2 3Wiring Centre MODEL: UFH8-RF
InstallationUH8-RF - Installation Manual
Description
The UH8-RF is an 8 Zone central wiring centre for use with SOLFEX
RF thermostats.
The UH8-RF can be used to control any actuator or valve which
requires a 230v AC signal. At the same time the UH8-RF oers the
ability to operate a boiler or other heat source through a volt free
output with changeover contacts, which gives you both a heat on
signal and a heat o signal.
Additional outputs designed for use with hot water or underoor
heating systems, are also included as standard. These are the pump
and valve outputs which would normally operate a manifold pump
or a manifold valve, and the H/W output which is used to send a
hot water on and hot water o signal.
Any output which is not needed can be ignored.
99 channel numbers are available allowing up to 99 dierent
UH8-RF wiring centres to be operated in close proximity. With 8
thermostats per wiring centre this gives you up to 792 distinct
heating zones.
When wiring directly to the heat source is not possible, a radio link
is provided to remotely enable a separate receiver, the RF-Switch.
Test switches are included for the installation engineer and further
options include creepage protection and pump delay.
Operation
Each RF thermostat used on this system can be congured as a
thermostat for either a radiator zone, underoor heating zone or in
combination mode, hot water and heating zone.
When the thermostat sends a signal for heating, the UH8-RF will
provide a 230v AC output on the paired zone and also bring on the
boiler/other heat source output. At the same time the UH8-RF can
send a radio signal to the RF-Switch.
If the thermostat is congured as an underoor heating zone, the
UH8-RF will also start the pump and valve outputs.
If an enable signal is received from a hot water time clock on the
system, only the H/W output will become active. This is a timed
output, which is normally fed to a cylinder thermostat, then to a valve,
but could also be used for towel rails. In either case the valve auxiliary
switch would operate the boiler/other heat source.
Other functions
Creepage
During hot weather the heating is not normally needed as often, this
means that valves and pumps that are not being used can seize and
refuse to operate. To prevent this, it is good practice to operate the
valve or pump once a day, the creepage function does this for you.
Once enabled the UH8-RF will operate each valve or pump for 1
minute, only if the outputs have not been operated by a thermostat,
within the preceding 24 hours. This function does not operate the
boiler output.
Pump Delay
Some valves or actuators can take more than a minute to open, if
the boiler and pump operate before the valve is open it can force a
boiler to go to lockout and stop operating. This function delays the
operation of the pump and boiler for 2 minutes to give the actuators
and valves time to open.
Engineers Test Switches
These switches allow the installation engineer to test the operation
of the valves, actuators, pumps hot water or boiler, without having to
install the thermostats.
The UH8-RF can be mounted directly to a wall using four screws or
alternatively, the unit can be DIN rail mounted.
When DIN Rail mounting, you rst need to insert the two clips
provided on the back of the UH8-RF, as shown in the image;
t On the back of the UH8-RF, position the clip in the middle and slide
down.
t Points A and B locate in the corresponding holes and lock into place.
t Locate the UH8-RF onto the DIN rail from the top.
t Pull the clip down and push the bottom of the UH8-RF onto the DIN rail.
t Releasing the clip will lock the UH8-RF in place on the DIN rail.
To remove the UH8-RF, pull both clips down and remove from the
DIN rail.
B
A
Insert clip here.
Then Slide down to lock in place.
