Lennox ComfortSense 7500 Commercial Installation And Setup Manual
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Lennox ComfortSense 7500 Commercial Installation And Setup Manual

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®
ComfortSense
7500 Commercial
507506-02
6/2018
Installation and Setup Guide
Supersedes 5/2017

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Summary of Contents for Lennox ComfortSense 7500 Commercial

  • Page 1 ® ComfortSense 7500 Commercial 507506-02 6/2018 Installation and Setup Guide Supersedes 5/2017...

  • Page 2: Table Of Contents

    Table of Contents Description Shipping and Packing List ....® The ComfortSense 7500 commercial thermostat is Description ......electronic 7-day universal...

  • Page 3: Installation

    Also, if a power loss occurs, the system will go into compressor protection mode and display “waiting” CAUTION next to either a snow flake (compressor cooling), or flame (compressor heating) in the display. This is a 24VAC low-voltage thermostat. Do not install on voltages higher than 30VAC.
  • Page 4 temperature sensor (may be separate wire Drafts or dead spots behind doors and pair or two wires of a multi-wire cable for in corners. outdoor temperature sensor). Not close to entrance or automatic doors. Ensure load from any thermostat connection is less than 1 AMP. Not close to heat generating equipment such as kitchen equipment.
  • Page 5 CUT OR DRILL A SMALL HOLE PULL ABOUT 3” OF THERMOSTAT FOR THERMOSTAT WIRING WIRE THROUGH OPENING AND RE­ MOVE OUTER THERMOSTAT WIRE JACKET. ¾” x ¾” THIS WILL HELP IN ROUTING THE THER­ MOSTAT WIRING TO THE PROPER THER­ MOSTAT TERMINALS (USE A LEVEL) ALIGN WALL PLATE TRIM 1/4”...
  • Page 6 Thermostat Installation with Wall Plate F - Place wall plate H - Attach back plate J - Attach thermostat to over holes in wall. to wall plate. back plate. G - Insert wall anchors I - Insert provided screws through back and wall through wall plate into wall.
  • Page 7 Wiring Thermostat Dehumidification relay W2 - Second-stage heating (non-heat pump) or Below are the terminal designations and a general fourth-stage (heat pump) description of their purpose. Y2 - Second-stage heating or cooling 1. Connect wiring between thermostat, indoor O/B - Heat/Cool active reversing valve and outdoor units.

  • Page 8: Menu

    Settings installer settings < menu installer settings must be set by qualified person. notifications confirm performance report Figure 3. Installer Menu Screen Confirmation edit schedules settings Figure 2. Menu Screen Menu 1. Touch menu option from the home screen. 2. Touch and hold the settings option on the menu.
  • Page 9 Sensors Settings Installer Settings Use the following information to install sensors and Sets the thermostat for operation with either a heat setup in the user interface. pump or condenser unit and defines the number of Indoor Outdoor < compressor stages and the number of backup heat stages (gas, electric or both).
  • Page 10 Outdoor Sensor (small commercial split systems This thermostat can support one to five remote only) indoor temperature sensors. Users have three options to select from under Installer Settings > An outdoor temperature sensor (X2658) is required sensor settings > indoor sensor: ®...
  • Page 11 One sensor Two sensors - - (1) 47W36 (2) 47W37 Three sensors - Four sensors - (2) 47W36 and (4) 47W36 (1) 47W37 Five sensors - (3) 47W36 and (2) 47W37 Figure 6. Indoor Sensor Configurations (Option 2, 20K Setting)
  • Page 12 Residual Cool 5. Low Balance Point Default is 25°F. Adjustable range is -40°F to 48°F. Default is 0 seconds. This is the time, in seconds, that the fan runs after a call for cooling is satisfied in 6. High Balance Point Default is 50°F. Adjustable order to deliver any residual cooling ability from the range is -38°F to 75°F.
  • Page 13 NOTE - Smooth Set Recovery and SSR STG 2 Touch < to return to previous menu. Lock Out operations vary depending on equipment Temperature Offset (see table 1). Default is 0°F. This setting can be used to offset the SSR Stage 2 Lock Out displayed space temperature by up to +/- 5°F.
  • Page 14 When SSR is enabled then SSR When SSR is disabled then SSR Stg 2 Equipment Available Stg 2 lock out is automatically lock-out setting is disabled. enabled. S Run heat pump (Y1) until a second- S Run heat pump (Y1) only stage heating demand is needed which is determined by the time / temperature S All backup heat (W1) is en­...
  • Page 15 When SSR is enabled then SSR When SSR is disabled then SSR Stg 2 Equipment Available Stg 2 lock out is automatically lock-out setting is disabled. enabled. S Run heat pump (Y1/Y2). S Run HP (Y1/Y2) until a second-stage Two-stage heat pump demand is needed which is determined S All backup heat (W1/W2) is with:...
  • Page 16 Stage 2 Through 4 Delays H/C Stages Locked In When disabled the heat/cool stages are turned off (Where applicable) If STG DELAY TIMERS is separately). When enabled (default), heat/cool turned ON, the default delay is 20 minutes but can stages are turned off together. Touch < to return to be programmed from 5 to 120 minutes in 5-minute previous menu.
  • Page 17 1st stage 1st stage Stages Stg1 Differential Locked = 2nd stage 2nd stage Stg2 Differential 1st stage 1st stage Stages Stg1 Differential Locked = 2nd stage 2nd stage Stg2 Differential SET­ SP -1.5 SP -1.0 SP -0.5 SP +0.5 SP +1.0 SP +1.5 SP +2.0 POINTS:...
  • Page 18 1st stage 1st stage Stages Stg1 Differential Locked = 2nd stage 2nd stage Stg2 Differential 3rd stage 3rd stage Stg3 Differential 1st stage 1st stage Stages Stg1 Differential Locked = 2nd stage 2nd stage Stg2 Differential 3rd stage 3rd stage Stg3 Differential SET­...
  • Page 19 1st stage 1st stage Stages Stg1 Differential Locked = 2nd stage 2nd stage Stg2 Differential 3rd stage 3rd stage Stg3 Differential 4th stage 4th stage Stg4 Differential 1st stage 1st stage Stages Stg1 Differential Locked = 2nd stage 2nd stage Stg2 Differential 3rd stage 3rd stage...
  • Page 20 1st stage 1st stage Stages Stg1 Differential Locked = 2nd stage 2nd stage Stg2 Differential 3rd stage 3rd stage Stg3 Differential 1st stage 1st stage Stages Stg1 Differential Locked = 2nd stage 2nd stage Stg2 Differential 3rd stage 3rd stage Stg3 Diff.
  • Page 21 1st stage 1st stage Stages Stg1 Differential Locked = 2nd stage 2nd stage Stg2 Differential 3rd stage 3rd stage Stg3 Differential 4th stage 4th stage Stg4 Differential 1st stage 1st stage Stages Stg1 Differential Locked = 2nd stage 2nd stage Stg2 Differential 3rd stage 3rd stage...
  • Page 22 Compressor Protect To set a reminder go to the User Settings screen and select reminders. The reminder setting screen will Default is ON and it can be turned OFF, however appear and a list all of the predefined reminders plus only for one compressor cycle and then it will revert the two custom reminders will appear at the end of back to ON.
  • Page 23 Table 2. Energy Saving Set Points Fan Setting Time Heating Cooling The thermostat default setting is Occ1 70°F (21°C) 76°F (24°C) Auto two period only. Unocc1 55°F (10°C) 85°F (29.5°C) Auto To use four peri­ ods, change the Occ2 70°F (21°C) 76°F (24°C) Auto appropriate setup...

  • Page 24: Dehumidify Mode

    Dehumidify NOTICE Terminal D State Mode Setting De-energized for dehumidification Risk of equipment damage. and energized for all other modes. Can cause compressor failure. De-energizing D terminal is used to Normal, Max reduce the speed of the indoor In dual fuel system applications, do not turn on or Humiditrol blower during dehumidification.
  • Page 25 Normal 4. Dehumidification demand exists (RH above set point). In this mode, dehumidification occurs if these ® conditions are met and signals are present at Humiditrol specific terminals: This setting is for commercial split systems only. If Humiditrol is enabled in the installer settings, then 1.

  • Page 26: Economizer

    In this case, 24VAC is removed from the D terminal Relative Humidity controls to within 3% on either and Y1 and Y2 terminal (if available) becomes side of RH set point. activated with 24VAC. This cycles the indoor When dehumidify mode is in NORMAL or MAX or, variable speed motor to the dehumidification speed HUMIDITROL, "D"...

  • Page 27: Unit Part (Catalog) & Serial Numbers

    A label on the back of the thermostat is visible through an opening in the back of base plate. This identifies the Lennox Catalog Number, Part Number and Serial Number. Separate the base plate from the thermostat to see additional manufacturing information.

  • Page 28: Start-Up Sequence Of Operations

    Start-Up Sequence of Operations START HUMIDITROL RUN EQUIPMENT there a cooling IN NORMAL COOL­ Is indoor demand ING MODE temperature > 2ºF above heating set point RUN EQUIPMENT there a heating IN NORMAL HEAT­ demand ING MODE Humiditrol Com­ indoor temp. greater than the heat fort Adjust setting setpoint plus the cool...

  • Page 29: Diagnostic Information

    Diagnostic Information Priority 0:high Error Message Action to Clear / Screen Text Condition System Action Type Recovery Condition Code 1:middle 2:low All stages of heat are turned off High temperature protec­ Once temperature high tem­ by safety relay. tion when outdoor ambient drops below 96°F perature critical...
  • Page 30 Priority Error Message Action to Clear / 0:high Screen Text Condition System Action Type Recovery Condition Code 1:middle 2:low For Outdoor Temperature Sensor: No Humiditrol or Humidity oper­ ation. D terminal stays activated and other operation will continue to operate. Thermostat will stop the system operation if input from requires outdoor temperature informa­...
  • Page 31 Priority Error Message Action to Clear / 0:high Screen Text Condition System Action Type Recovery Condition Code 1:middle 2:low With humidifier or dehu­ midifier) and conditions are All humidity operation will stop as follows: and the reading for humidity 0%: Stat will detect error will not be valid.

  • Page 32: Reminder Information

    Reminder Information Error Message Screen Text Action to Clear / Recovery Condition Code Type replace media filter replace UV lamp replace humidity pad routine system check-up reminder Touch either done to clear the reminder or remind later button. replace metal insert for pure air user editable user editable...

  • Page 33: Supported Configurations

    Supported Configurations This thermostat support air conditioner and heat pump systems with one or two speed compressors. It also supports dual-fuel and Humiditrol accessory. For all possible configuration see table below. Backup/ Indoor Backup/ 2nd Em Heat Indoor Heat heat Cool Cool Comp.

  • Page 34: Installation Checklist

    Backup/ Indoor Backup/ 2nd Em Heat Indoor Heat heat Cool Cool Comp. Heat 2nd Heat 3rd Heat 4th Heat 1st Em Heat Cool Stages Heat Stage Stage Stage Stage stages Stages Stage Stage Stage Stage Stages GAS/OIL ELEC. W1+W2 Y1+Y2 NONE Y1+Y2 Installation Checklist...
  • Page 35 INDEX Features, 2 Balance Points, Low, High, 12 H/C Stages Locked In, 16 Humidification Sensor Fault, 26 Compressor Protection, 22 Humidity Offset, 13 Humidity Setting, 22 Compressor Short Cycle Protection, 3 Configurations, 16 Contractor Information, 13 Memory Protection, 27 Custom Reminders, 22 Outdoor Temperature Sensor, 10 Deadband, 12 Dehumidify, 24...
  • Page 36 Stage 1 Differential, 15 Stage 2 HP Lock Temp, 16 Temperature Offset, 13 Stage 2 through 4 Delays, 16 Stage 2 through 4 Differential, 15 Unit Part (Catalog) & Serial Numbers, 27 Stage Delay Differentials, 15 Stage Delay Timer, 15 System Test Modes, 23 Wall Anchors, 2...

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