Hotowell HTW-51-2000 DIGITAL THERMOSTAT Product Specification Guide

Hotowell HTW-51-2000 DIGITAL THERMOSTAT

General

The TF228WN digital thermostat is designed for 3-speed fan and valve control in a fan coil system, including: 2-pipe cool only/heat only/manual changeover Ventilation mode Manual or automatic 3-speed fan control Water valve control Besides the basic controls, TF228WN featuring CPH (Cycle Per Hour) better maintains the room temperature to the set-point and memorized time off function can automatically turn off the thermostat to save energy. In addition, Honeywell Random start-up function would help to maintain power grid stability.

Features

• Memorized time off
• Cycle Per Hour (CPH)
• Random startup
• LCD display with simple user interface
• Room temperature or setpoint temperature display selectable
• Manual or automatic fan speed selectable
• Temperature units in either °C or °F
• User setting can be stored with power loss
• Freeze protection available
• Four keypad lock options
• Heating and cooling setpoint limitation
• Flush mount on standard 86 wall mounting box

Specifications

• Power supply 220(+10%,-15%)VAC, 50Hz
• Control PI, On/off output
• Accuracy ±1°C at 21°C
• Rating capacity 3A for fan load,
• 2A for zone valve
• Protection class IP20
• Set point range 10 ~ 32°C
• Display range 0 ~ 37°C
• Ambient operating limits 0~ +49°C
• Ambient storage limits -30 ~ +49°C
• Humidity limits 5~90% RH, non-condensing

Table 1. Model Selection

Model Number	Backlight	Application	Power supply	Ventilation Mode	Automatic Fan	Packing
TF228WN	White	2-pipe FCU	220 Vac, 50Hz	Y	Y	bulk packing
TF228WN/U	White	2-pipe FCU	220 Vac, 50Hz	Y	Y	unit packing

Product Design Thermostat Appearance

LCD Display

Function Valve Control

Thermostat measures the room temperature via integrated sensor and maintains the setpoint by delivering on/off valve control command outputs. The fan setting can be selected as manual or automatic 3-speed operation. When in “manual” mode, the fan is switched to the selected speed via control output FH (high), FM (Medium) , FL (Low). While in “automatic“ mode, fan speed depends on the differ-ence between room temperature and setpoint. When room temperature reaches the setpoint, the valve will be closed, and the fan will be closed in the meanwhile.

Temperature Display
The displayed temperature can be set to room temperature or setpoint. The setting can be changed during ISU (Installation Set Up) process.

Cycle Per Hour (CPH)
In order to achieve more accurate temperature control, the CPH function enables the thermostat to open the valve several times per hour as the room temperature gets close to the se-point. The value can be changed in the ISU, but the default values are 4 for heating and 3 for cooling.

Memorized Time 0ff
The time off feature will automatically turn off the thermostat after a selectable amount of time. To change the time setting, press and hold the power button for more than 3 seconds and press “up” and “down” button to change the value when the thermostat is working

Backlight
To turn on the backlight, press any key. The backlight will timeout 8 seconds after the last key is pressed. When in ISU and Installation test mode, the backlight will timeout 60 sec-onds after the last key is pressed.

Keypad Lockout
Keypad lockout can be set in ISU and the default status is “all keys available”. Keypad lock can be optioned to “mode button locked”, “Fan and mode buttons locked”, “all buttons (except power button) locked” and “all buttons locked”.

Dimensions (mm)

Operating Mode

Comfort Mode
In comfort mode, the setpoint can be changed by pressing up and down button. Applications include cool only, heat only and manual heat/cool changeover

Ventilation Mode
Press mode button to enter “ventilation” mode. In “ventilation” mode, no output for valve while the fan will operate at selected fan speed.

Freeze Protection Mode
Freeze protection can be selected as disabled (default) or enabled in the ISU. In freeze protection mode (only in heating applications), when thermostat is off and the temperature is below 6 ℃, the thermostat will activate heating mode until the temperature rises to 8℃.

Wiring

Terminal Designations

Item	Terminal	Description
1	L	220VAC live wire
2	N	220VAC neutral wire
3	vC	Heating / Cooling valve close
4	vO	Heating / Cooling valve open
5	FH	High speed fan
6	FM	Medium speed fan
7	FL	Low speed fan

Trouble Shooting

If	Then…
Heating system does not respond	·         Set the mode to heating by press- ing the mode button. ·         Make sure the temperature is set above the room temperature. ·         Make sure “heat on” icon shows on the display. ·         Wait 5 minutes for the system to respond.
Cooling system does not respond	·         Set the mode to cooling by press- ing the mode button. ·         Make sure the temperature is set below the room temperature. ·         Make sure “cool on” icon shows on the display. ·         Wait 5 minutes for the system to respond.
The fan doesn’t work	·         Make sure fan mode isn’t set to auto. ·         Check heating or cooling system works well.
The mode or fan button doesn’t work	·         Make sure keypad is unlocked. ·         Check that thermostat is on.
The up or down button doesn’t work	·         Make sure keypad is unlocked. ·         Make sure the system doesn’t work in ventilation mode. ·         Check that thermostat is on.
The system turns off automatically	·         Make sure the memorized time off value isn’t set to “0”.

REFERENCE

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Hotowell HTW-51-2000 DIGITAL THERMOSTAT Product Specification Guide

Hotowell HTW-51-2000 DIGITAL THERMOSTAT Product Specification Guide