings Home Away Sleep Heat Cool ____ ____ ____ ____ ____ ____ D.
E.
E2007 Bryant Heating & Cooling Systems 7310 W. Morris St. Indianapolis, IN 46231 Printed in U.S.A. Edition Date: 09/07 Catalog No. IIT2---PAC ---02 Manufacturer reserves the right to discontinue, or change at any time, specifications Replaces: IIT2--- PAC--- 01 or designs without notice and without incurring obligations.
