Carrier 50QE900-250FS owner manual Contents, General, Configuration, Thermostat Display

50QE900 Aquazone™ Water Source Heat Pump Flush-Mounted Flatstat Commercial Programmable Thermostat

Owner’s Manual

Part Number 50QE900-250FS

IMPORTANT: Read entire instructions before program- ming the thermostat.

CONTENTS

Page GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

CONFIGURATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4 Thermostat Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Heat or Cool Indicator . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Thermostat Front Panel Buttons . . . . . . . . . . . . . . . . . 1 Keypad Lock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Set Clock. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Program Thermostat Schedules. . . . . . . . . . . . . . . . . . 2

OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Auto-Changeover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Two-Stage Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Clock Backup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Fan Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Emergency Heat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Holiday Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Dry Contact Switch. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Remote Temperature Sensor . . . . . . . . . . . . . . . . . . . . . 4

GENERAL

Carrier’s Aquazone 7-day, commercial, programmable ther- mostats are flat, wall-mounted, low-voltage thermostats which maintain room temperature by controlling the operation of an HVAC (heating, cooling and ventilation) system. Separate heating and cooling set points and auto-changeover capability allow occupied and unoccupied programming schedules for energy savings.

All thermostats allow up to 3 occupied and one unoccupied time/temperature settings to be programmed per 24-hour peri- od. Each thermostat stores programs for 7 independent days. Batteries are not required. During power interruption the inter- nal NEVERLOST™ memory stores programmed schedules for an unlimited time.

IMPORTANT: The thermostat has a configurable secu- rity level. If certain functions are not available (changing set points, changing programming schedules), the ther- mostat security level may be configured to exclude those functions. Call the installer to reconfigure the security level.

CONFIGURATION

Thermostat Display — The thermostat display is locat- ed in the center of the thermostat. See Fig. 1. The following information can be displayed on the screen:

•mode (OFF, HEAT, COOL, AUTO, or PROGRAM ON)

•fan setting (FAN ON or blank)

•override indication

•room temperature

•desired temperature

•service filter indicator

•time of day

•day of the week

•schedule period (Occupied 1, 2, or 3; or Unoccupied)

•setup indicator (Programming mode)

•lock indicator

•start/stop indicator (schedule period Programming mode)

Heat or Cool Indicator — A Heat or Cool indicator is located in the middle of the thermostat. See Fig. 2. The light will be red if the thermostat is in Heating mode. The light will be green if the thermostat is in Cooling mode.

Thermostat Front Panel Buttons — The thermostat has buttons on the front cover which are used to raise or lower the desired set point, change the mode, program, and override the current program. See Fig. 2.

SET POINT BUTTONS — The UP ARROW and DOWN ARROW buttons will raise or lower the current desired tem- perature set point. If the thermostat is in AUTO mode, pressing the UP ARROW or DOWN ARROW buttons will adjust both the heating and cooling set points. Pressing the UP ARROW or DOWN ARROW buttons in Cooling mode will adjust only the

Fig. 1 — Thermostat Display

Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.

Book	1	4	PC 111	Catalog No. 535-00111	Printed in U.S.A.	Form 50QE-4SO	Pg 1	6-03	Replaces: New
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