Hamworthy DORCHESTER DR90L-CE, Инструкция по установке, наладке и обслуживанию

Страница: 7 / 14

HAMWORTHY HEATING LTD. APPENDIX 4 500001029/C
3
Unscrew the retaining screw securing the din
plug/s in place and carefully pull the plug/s
away from the valve or separate the plug and
socket in line connector near the control box.
Disconnect the flame probe and electrode
leads by pulling off the ceramic cap from the
flame probe and the rubber cap from the
spark electrode.
The gas train assembly is secured to the
heater by two nuts on the front feet and screw
in the bottom of the heater casing at the
centre of the gas manifold. Removal of these
enables the assembly to be withdrawn.
The electrode and flame probe should be
checked for cracked ceramics and wear.
Replace as necessary and adjust to correct
gaps. For servicing of the burners and the
internals of the heater, refer to the main
installers guide, with the exception of the pilot
burner which is not fitted to the automatic
version.
Reassemble components in reverse order,
taking care to replace the rubber sealing ring
in the union.
FAULT FINDING
1. Heater will not start, controller not
locked out:-
Check continuity across control thermostat
with control at operating temperature
position.
Check for high temperature limit thermostat
lockout.
2. Heater starts but controller goes to
lockout without ignition:-
Check gas valve operation (by pressure at
manifold test point during a start up attempt).
Check ignition electrode connector (wire is
firmly screwed into ceramic connector) and
ignition transformer if no spark is produced.
3. Heater starts, ignition occurs, controller
immediately goes to lockout:-
DR35-90L
Check flame probe connector (wire is firmly
screwed into ceramic connector).
Check flame probe position ie touching the
burner bar or not in the flame will cause a
lockout (see Fig 5 for correct probe position).
DR70-90L
Reduce flame ignition time by adjusting the
main valve initial opening. Remove the
protective cap from the top of the valve (see
Fig 4), reverse it and use to turn the spindle
exposed. This adjusts the rapid initial
opening of the valve and thus the initial gas
pressure. The valve is initially set at the
minimum opening position, turn counter-
clockwise to increase the opening. Restart
the heater and replace protective cap.
Replace control box. NOTE! To remove
control box from its base, using a screwdriver
remove the retaining screw in the front of the
box and gently pull from the base. Locate
and press home the new one and retighten
screw.
ADDITIONAL RECOMMENDED SPARES
Description Part Numbe r
Control Valve
3
/
4
Dungs 533903013
Compact Gas Control Valve
23 mm in/out Honeywell
VR4601A (special)
531907008
Limit Thermostat 533901191
Controller 533901006
Ignition transformer 533901062
Electrode (ignition) 533805008
Probe (Flame Sensing) 533805007
Ceramic Cap (Probe) 533901060
Rubber Cap (Electrode) 533901255