User Guide

ErP energy efficiency ratings
The ErP energy efficiency ratings shown in this
brochure will provide installers and end users with
the information required to both complete the
ErP energy label and assess the benefits of the
heating controls to the overall heating system in the
property. These ratings apply to room thermostats
(including programmable thermostats).
Resideo Technologies, Inc.
200 Berkshire Place
Winnersh
Berkshire
RG41 5RD
For more information
heatingcontrols.honeywellhome.com
Installation
Simply remove the old programmer and replace with
ST9520C. This enables the wireless thermostats
(DT92E) to be added to the system. Otherwise,
install as per installation instructions supplied with
product. Remote boiler and remote valve installations
are possible with wireless relay boxes (supplied
separately).
The ST9520C and DT92E are radio frequency devices
and for best performance should be installed in a clear
space. Where possible, leave the ST9520C at least
30 cm from any metal objects, including wall boxes,
and at least 1 m from any other electrical equipment.
The 2 x DT92E are free to be installed in suitable
locations where the signal strength is high.
Wiring
For full wiring instructions, please refer to the Wiring
Guide or download the Honeywell Home Wiring Guide
App from the Apple App Store or Google Play Store.
SPECIFICATION
Pack 5
RF Operation Band
ISM (868.0 to 868.6 MHz), 1% duty cycle
RF Communication Range Typically 30 m in residential building
RF Communication Technology Two way short, high rate transmissions to minimise air
time / avoid interference
RF Blocking Immunity Receiver class 2
Operating Temperature Range 0 to 40°C
Operating Humidity Range 10 to 90% RH, non-condensing
Storage Conditions −20 to 55°C
10 to 90% RH, non-condensing
Standards CE marked
IP Rating IP30
ST9520C
Switch Rating 3(3)A max at 230 VAC
Switch Type 2x Single pole, double throw (SPDT) relay
Power Supply 230 VAC 50 Hz 10 W
Power Reserve Built-in battery maintains factory-set date and time. Backup
super capacitor retains real time for more than 1.5 hours
All settings and parameters stored in NVRAM will be
retained indefinitely
Wiring Wiring terminals with captive cage clamps, accepting two
wires each up to 2.5 mm
2
Time Setting Resolution Time of day – 1 minute
Programme time changes – 10 minutes
Time Display 24 hour or 12 hour AM/PM format
Timing Accuracy Typically better than 10 minutes per year
Time and date factory set
DT92E
Power Supply Two AA size, 1.5 V alkaline batteries
Temperature Setting Range 5 to 35°C in 0.5°C steps can be limited between 5 and
35°C
OFF Set point Temperature 5°C (default)
Can be set between 5 and 16°C or turned off
ECO Set point Temperature 18°C (default)
Can be set between 5 and 35°C (in 1°C steps), for 1 to
24 hours
Temperature Control Accuracy ±0.5 K at 20°C (50% load, 3 K/hr)
Download the new
Honeywell Home
‘Wiring Guide’ app
ENR3 0055 UK01 D0419
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