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Carrier Aquazone 50QE900-NPWS Owner's Manual
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Carrier Aquazone 50QE900-NPWS Owner's Manual

Commercial digital thermostat
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OWNER'S MANUAL
Commercial
Digital Thermostat
Carrier
73
o
74
Designed for Commercial Water Source Heat Pumps
Commercial Systems & Services
P/N 50QE900-NPWS
A Q U A Z O N E
Dual Setpoint
Large, Easy To Read Display
Thermoglow
Backlight
No Batteries Required
Auto Changeover
Adjustable Deadband
B or O Terminal
Locking Keypad
Locking Cover with
Tamper proof Screws
F or C
Carrier
Carrier Corporation 3/00

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Summary of Contents for Carrier Aquazone 50QE900-NPWS

  • Page 1 Carrier Thermoglow Backlight No Batteries Required Auto Changeover Adjustable Deadband B or O Terminal Locking Keypad Locking Cover with Tamper proof Screws F or C Designed for Commercial Water Source Heat Pumps Carrier Commercial Systems & Services Carrier Corporation 3/00...

  • Page 2: Table Of Contents

    BASIC OPERATION ADVANCED SETUP ABOUT ADVANCED OPERATION WARRANTY CAUTION Follow Installation Instructions before proceeding. SET THERMOSTAT TO MODE “OFF” PRIOR TO CHANGING SETTINGS IN SETUP OR RESTORING FACTORY DEFAULTS. P/N 50QE900-NPWS Commercial Systems & Services Carrier Corporation 3/00 Page 1...

  • Page 3: Front Panel

    Front Panel Carrier Setup OFFON AUTO Liquid Crystal Display with Thermoglow Up/Down Buttons Mode Button Fan Button Heat or Cool Indicator Heat = Red, Cool = Green Page 2...

  • Page 4: Display

    Display Setup OFFON AUTO Mode Indicators Selects the operation mode of the equipment. - indicates the heat mode. - indicates the air conditioning mode. AUTO - indicates the system will automatically changeover between heat and cool modes as the temperature varies. - indicates the entire system is turned off.
  • Page 5 Display Setup Indication Indicates the thermostat is in the Advanced Setup mode. Page 7. Fan Operation Indication - indicates constant, continuous fan operation. When Fan On is not lit - indicates the fan will only operate when necessary to heat or to cool.

  • Page 6: Basic Operation

    Basic Operation Select Mode The HEAT setting indicates the temperature the room has to reach before the furnace will turn on to heat the room. Press MODE The COOL setting indicates the temperature the room has to reach before the air conditioner will turn on to cool the room.

  • Page 7: Select Desired Temperature

    Basic Operation Select Desired Temperature In any mode, adjust the desired Set Temperature with AUTO buttons. Pressing the up/down buttons in Auto mode will adjust both the heat and cool set temperatures simultaneously. Pressing the up/down buttons in Heat or Cool modes will adjust only the heat or cool set temperature.

  • Page 8: Advanced Setup

    Advanced Setup Press the Mode button. MODE While holding the Mode, NOTE: Each step # is located at the top right corner of the press the Fan button for display for easy reference. 7 seconds to enter Setup screens. Setup Adjust the deadband from 1 - 6 degrees.
  • Page 9 Advanced Setup Setup Select the display back- light always On, or Off after 8 seconds. Press MODE Setup Select thermostat operation in degrees Fahrenheit or Centigrade. Press MODE Continued Page 8...

  • Page 10: Advanced Setup Table

    Advanced Setup Setup Select the reversing valve polarity for Heat Pump, O or B. (Step 2 only appears if heat pump is on in step 1) MODE Press the Mode button. While holding the Mode, press the Fan button for 2 seconds to leave the Setup screens.

  • Page 11: About Advanced Operation

    About Advanced Features & Operation 2 STAGE OPERATION - The 2nd Stage of heat or cool is turned on when (1) the 1st Stage has been on for a minimum of two minutes, and (2) the temperature spread from the setpoint is equal to or greater than: the setpoint plus the deadband, plus 2 degrees.
  • Page 12 About Advanced Features & Operation EMERGENCY HEAT - To turn on Emergency Heat press in the Fan button. While holding the Fan button press the Up button for 2 seconds. The Cool setpoint display will read ‘EH’. Press for Emergency Heat During Emergency Heat the thermostat will turn on the fan and the 2nd stage of heat, when there is a demand for heat, locking out the 1st stage compressor.
  • Page 13 About Advanced Features & Operation KEYPAD LOCK - To prevent unauthorized use of the thermostat, the front panel buttons may be disabled. To disable, or ‘lock’ the keypad, press and hold in the Mode button. While holding the Mode button in, press the Up and Down buttons in together.
  • Page 14 About Advanced Features & Operation DUAL SETPOINT BEHAVIOR - The adjustable setpoint range is: 35 - 99 degrees in Fahrenheit and 7 - 35 degrees in Centigrade. When in the modes Heat or Cool, this adjustable range is unhampered. When adjusting any Auto mode, the thermostat will not allow the Heat setpoint to get closer to the Cool setpoint than the value programmed as the minimum difference in...
  • Page 15 Mode button once more. At this point use the Up and Down buttons to calibrate room temperature, if needed. Press the Mode button to return to normal operation. NOTE CAUTION ON PAGE 1. LOCKING COVER w/Tamper Proof Screws Carrier Page 14...

  • Page 16: Warranty

    Warranty One-Year Warranty - This Product is warranted to be free from defects in material and workmanship. If it appears within one year from the date of original installation, whether or not actual use begins on that date, that the product does not meet this warranty, a new or remanufactured part, at the manufacturer’s sole option, to replace any defective part will be provided without charge for the part itself;...