What type of cables are required for Heatmiser controls?  This depends on the wiring centre that has been selected.

230V UH3 wiring centre:

The UH3 board has 8 connections for 8 zones and 2 time clock inputs and it can be used with programmable thermostats, dial type thermostats and our setback thermostats.

It has volt-free boiler enable and outputs for the manifold pump and valve.

It is designed to work with 230v thermostats and actuators,  and zone 8 can be isolated for use with radiators or electric underfloor heating mats through a relay or contactor. It is normally mounted close to the manifold.

The UH3 wiring centre needs a 230v mains supply, and all connections must be made using mains rated cable.

The thermostat connections are L(live)  N(neutral)  1(time clock 1)  2(time clock 2)  SL(switched live).

The time clock connections are switched live outputs from the time clock which means that they can be used to control standard dial type thermostats, or our setback thermostats (DS SB).

Standard dial type thermostats3 core + earth cable

Standard dial type thermostats require live, neutral and switched live connections. 

Neutral and switched live will connect to N and SL respectively. 

The live connection can then be connected to L , 1 or 2.

Connecting it to L will mean the thermostat is always on, and connecting the thermostat to 1

will put it under the control of time clock 1, and connecting it to 2 will put it under the control of time clock 2.

For 2 wire thermostats ignore the neutral.

Setback Thermostats4core + earth

Our DS-SB thermostats need 4 connections L(live)  N(neutral)  CH(time clock)  SL(switched live ).

 L will connect to L, N to N, and SL to SL, the CH connection goes to connection 1 or 2.

Connecting the thermostat to 1 will put it under the control of time clock 1, and connecting it to 2 will put it under the control of time clock 2.

Unlike many thermostats the DS DB remains in setback mode until it gets a live signal on the CH input, which means it will control to 4 degrees below the dial setting, and can be used with almost any time clock.

Programmable Thermostats3 core + earth

Programmable thermostats will connect to Live, Neutral and SL on Heatmiser PRT and PRT-TS.

This will be L to L, N to N, A2 to SL , with a small link between L and A1 on the back of the thermostat.

Digital Thermostats4 core + earth

Our Digital thermostats will connect to Live, Neutral,  SL, and 1 or 2. 

This will be L to L, N to N, A2 to SL and A1 to 1 or 2 .

Connecting the thermostat to 1 will put it under the control of time clock 1 connecting,  it to 2 will put it under the control of time clock 2.

Time Clock 3 to 6 core + earth depending on the number of channels used.

The UH3 is designed to work with the TM4-TS 4 channel time clock but can work with our TM1 or any other time clock.

The time clock connections are L (live) N (neutral) 1,2,3,4 Connections 1 and 2 connect to the thermostat terminals 1 and 2, connections 3 and 4 are dummy terminals and don't connect to anything on the UH3 board, they are there to provide a convenient connection point for the 2 spare channels in the TM4, 3 is normally used for hot water. .

 

12V UH1 Wiring centre:

BELDEN 9538 cable

When using this cable make sure the shield drain wire (the silver unshielded wire ) is connected to earth at the UH1.

Using cat5-FTP cable on the Heatmiser Network

Generally cat5 cable come in 3 types, which are

1. CAT5-UTP unshielded

2. CAT5-FTP shielded lower cost

3. CAT5-STP shielded higher cost

For the heatmiser network you should use CAT5-FTP.

This is SHIELDED CAT5 OR CAT5E the FTP stands for foil screened twisted pair.

The network uses digital communications to talk between the thermostats and touchpad tr2 or netmonitor (+). This digital comms line needs to be protected from interference and the cat5- ftp does this in 2 ways:

1. The cable is shielded from outside interference

2. The cables are twisted around each other in pairs

Connect as follows :- Brown to + Brown/white to -Blue to B Blue/white to Y

Orange to A1 Orange/white to A2 Green to B1 Green/white to B2 (PRT/HW-N AND PRT/HW-NTS only)

Each set of connections forms a twisted pair in the cable cancelling out any interference to or from the cables.

If your cable colours are different, make sure you use a twisted pair for each of the following :-

1. + & -

2. A1 & A2

3. B1 & B2

4. Y & B

When using this cable make sure the shield drain wire (the silver unshielded wire ) is connected to earth at the UH1 end.

 

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