EPH Controls RDT Operating instructions

Installation and Operation Guide
Recessed Room Thermostat
RDT

2
Factory Default Settings
3
Specications
4
LCD Display
5
Buttons
6
Wiring
7
Mounting & Installation
12
Locking the Keypad / Backlight
13
Menu Function
20
24
11
On / O Function & Adjusting the Target Temperature
15
22
Table of contents
17
23
21
25
14
Installation Instructions
Operating Instructions
Delay Start Control (On/O)
P0 1 Operating Mode
Nor (Normal Mode)
Time Proportional Integral Mode (TPI)
P0 2 Setting High and Low Limits
P0 3 Hysteresis HOn and HOFF
P0 4 Calibrate
P0 5 Setback Mode
FP Frost Protection
Resetting the Thermostat

Mains operated non-programmable
Room Thermostat with Setback
Installation Instructions

2RDT
Factory Default Settings
High and Low Temp. limitation: O
Keypad lock: O
Operating mode: Normal
Temperature indicator: ˚C
Frost protection: On (5˚C)
Setback temperature: 0˚C
HYS On: 0.4˚C
HYS OFF: 0.0˚C

3
EPH Controls Ltd.
Specications
Contacts: Volt Free
Power supply / Input: 230VAC
Power consumption: <1W
Temperature range: 5…35˚C
Ambient temperature: 0…45˚C
Ambient admissible humidity: 5-95%RH
Contact rating: 10(3)A 230VAC
Dimensions: 95 x 95 x 40mm
Internal temperature sensor: NTC 100K
Backlight: White
IP rating: IP20
Pollution degree: 2
Hysteresis (Switching dierential): Adjustable from 0 to 1°C
0.1°C increments
Automatic action: 1C
Setback temperature: Adjustable 0 to 10˚C

4RDT
[1]
[10] [9] [8]
[11]
[3] [4] [5][2]
[6]
[7]
[12]
[1] Displays when setting target temperature.
[2] Displays current room temperature.
[3] Displays current / target temperature.
[4] Displays when changing mode setting.
[5] Displays when setting TPI mode.
[6] Displays when keypad is locked.
[7] Displays when the thermostat is calling for heat.
[8] Displays when thermostat is in the OFF mode.
[9] Displays when setting HIGH and LOW temperature limit.
[10] Displays during calibration mode.
LCD Display
[11] Displays when setting
hysteresis.
[12] Displays when
setback mode is
enabled.

5
EPH Controls Ltd.
Buttons
OK Button
Down Button Up Button
Standby Button

6RDT
Wiring
Terminal Connections
LLive In
NNeutral In
Terminal 1 OFF - N/C Normally closed connection
Terminal 2 ON - N/O Normally open connection
Terminal 3 COM - Common connection
Terminal 4 SB - Setback connection
230V on Terminal 4: Thermostat works in Normal mode
0V on Terminal 4: Thermostat works in Setback mode
* If mains output is required terminals L and 3 must be electrically linked.

7
EPH Controls Ltd.
Mounting & Installation
Caution!
Installation and connection should only be carried out by a qualied person.
Only qualied electricians or authorised service sta are permitted to open the
thermostat.
If the thermostat is used in a way not specied by the manufacturer, its safety may
be impaired.
Prior to setting the thermostat, it is necessary to complete all required settings
described in this section.
Before commencing installation, the thermostat must be rst disconnected from
the mains.
This thermostat can be mounted to a recessed conduit box.

8RDT
1) Remove the thermostat from its packaging.
2) Choose a mounting location so that the thermostat can
measure the room temperature as accurately as possible.
- Mount the thermostat 1.5 metres above the oor level.
- Prevent direct exposure to sunlight or other heating /
cooling sources.
3) Use the fastening clip on the base of the thermostat to release
the front housing from the rear wiring box as per diagram on
page 9.
4) Wire the thermostat according to the wiring diagram on page 6.
5) Screw the rear wiring box to the recessed back box.
6) Attach the front housing to the rear wiring box until it clips
securely into place.
Mounting & Installation Continued