Johnson & Starley HI-SPEC J50, Installation, Commissioning & Servicing Instructions

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DEFECT IS OPEN CIRCUIT
IN THERMISTA-STAT
INSTALLATION WIRING
DOES
BURNER
STAY
LIT?
Y
REPLACE
THERMISTA-STAT
BRIDGE TERMINALS AT
THERMISTA-STAT
Y
IS
POLARITY
OK ?
N
RECTIFY
CHECK THERMISTA-STAT
CONNECTIONS POLARITIES
Y
REPLACE
ELECTRONIC MODULE
N
DOES
BURNER
STAY
LIT?
BRIDGE THERMISTA-STAT AT
HEATER
Y
SET THERMISTA-STAT
TO MAX
IS
THERMISTA-
STAT
SET TO
MAX ?
N
N
MAIN BURNER ONLY FIRES FOR SHORT PERIODS
8.5 PILOT BURNER, THERMOCOUPLE AND ELECTRODE, REMOVAL AND REPLACEMENT:
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 Disconnect the Thermocouple from the Thermocouple adapter on the Multifunctional Control, taking care to avoid
damage to the thermocouple capillary.
8.5.4 Release the Pilot Feed Pipe from the Multifunctional Control.
8.5.5 Remove 2 x 4mm screws securing the Pilot Burner assembly to the Burner and Control assembly, and withdraw the Pilot
Burner Assembly.
8.5.6 Release the Thermocouple securing nut from the Pilot Burner assembly and withdraw the Thermocouple, taking care to
avoid damaging the Thermocouple capillary.
8.5.7 Release the Electrode securing nut from the Pilot Burner assembly and withdraw the Electrode.
8.5.8 Release the Pilot Feed Pipe securing nut from the Pilot burner assembly and withdraw the Pilot Feed Pipe and Pilot
Injector from the Pilot Burner assembly, and disconnect the Pilot Injector from the Pilot Feed Pipe hook.
8.5.9 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 (including the adapter), 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 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 230V connections (L/N/E) from the Fan Assembly.
8.8.4 Release 4 x screws securing the control panel, and withdraw the panel, avoiding damage to wiring.
8.8.5 Release 2 x Fan Assembly securing screws and withdraw the Fan Assembly from the Heater cabinet, avoiding damage
to fan blades.
8.8.6 Remove all dust from the impeller and motor, avoiding damage to the fan blades.
8.8.7 Refitting or replacement is in reverse order.
8.9 ELECTRICAL ASSEMBLY 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 2 x 4mm screws securing the Limit switch cover and the withdraw cover.
8.9.4 Release the Electrical Assembly cable clamp,
MODAIRFLOW models:
8.9.5 Disconnect the following:
a. Disconnect 230V connections (L/N/E) from Fan Assembly,
b. 230V mains ‘ L ’, ‘ N ’ and ‘ E ’ from connection block terminals ‘ 1 ’, ‘ 3 ’ and ‘ 2 ’ respectively,
c. Thermista-stat connections from connection block terminals ‘ 4 ’ (+ve) and ‘ 5 ’ (-ve),
d. Limit Switch ‘ LOAD ’ and ‘ COMMON ’ connections,
e. 2 x Airflow sensor connections,