26
7
Fig. 8
Principal Dimensions
5.2
ELECTRICAL
5.2.1
Mains.
a.
The heater is supplied with mains cable (PVC sheathed, heat resisting to 85
o
C), 3-core Brown-Blue-Green/Yellow,
6A, 0.75mm
2
), connected to a terminal block and exiting through the heater at the right hand top front. The cable
is suitable for a 230V 50Hz supply and shall be connected to the fixed wiring using a double pole switched,
fused spur, incorporating a protective earth link. The fuse fitted shall be rated 5A to BS 1362. Connections shall
be in accordance with the current edition of I.E.E Regulations BS 7671.
b.
MODAIRFLOW Models: An electronic control (Thermista-stat) is supplied which acts as a room thermostat.
c.
Non-MODAIRFLOW models: A 24V room thermostat (not supplied), that complies with BS 800, BS 3955 and BS
4201 is essential to ensure close control of comfort conditions. An anticipator is located within the thermostat
and is graded in amps. The anticipator should be checked and adjusted to 0.2A.
5.2.2
Thermista-stat/Room Thermostat and its location.
a.
The Thermista-stat/Room Thermostat should be located where there is free air circulation approx. 1.5m (5ft) from
the floor.
b.
Avoid the following locations:-
i)
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 affected by warm air ducts, diffusers, waste pipes or the heater itself.
iv)
Where subject to vibration.
c.
For MODAIRFLOW models, connect Thermista-stat wires to control panel terminals ‘4’ and ‘5’ (see Fig. 5a and
6a), connection polarity being important, cve side on control panel to +ve side on Thermista- stat.
d.
For non-MODAIRFLOW models, connect room thermostat wires control panel terminals ‘16’ and ‘17’
5.3
GAS
(SEE BS 5864 AND BS 6891)
5.3.1
An independent gas supply pipe from the meter is to be preferred wherever possible. When 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 this 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).
5.3.2
The
1
/
2
in 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 that it is durable, substantial and gas tight. To assist in determining whether
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 to a Rc
1
/
2
(
1
/
2
in BSP. external [taper] thread).
5.4
DRAUGHT DIVERTER & DEFELCTOR PLATE:
5.4.1
The HI-SPEC J50 heater is supplied with a draught diverter which houses the TTB, and which requires fitting to the
rear of the heater prior to installation, using 6 x 4mm screws and lock washers (provided). Connect the TTB to the
terminal block situated on the rear upper left hand corner of the appliance.
5.4.2
The deflector plate prevents spillage from the draught diverter in the event of a leak between the air heater and the
base plemum and MUST be fitted as shown in fig 3 using the screws provided.
5.5
DEFLECTOR PLATE SAFETY CHECK:
In order to ensure that the deflector plate is preventing warm air from entering the draught diverter and therefore causing spillage, the
following test MUST be carried out BEFORE commissioning:
5.5.1
Turn on the power supply to the heater.
5.5.2
Set the summer airflow switch to “on”.
5.5.3
Using a smoke match, introduce smoke into the heat exchanger at the burner opening.
5.5.4
Ensure that the smoke is drawn into the heat exchanger and not blown back from the burner opening.
5.5.5
If smoke is blown back from the burner opening, check for air leaks between the heater and the base plenum,
paying particular attention to the rear of the heater directly beneath the draught diverter.
