Model: UH4

UH4 – Installation Manual Installation

Description The UH4 can be mounted directly to a wall using four screws or
alternatively, the unit can be DIN rail mounted.
The UH4 is an 4 Zone & Hot water wiring centre for use with Heatmiser
230v thermostats. When DIN Rail mounting, you first need to insert the two clips
The UH4 can be used to control any actuator or valve which requires a provided on the back of the UH4, as shown in the image;
230v AC signal. At the same time the UH4 offers the ability to operate a
boiler or other heat source through a volt free output. • On the back of the UH4, position the clip in the middle
An additional output designed for use with underfloor heating and slide down.
systems, is also included as standard. This is the pump/valve Output, • Points A and B locate in the corresponding holes and
which would normally operate a manifold pump or a manifold valve. lock into place.
The H/W output provides a 230v hot water enable signal to the valve, • Locate the UH4 onto the DIN rail from the top. Insert clip here.
the auxiliary wires of the valve are wired to the Gr & Or terminals. • Pull the clip down and push the bottom of the UH4 onto Then Slide down to lock in place.
Zone 4 can be used as an isolated radiator zone by using the the DIN rail.
Yes/No switch. • Releasing the clip will lock the UH4 in place on the DIN rail.
If the switch is set to NO;
To remove the UH4, pull both clips down and remove from the DIN rail.
When zone 4 calls for heat this will provide an output to a radiator
zone valve and the boiler but WILL NOT enable the underfloor heating
pump/valve output.
A
If the switch is set to YES;
B
When Zone 4 calls for heat, this will act as an underfloor heating zone,
by enabling the actuator, boiler and pump/valve outputs.
Any output which is not needed can be ignored.

2 Wiring Centre Model: UH4 3

 UH4 Wiring

Connections H/W Manifold Pump/Valve Fuses

Mains Supply This output is used to control a hot water valve via a cylinder Used for an underfloor heating manifold pump and or valve. Fuse 1. 5amp, 20mm anti-surge fuse, this fuse supplies
thermostat power to all 230v outputs from the board it protects the zone,
Power supply into the UH4 which should be fused at 5 amps these Connections are clearly marked
L = Live pump/valve outputs.
connections are marked L = Live
E = Earth
L = live or phase 230v AC 50/60Hz E = Earth
N = Neutral
N = Neutral N = Neutral
Gr = Grey
E = Earth When an under-floor heating zone sends a call for heat to the UH4, the
Or = Orange
live & neutral output will supply 230v to the manifold pump/valve.
Heat Enable The auxiliary wires of the valve, usually grey & orange, are wired to the
Gr & Or terminals. It is recommended that this is fed through a high limit switch placed
This is the main call for heat for the system, there are 3 connections;
on the heating manifold, to protect against mechanical failure of the
LS = Live Supply Zones 1…4 manifolds temperature control.
E = Earth
Zones outputs are clearly marked
LR = Live Return
L = live out to actuator or valve
Electrically this is a volt free switch, whatever supply is placed on the
N = neutral to actuator or valve
LS connection, is fed to the LR connection when there is a call for heat.
There are two connections live (L) and neutral (N), both terminals
marked L are the same and both terminals marked N are the same.
Each zone output corresponds to the thermostat wired in at the
top of the pcb.

4 Wiring Centre Model: UH4 5

 BOILER ENABLE

UFH UFH UFH RADIATOR TIMER

Wiring UH4 – UH4 to neoStat – 3 x Underfloor Heating, NEO STAT NEO STAT NEO STAT NEO STAT NEO STAT
1 x Radiator zone & Hot Water.
L N A1 A2 - R T 1 R T 2 L N A1 A2 - R T 1 R T 2 L N A1 A2 - R T 1 R T 2 L N A1 A2 - R T 1 R T 2 L N A1 A2 - R T 1 R T 2

THREE CORE AND

UFM UNDER FLOOR MANIFOLD EARTH 1.5 CABLE

LIVE MAINS
SUPPLY

SWITCH LIVE
5A FUSE NO
ZONE 4 MANIFOLD PUMP CONTROL SWITCH
NEUTRAL MAINS L E N SL L E N SL L E N SL L E N SL L E N SL
SELECT YES FOR UNDERFLOOR HEATING
L E N
POWER BOILER ZONE 1 ZONE 2 ZONE 3 ZONE 4 HOT WATER AND NO FOR ALL OTHER SYSTEMS
EARTH YES

HEAT ENABLE MANIFOLD PUMP ZONE 1 ZONE 2 ZONE 3 ZONE 4 HOT WATER VALVE NOTE
END SWITCH AND LS E LR
OR VALVE
L E N L L N N L L N N L L N N L L N N L E N GR OR THE HOT-WATER VALVE LIVE FEED MUST BE
CONNECTED THROUGH THE CYLINDER HIGH
BOILER ENABLE LIMIT THERMOSTAT
LS AND LR IS
VOLT FREE
UFH UFH UFH RADIATOR TIMER
LN LN LN

BOILER
ENABLE
ZONE 1 ZONE 2 NEO ZONE
STAT 2
RADIATOR
NEO STAT NEO STAT NEO STAT NEO STAT
UFH VALVE HOT WATER VALVE
This equipment should be installed by an appropriately ACTUATORS ACTUATORS ACTUATORS VALVE
qualified/registered electrician. 230V 230V 230V HOT WATER STAT
VALVE WITH
Fully read the instructions for proper wiring before applying power. ENDSWITCH
The warranty does not cover damage from improper wiring
or installation. UFH PUMP L N A1 A2 - R T 1 R T 2 L N A1 A2 - R T 1 R T 2 L N A1 A2 - R T 1 R T 2 L N A1 A2 - R T 1 R T 2 L N A1 A2 - R

6 Wiring Centre Model: UH4 7

 UFH UFH UFH HEATING HOT WATER
Ratings
UH4 – Heatmiser 230v Thermostat Wiring Number of Heating Zones 4
DS1 SLIMLINE TOUCH NEOSTAT SMART STAT
Number of Hot Water Zones 1
Neon Indication Y
L N A 1 A2 - R T A2 A 1 N L - RT A 1 A2 N L RT2 RT1 - A2 A1 N L - RT2 RT1 N L NO NC COM
DIN Rail Mounting Y
Supply 230v AC 50Hz 1 Phase
Relay Load Max 3 Amp Resistive

THREE CORE AND Total Load Max 5 Amp Resistive

UFM UNDER FLOOR MANIFOLD EARTH 1.5 CABLE IP Protection IP20
Installed Dimensions (L,H,D) 384 x 148 x 60mm
LIVE Weight 800g
MAINS
SUPPLY
SWITCH LIVE

NEUTRAL 5A FUSE NO
MAINS L E N SL L E N SL L E N SL L E N SL L E N SL
ZONE 4 MANIFOLD PUMP CONTROL SWITCH
L E N SELECT YES FOR UNDERFLOOR HEATING
POWER BOILER ZONE 1 ZONE 2 ZONE 3 ZONE 4 HOT WATER AND NO FOR ALL OTHER SYSTEMS
EARTH YES

ZONE 1 ZONE 2 ZONE 3 ZONE 4 HOT WATER VALVE NOTE

HEAT ENABLE MANIFOLD PUMP

END SWITCH AND LS E LR

OR VALVE
L E N L L N N L L N N L L N N L L N N L E N GR OR
THE HOT-WATER VALVE LIVE FEED MUST BE
CONNECTED THROUGH THE CYLINDER HIGH
BOILER ENABLE LIMIT THERMOSTAT

LS AND LR IS
VOLT FREE
UFH UFH UFH RADIATOR TIMER
LN LN LN

BOILER
ENABLE
ZONE 1 ZONE 2 ZONE 2
NEO STAT NEO STAT NEO STAT NEO STAT NEO STAT
RADIATOR HOT WATER VALVE
This equipment should be installed by an appropriately VALVE
ACTUATORS ACTUATORS ACTUATORS
qualified/registered electrician. 230V 230V 230V
Fully read the instructions for proper wiring before applying power. VALVE WITH HOT WATER STAT
ENDSWITCH

The warranty does not cover damage from improper wiring UFH PUMP
or installation. L N A1 A2 - R T 1 R T 2 L N A1 A2 - R T 1 R T 2 L N A1 A2 - R T 1 R T 2 L N A1 A2 - R T 1 R T 2 L N A1 A2 - R T 1 R T 2

8 Wiring Centre Model: UH4 9

 System Configuration PLEASE COMPLETE DURING INSTALLATION Notes
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UH4 Title: ............................................................................................................................................................................................................................................................................................................................................

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In Use Zone Type Zone Title
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Under-Floor Radiator
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Zone 1 ............................................................................................................................................................................................................................................................................................................................................

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Zone 2 ............................................................................................................................................................................................................................................................................................................................................

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Zone 3
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Zone 4
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Hot Water
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10 Wiring Centre Model: UH4 11

Want More Information?
Call our support team on: +44 (0)1254 669090
Or view technical specifications directly on our website:
www.heatmiser.com

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Products Commonly used with the UH4 wiring centre.

Slimline NeoStat Touch SmartStat DS-1

Rev 1.0