EPH Controls HRT Operating instructions

Installation and Operation Guide
Room Thermostat
HRT

2
Factory default settings
3
Specications
4
LCD Display
5
Buttons
6
Wiring
7
10
Mounting & installation
Replacing the batteries
13
Locking the Keypad / Backlight
14
Menu Function
20
24
12
On / O Function & Adjusting the target temperature
16
22
Table of contents
18
23
21
25
15
Installation Instructions
Operating Instructions
Delay Start Control (On/O)
PO 1 Operating Mode
Nor (Normal Mode)
Time Proportional Integral Mode (TPI)
PO 2 Setting High and Low limits
PO 3 Hysteresis HOn and HO
PO 4 Calibration
PO 5 Setback Mode
PO 6 Frost Protection
Resetting the Thermostat

Battery operated non-programmable Room Thermostat
Installation Instructions

2HRT
Factory default settings
Contacts: Volt Free
High and Low Temp. limitation: O
Keypad lock: O
Backlight: Auto
Setback: 0.0˚C (o)
Operating mode: Normal

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EPH Controls Ltd.
Specications
Power supply / Input: 2 x AA Alkaline Batteries
Power consumption: Operating <0.05W
Standby <0.1mW
Temperature range: 5 … 35˚C
Ambient temperature: 0 … 45˚C
Ambient admissible humidity: 5-95%RH
Contact rating: 8A 230Vac
Dimensions: 85 x 85 x 36mm
Temperature sensor: NTC 100K
Backlight: White
IP rating: IP20
Pollution degree: 2
Switching dierential: Adjustable from 0.0 – 1.0°C
0.1°C increments
Automatic action: 1C

4HRT
[1] [2]
[7]
[3]
[4][5]
[6]
[1] Shows the current / target temperature.
[2] Displayed when batteries need to be replaced.
[3] If the keypad is locked, the lock symbol is displayed.
[4] When the thermostat is calling for heat, the ame
symbol is displayed.
[5] When a high or low temperature limit is set, ‘LIM’ is displayed.
[6] Displayed when setback is enabled.
[7] Displayed when delay start is enabled.
LCD Display

5
EPH Controls Ltd.
Buttons
Handwheel Reset
Button
Standby Button

6HRT
Wiring
SB
ON
321
COM
230V on Terminal 1: Thermostat works in Normal mode
0V on Terminal 1: Thermostat works in Setback mode
Terminal Connections
Terminal 1 Setback
Terminal 2 Common
Terminal 3 On

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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 in the following ways:
1) Directly mounted on wall
2) To a recessed conduit box

8HRT
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) To open the front housing
a) use a philips screwdriver to loosen the screw on the bottom
right of the thermostat.
b) insert and rotate a 3.5mm at screwdriver into the slot on
the bottom left.
4) Wire the thermostat according to the wiring diagram on page 6.
5) Screw the backplate onto a back box or directly to the surface.
6) Close the front housing and tighten the screw on the bottom of
the thermostat.
Mounting & Installation Continued

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EPH Controls Ltd.
85
85
26
36
45 113
a)
b)

10 HRT
1) is displayed when the batteries need to be replaced.
2) Push in the battery compartment to release it.
3) Replace the batteries with 2 x AA Alkaline batteries.
4) Re-insert the battery compartment. Push it until it clicks into place.
Replacing the batteries

Battery operated non-programmable Room Thermostat
Operating Instructions

12 HRT
Press to turn the thermostat On or O.
When in the ON mode the thermostat will display the current ambient
temperature.
When in the OFF mode the thermostat will display the current ambient
temperature and the word ‘OFF’.
Rotate clockwise to increase the target temperature.
Press or wait 5 seconds. The target temperature is now saved.
Rotate anti-clockwise to decrease the target temperature.
Press or wait 5 seconds. The target temperature is now saved.
On / O Function
Adjusting the target temperature

13
EPH Controls Ltd.
Locking the Keypad
To lock the thermostat, press for 10 seconds.
will appear on the screen. The buttons are now disabled.
To unlock the thermostat, press for 10 seconds.
will disappear from the screen. The buttons are now enabled.
There are three settings for selection.
‘bL AUtO’ The backlight is on for 10 seconds when any button is pressed.
‘bL On’ The backlight is permanently on.
‘bL OFF’ The backlight is permanently o.
To adjust the backlight setting, press for 10 seconds.
‘bL AUtO’ appears on the screen.
Rotate to change the mode between AUTO, ON and OFF.
Press to conrm selection and to return to normal operation.
Backlight AUTO

14 HRT
Menu Function
This menu allows the user to adjust additional functions.
There are three settings for selection, Normal, Delay Start or TPI mode.
The default setting is Normal.
Press and hold the and together for 5 seconds,
P01 & Nor will appear on the screen,
Press to select.
Rotate to select between
Nor (Normal mode)
dS (delay start mode)
tPi (Time proportional integral mode)
Press to conrm the mode.
PO 1 Operating Mode (Normal / Delay Start / TPI)

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EPH Controls Ltd.
Nor (Normal Mode)
When the temperature falls below the target temperature, will
appear and the thermostat will activate the demand for heat.
When the temperature rises above the target temperature, will
disappear, and the thermostat will cancel the demand for heat.
PO 1 Operating Mode (Normal / Delay Start / TPI)
22˚C
21˚C
20˚C
19˚C
18˚C
17˚C
Temp
Time Minutes
Graph (15.1): On / O Control
Target Temperature
200 40 60 80 100

16 HRT
Delay Start Control (On/O)
When the delay start mode is active, ‘dS’ will appear continuously on the
screen. When in this mode the thermostat is delayed by a variable time
depending on the current temperature, target temperature and also the
fall in temperature from when the delay start has activated.
The will ash until the thermostat activates.
When activated the thermostat will allow the heating system time to reach
the target and delay start will remain inactive until it reaches this target.
E.g: If the temperature is 6˚C
below the thermostat target,
the thermostat will call for
heat immediately.
If the temperature is 2˚C
below the target, the
thermostat will not call for
heat for 32 minutes.
48
42
36
30
24
18
12
6
0
0123456
Temperature below thermostat setting °C
Time delay after Delay Start activated in minutes
Graph (16.1): Delay Start Control
PO 1 Operating Mode (Normal / Delay Start / TPI)

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EPH Controls Ltd.
Delay start can be reactivated by:
1. Lower the target below the current temperature.
2. Press to set the temperature.
3. Increase the target above the zone temperature within 6° .
4. Press to conrm.
The heating will be delayed as per the graph on page 16.
If the dierence between the actual temperature and the target is 1°C
the thermostat will delay starting for circa 40 minutes.
If the dierence between the actual temperature and the target is 3°C
the thermostat will delay starting for circa 24 minutes.
If the dierence is 6°C or more then the thermostat will be switched on
immediately.
The time delay will change if the temperature drops from the original
calculation.

18 HRT
Time Proportional Integral Mode (TPI)
When the thermostat is in TPI mode and the temperature is rising in the
zone and falls into the Proportional Bandwith section, TPI will start to
aect the thermostats operation. The thermostat will turn on and o as it
gains heat so that it doesn’t overshoot the target by too much. It will also
turn on if the temperature is falling so it doesn’t undershoot the target
which will leave the user with a more comfortable level of heat.
There are 2 settings that will aect the thermostats operation
1. The number of heating cycles per hour
2. The Proportional Bandwith
CyC – Number of Heating Cycles per hour 6 Cycles
This value will decide how often the thermostat will cycle the heating on
and o when trying to achieve the target temperature. You can select
2/3/6 or 12.
PO 1 Operating Mode (Normal / Delay Start / TPI)