Johnson & Starley ECONOMAIRE 90 Installation, Commissioning & Servicing Instructions Download Page 7

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5.4

ELECTRICAL

WARNING: THIS APPLIANCE MUST BE EARTHED!

5.4.1

Mains.

The heater is supplied with mains cable (PVC sheathed, heat resisting to 85

C), 3 core: Brown; Blue; Green/

Yellow, 6A, 0.75mm

), connected to a terminal block and exiting through the heater at the right hand top. The

cable is suitable for a 230V 50Hz supply and requires connection to the fixed wiring using a double pole
switched, fused spur with a contact separation of at least 3mm in ALL poles. The fuse fitted must be rated 5A
to BS 1362. Connections must also be in accordance with the current edition of I.E.E Regulations BS 7671.

NOTE:

If, for any reason, the heater is re-wired, then 3 core cable that meets the above specification MUST be used. Under
NO circumstances, should 5 core cable be used for the combined purpose of supplying power to the heater and
connecting the thermista-stat!

Fan delay and overheat (limit controls) are not adjustable and are factory set so that the limit switch opens at
93

C and closes at 76

An electronic controller (thermista-stat) is supplied which acts like a room thermostat.

5.4.2

Thermista-stat and its location.

The thermista-stat should be located where there is free air circulation and positioned approx. 1.5m (5ft) from
the floor.

Avoid the following locations:

In a room where temperature is greatly affected by the sun or any other heat source, e.g. radiant fire,
wall light fittings or TV set.

ii.

Near an outside door or windows, or on an outside wall.

iii.

Where it will be affected by warm air ducts, diffusers, waste pipes or the heater itself.

iv.

Where it will be subjected to vibration.

Connect the thermista-stat wires to terminals ‘8’ and ‘9’ on the terminal block (see Figs. 13 & 14).

5.5

GAS (SEE BS 5864 AND BS 6891)

5.5.1

The local gas supply conditions MUST be adequate for the specified burner pressures as stated in the technical
specification (para. 1.3)

5.5.2

An independent gas supply pipe from the meter is to be preferred wherever possible. Where this is not possible, the
pipe must be capable of taking the complete input of the heater and all other gas appliances being served by the
same pipe. This supply should be suitably sized to conform to British Standards requirements of no more than 1.0
mbar (0.4in wg) pressure drop (See table of discharge in BS 6891).

5.5.3

The 1/2in union gas cock (supplied) MUST be fitted to the gas inlet of the heater for easy isolation during servicing.
The gas pipe should be fitted and installed so as to be durable, substantial and gas tight. To assist in determining
where a gas connection may not be tight, a leak detection fluid should be applied around the connection. Under no
circumstances should a flame be used to locate a gas leak. Gas entry to the air heater is through either side or the
base, to a Rp1/2 (1/2in BSP. internal [parallel] thread). NB Sealing grommets are supplied for sealing around the gas
feed pipe.

AIR HEATER COMMISSIONING

6.1

PREPARATION:

After installation of the appliance, you MUST do the following:

6.1.1

Test for gas leakage using proprietary detection fluid and seal any leaks found.

6.1.2

Carry out preliminary electrical system checks.

6.1.3

Ensure that:

filter, fan and fan compartments are free from obstructions.

all registers or grilles are open and conform to design specifications.