Trane BAYSENS019C Thermostat Operation Manual

The Trane BAYSENS019C is a programmable zone sensor designed for use with Constant Volume (CV) units and Heat Pump (HP) units, including 3-25 Ton Packaged Heat/Cool Units (ASYSTAT666C), 3-20 Ton Packaged Heat Pump Units, and 27.5-50 Ton Packaged Rooftop Units. It features 7-day scheduling with four periods per day, temporary overrides, morning warm-up, and communication via the Network Sensor Bus (NSB) with the Unit Control Module (UCM). Below are the key specifications and operation instructions.

Key Specifications

• Type: Programmable zone sensor for remote panel with NSB
• Compatibility:
  • 3-25 Ton Packaged Heat/Cool Units (ASYSTAT666C), 3-20 Ton Packaged Heat Pump Units
  • 27.5-50 Ton Packaged Rooftop Units
  • Communicates with UCM via terminals for HEAT, COOL, SYSTEM ON, SERVICE
• Power:
  • 24 VAC at terminals 11/14
  • 22-32 VDC for communications at terminals 11/12
• Temperature Range: Heat/cool setpoints; morning warm-up activates if 2°F below setpoint
• Dimensions: Compact wall-mount design; mounts on interior wall or 2x4 handy box
• Features:
  • 7-day programming with 4 periods/day (Occupied/Unoccupied)
  • Temporary overrides, status indicators (flashing colon for system ON, TEST/SERVICE icons)
  • Morning warm-up, supply air temperature sensor option
  • Economizer and changeover options
• Compliance: For experienced HVAC technicians; CAUTION for potential hazards

Operation Instructions

Initial Setup

1. Power On: After installation, apply power; displays Normal Run State with time, temperature, and mode.
2. Defaults: Clock at 12:00 AM Monday; unoccupied heat/cool setpoints.
3. Configure: Press PROGRAM + MODE for 4 sec to enter Option Menu for initial settings like morning warm-up.

Home Screen Navigation

1. Normal Run State: Shows time, zone temperature, heat/cool setpoints, day, and status icons (HEAT, COOL, FAN).
2. Controls: Use UP/DOWN arrows to navigate, TIME +/- for adjustments, DAY for toggling.
3. Indicators: Flashing colon for system ON; override screen for temporary changes.

Scheduling and Presets

1. Access Programming Menu: Hold PROGRAM for 2 sec; set 7-day schedule with 4 periods (start time, occupied/unoccupied, setpoints, supply air).
2. Preset Periods: Occupied/Unoccupied modes with heat/cool setpoints; supports warmup during transitions.
3. Exit: Hold PROGRAM for 2 sec to save.

Settings Screen

1. Option Menu: Press PROGRAM + MODE for 4 sec; use arrows to select options (e.g., morning warm-up: 0=disabled/1=enabled).
2. Temporary Override: Press HOLD TEMP; set new temperature, duration (hours/days via TIME +/- and DAY toggle).
3. Clock Format: 12/24 hour; exit by pressing PROGRAM for 2 sec.

Advanced Features

1. Morning Warm-Up: Automatically heats if zone is 2°F below setpoint during unoccupied-to-occupied transition.
2. Supply Air Sensor: Enable/disable via options for monitoring.
3. Test Mode: Flashing TEST icon; SERVICE icon for alerts via terminal 10.
4. Economizer/Changeover: Optional enable for advanced control.

Troubleshooting

• Display Not On: Check 24 VAC at terminals 11/14; verify terminal block position.
  
• No UCM Communication: Verify 22-32 VDC at terminals 11/12; check wiring.
  
• Unit Not Responding: Confirm connections to UCM terminals 7-10; test mode.
  
• Schedule Issues: Re-enter programming menu; check clock settings.

Installation Instructions

Warning: Experienced HVAC technicians only. CAUTION: Potentially hazardous; may cause minor/moderate injury. Disconnect power before wiring.

Pre-Installation

• Mount on interior wall near return air grille, ~5 ft above floor for free air circulation.
• Prepare 4 wires (HEAT, COOL, SYSTEM ON, SERVICE) from UCM; optional 3 wires for auxiliary relay.
• Wire sizes: See table below for max lengths.

Wiring Diagrams

Connect to UCM and power source:

Terminal	Connection
7	HEAT (to UCM)
8	COOL (to UCM)
9	SYSTEM ON (to UCM)
10	SERVICE (to UCM)
11/14	24 VAC Power
11/12	Communications (22-32 VDC)

Distance	Wire Size
Up to 150 ft	22 AWG
151-250 ft	20 AWG
251-400 ft	18 AWG
401-600 ft	16 AWG

Note: Use convention for UCM connections; optional auxiliary relay wiring.

Configuration Options

1. Mount sub base with screws (on wall or 2x4 box); hook ZSM top tabs and lock.
   
2. Power up for initial screen.
   
3. Enter Option Menu: Set morning warm-up, supply air sensor, economizer, changeover per table.
   
4. Program schedule via Programming Menu.

Option	Value	Default	Description
Morning warm-up	0=Disabled, 1=Enabled	0	Heat if 2°F below during transition
Supply air temp sensor	0=Disabled, 1=Enabled	0	Enables monitoring
Economizer	0=Disabled, 1=Enabled	0	Enables economizer
Changeover	0=Disabled, 1=Enabled	0	Enables changeover

Calculation Tool

Estimate monthly energy savings from morning warm-up vs. no scheduling (assumes 0.4 kWh per °F per hour; 2°F threshold factored; 20 days/month).