Honeywell ST799 PRODUCT DATA

ST799

The ST799 electronic dual zone timer

with two ON/OFF periods per day.

FEATURES

•

Wallplate compatibility with 24-hour version (ST699)

ELECTRONIC DUAL

ZONE TIMER

PRODUCT DATA

is used to control gravity, primary or
fully pumped central heating systems
requiring a single 7-day programme

ST799 incorporates a simple and
intuitive programming concept which
established the 24-hour version
(ST699) as the leading electronic dual
zone timer on the market.

ST799 is designed for European CEN
approval.

• 7-day programme

• Weekday/weekend programme option (installer link)

• Independent heating and hot water channels

• One or Two ON/OFF periods per day

• Built-in programme

• Temporary programme override/advance

• 7-day battery back-up

• Compact size

• AM/PM or 24 hour clock format (factory option)

• 10 minute programme resolution

• 3 A resistive/inductive (@ 0.6 pf) 230 V~ SPDT relay

rating

• Simple/intuitive programming concept

• Copy day feature

• Surface or wallbox mounting options

• Pack contains everything for immediate installation

EN0R 8440 R0

ST799 ELECTRONIC DUAL ZONE TIMER

DIMENSIONS

INSTALLATION

SPECIFICATIONS

Product type

: Electronic dual zone timer

Programme day

: 03.00 AM to 02.50 AM (on the next day)

Wiring

: Surface or single

wallbox (UA1 size)

Protection class

ORDERING SPECIFICATION

Power supply : 230 V~ (±10%), 50 HZ
Power reserve : Rechargeable battery with 7 days

backup following a 24 hour charging
period

Switch rating : 2 x SPDT potential free

3 A resistive @ 230 V~ (± 10%), 50 Hz
3 A inductive @ 0.6 pf

Programme : 7-day with two ON/OFF periods daily

5/2-day (weekday/weekend) option by
installer link

Programme
resolution

Override : Advance next programme time

: 10 minutes

(change)

Wiring access : Rear or bottom edge (surface wiring

access)
Wire gauge : 0.75 to 2.5 mm2 two max. per terminal
Dimensions : 100 x 100 x 38 mm (w x h x d)

: IP20 (IEC 529)

Environmental : Operating temperature range 0 to 45oC

Shipping and storage temperature

range -20 to 55oC

Humidity range 0 to 90% rh, non-

condensing
Approvals : Designed to meet European CEN

approval EN60730
Life : 7 years minimum

ST799A1003

100

Mounting

Remove the subbase from the timer by depressing the
securing clip A and pulling the two halves apart. See fig. 1

The ST799 can either be mounted onto the wall surface or a
flush mounted UA1 (with 60.3 mm pitch mounting holes)
using the screws supplied.

Weekday/Weekend Programme

To convert timer from 7-day programme to 5+2 day
(Weekday/Weekend) programme, cut and remove link LK1
on the main circuit board.

IMPORTANT

1. The installer must be a trained service
engineer

2. Disconnect the power supply before beginning
installation

EN0R 8440 R0 2

Fig. 1