Danfoss RESD Series

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RESD Series Electronic Thermostat User Manual
RESD series thermostat adopts a button-hidden fashion appearance design. It
is used to control temperature for light industry, commercial and residential
environments. Models are available for heating, cooling and ventilating control. The
application is for the control of Fan Coil heating/cooling equipment.
RESD series thermostats are microprocessor controlled and have a big LCD
display, which displays the current working state (cooling, heating, ventilating), fan
speed, ambient temperature, setting temperature etc. pushbutton includes turn on/off
( ), mode ( ), clock (

), fan speed ( ) and temperature adjustment (   ).
MODEL DENOMINATIONS
BASIC FEATURES STATUS DISPLAY

Room temperature setting

Manual or Auto 3-speed changeover

Defrost (low temperature protection)

Clock, Timer
,
7 days programmable (-T74)

Blue backlight

Auto Restart ( Option )

Keypad Lock ( Option )

Working Status: Cool , Heat , Ventilation

Fan Speeds: Low , Medium , High and Auto

Room temperature display

Temperature setting display

FCU valve

Clock week display
SPECIFICATIONS
 Sensing element: NTC
 Accuracy: Temperature ± 1°C Time ± 1 min/month
 Set-point range: 5 to 35°C
 Display range: 0 to 55°C
 Operation environment: T min 0°C T max 45°C)
 Power supply: 85 to 260V~, 50/60Hz
 Switch current rating: Resistive: 2 A, Inductive: 1 A
 Switching action Type 1B
 Control pollution degree 2
 Rated impulse V 2.5kV
 Ball Hardness 75°C
 Power reserve 24 hrs minimum
 Setting accuracy ±0.5°C ±1 minute
 Rated Power: < 1 W
 Wirings: Screw-in terminals, each terminal capable of
accepting 2 × 1.5 mm
2
or 1 x 2.5 mm
2
wires
 Housing: PC + ABS Flame Retardant
 Dimensions: 86 × 86 × 13 mm ( W × H × D )
 Hole pitch: 60 mm ( Standard )
 Protection Class: IP30
 Display: LCD
RESD -
HC2: Control Motorized Valve and 3-speed fan. When the temperature reaches the set-point, it will close the
Motorized Valve and Fan both.
HC4: Control 4 pipe fan coil units, Control two Motorized Valves and 3-speed fan. When the temperature reaches the
set-point, it will close the Motorized Valve and Fan both.

Danfoss RESD Series Specifications

General

Brand	Danfoss
Model	RESD Series
Category	Thermostat
Language	English

Summary

RESD Series Electronic Thermostat User Manual

Model Denominations

Differentiates HC2 and HC4 models for fan coil control applications.

Basic Features

Lists core functionalities like temperature setting, fan control, defrost, and clock.

Specifications

Details technical specifications including sensing element, accuracy, power, and dimensions.

Status Display

Explains the information shown on the thermostat's LCD screen.

Operation

OnOff and Temperature Setting

Instructions for powering the device and adjusting the target temperature.

Mode Selection

How to choose between cooling, heating, and ventilation modes.

Fan Speed Control

Guide to selecting fan speed: Low, Medium, High, and Auto.

Clock Calibration

Procedures for setting the current time and date accurately.

Timer Functions

Steps to set, modify, and cancel timer schedules for operation.

Advanced Features

7 Days Programming

Detailed guide for setting up four daily events with start times and temperatures over seven days.

Keypad Lock

How to enable and disable the keypad lock feature for security.

Auto Restart

Explains the thermostat's behavior and status after a power interruption.

Defrost (Low Temperature Protection)

Details the function that activates heating to prevent freezing.

Alarm Codes

Information on error indicators (E1, E2) and temperature alerts (HI, LO).

Installation

Opening the Clip

Step 1: Instructions on how to open the thermostat's retaining clip.

Wiring Connections

Step 2: Guide for correctly connecting the electrical wires to the thermostat terminals.

Securing the Thermostat

Step 3: How to mount the thermostat firmly to the wall using screws.

Final Assembly

Step 4: Process for attaching the thermostat surface and completing the installation.

Installation Attention

Important safety and maintenance notes for proper installation and device protection.