5.2.2
Room Thermostat and its location.
a.
The 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.
c.
Connect room thermostat wires control panel terminals ‘5’ and ‘6’
5.3
GAS
(See BS 5864 and BS 6891)
5.3.1
An independent gas supply pipe 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 2.5 mbar (1.0 in wg)
pressure drop (see table of discharge in BS 5482).
5.3.2
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 so fitted and installed 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 to a
Rc1/2 (1/2in BSP. external [taper] thread).
6.
COMMISSIONING
6.1
PREPARATION:
6.1.1
Ensure that:
a.
Gas and Electrical supplies are
OFF
.
b.
Filter, fan and fan compartments are free from obstructions.
c.
All registers or grilles are open and conform to design specifications.
d.
Return, relief and ventilation air installations are adequate.
6.2
SYSTEM BALANCING:
6.2.1
Set the heater electrical supply ON.
6.2.2
Set the SUMMER AIR CIRCULATION switch to ‘
ON
’.
6.2.3
Balance the system to provide required volume proportions at warm air outlets.
NOTE:
If the system includes ceiling diffusers, air velocities through these should be NOT LESS THAN 1.5m/s (300ft/
min), except for very small rooms (ie. bathrooms etc.). Outlet faces may require partial blanking in order to achieve this.
6.2.4
Set the SUMMER AIR CIRCULATION switch to ‘
OFF
’.
6.3
IGNITION OF PILOT AND MAIN BURNERS:
WARNING:
If the pilot light is extinguished either intentionally or unintentionally, no attempt should be made to
relight the gas for a minimum of 3 minutes. Ensure that the Electrical supply, Time Control and Selector switches are set
to
‘OFF’
.
6.3.1
Set the Room Thermostat to its lowest or
OFF
setting.
6.3.2
On the Multifunctional Control, slacken the pressure test point screw, and fit a pressure test gauge (refer fig. 4).
6.3.3
Turn the heater Gas supply
ON
, test for gas soundness and purge the whole gas pipe as described in BS 6891.
6.3.4
Referring to Fig. 4, press and hold the OPERATING CONTROL, and whilst observing the Pilot Burner, repeatedly
press the Piezo igniter button until the Pilot Burner ignites.
6.3.5
After 20 seconds release the OPERATING CONTROL and let it spring out; ensure that the Pilot Burner remains
alight. If the Pilot Burner extinguishes, wait three minutes and repeat steps 6.3.4 and 6.3.5 until the Pilot Burner
remains alight.
6.3.6
Ensure that the pilot flame envelops the Thermocouple tip, adjusting the Multifunctional Control Pilot Adjuster as
required (refer Fig. 4).
6.3.7
Set the Heater Electricity supply
ON
.
6.3.8
Set the Time Control to required Heating On periods.
6.3.9
Set the Selector switch to ‘TIMED’.
ZZ1031/4
7
ZZ1031/4
12
8.5
PILOT BURNER ASSEMBLY, REMOVAL AND REPLACEMENTS:
8.5.1
Remove the Burner and Control Assembly as detailed in 8.2
8.5.2
Disconnect the Igniter lead from the Piezo unit.
8.5.3
Release the Thermocouple locking nuts from the Pilot Assembly and Multifunctional Control, and withdraw the
Thermocouple, taking care to avoid damaging the capillary.
8.5.4
Release the Pilot Feed Pipe from the Pilot Burner.
8.5.5
Remove the 2 x 4mm screws, locking washers and nuts securing the Pilot Burner Assembly to the Main Burner,
and withdraw the Pilot Burner Assembly.
8.5.6
Release and remove the 2 x 4mm screws securing the Igniter electrode to the Pilot Burner and withdraw the
electrode.
8.5.7
Refitting or replacement is in reverse order.
NOTE: When refitting or replacing Thermocouple, tighten only to FINGER TIGHT + 1 FLAT.
8.6
MULTIFUNCTIONAL CONTROL REMOVAL:
8.6.1
Remove the Burner and Control Assembly as detailed in 8.2
8.6.2
Disconnect the Thermocouple at the Multifunctional Control, avoiding damage to the capillary.
8.6.3
Disconnect the Pilot Feed Pipe from the Multifunctional Control.
8.6.4
Disconnect the Multifunctional Control input and output supply feeds.
8.6.5
Refitting or replacement is in reverse order.
8.7
PIEZO UNIT REMOVAL:
8.7.1
Disconnect the 2 x conductors from Piezo unit.
8.7.2
Unscrew the Piezo retaining nut and remove the unit from its mounting bracket.
8.7.3
Refitting or replacement is in reverse order.
8.8
AIR CIRCULATING FAN, REMOVAL AND CLEANING:
8.8.1
Ensure that the electrical supply is isolated.
8.8.2
Remove the appliance lower and upper doors.
8.8.3
Disconnect the Fan Assembly flying lead.
8.8.4
Remove the Fan Assembly securing screw and withdraw the Fan Assembly from the Heater cabinet, avoiding
damage to the fan blades.
8.8.5
Remove all dust from the impeller and motor, avoiding damage to the fan blades.
8.8.6
Refitting or replacement is in reverse order.
8.9
CONTROL PANEL REMOVAL:
8.9.1
Ensure that the electrical supply is isolated.
8.9.2
Remove the appliance lower and upper doors.
8.9.3
Release the 2 x 4mm screws securing the Limit Switch cover and withdraw the cover.
8.9.3
Disconnect the following:
a.
Fan Assembly flying lead,
b.
230V mains ‘
L
’, ‘
N
’ and ‘
E
’ from connection block terminals ‘1’ and ‘
3
’, and earth stud respectively,
c.
Room thermostat from connection block terminals ‘
5
and ‘
6
’,
d.
Limit Switch ‘
LOAD
’ and ‘
COMMON
’ connections,
e.
Fan Control ‘
LOAD
’, ‘
COMMON
’ and ‘
EARTH
’ connections,
f.
2 x Override-stat connectors (if fitted),
8.9.4
Disconnect the 2 x TTB connections.
8.9.5
Release the Multifunctional Control solenoid cover retaining screw, remove the solenoid cover and disconnect
the solenoid wiring.
8.9.6
Release the 4 x 4mm screws securing the Electrical Assembly to the heater cabinet and remove the Electrical
assembly.
8.9.7
Refitting or replacement is in reverse order.
