Gulfstream GS A-Class 12/OV, Инструкции по проектированию, установке и обслуживанию

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Page 33
GULFSTREAM
A-CL
ASS
7.10 SAFETY I.E. PRESSURE RELIEF VALVE (‘-SS’ MODEL ONLY)
(a) Isolate the appliance from the heating system.
(b) Isolate the cold supply to the primary system/appliance at the quarter turn valve
on the inlet to the CA valve assembly.
(c) Open the safety valve to release any internal pressure. Drain down the boiler to
below the level of the safety valve.
(d) Operate the valve once more to remove residual water and disconnect the
capillary of the pressure gauge from the valve using a 14mm AF spanner.
(e) Disconnect the valve inlet and discharge pipe nuts using a 22mm AF spanner
and remove the valve.
(f) If necessary exchange the valve and re-assemble in reverse order.
(g) Refill the boiler ensuring all air is removed.
(h) UNDERTAKE WATER SOUNDNESS TEST.
(i) When full allow the appliance to reach full temperature and check the valve is
water tight.
(j) Check boiler/controls operation.
7.11 EXPANSION VESSEL (‘-SS’ MODEL ONLY)
(a) Isolate the appliance from the heating system.
(b) Isolate the cold supply to the primary system/appliance at the quarter turn valve
on the inlet to the CA valve assembly.
(c) Open the safety valve to release any internal pressure.
(d) Drain down the boiler to below the level of the safety valve.
(e) Remove all residual water possible through safety valve discharge.
(f) Disconnect the flexible pipe from the top of the expansion vessel using a 30mm
spanner and pull the vessel upwards and to the left out of its recess. DO NOT
MISPLACE THE SEALING WASHER.
(g) Exchange the vessel if required and re-assemble in reverse order.
(h) Check the air pressure is set at 1.0 bar at the Schrader valve provided on the top
of the expansion vessel.
(i) Refill the boiler ensuring all air is removed.
(j) UNDERTAKE WATER SOUNDNESS TEST.
(k) Check boiler/controls operation.
7.12 FASCIA MOUNTED BURNER CONTROL PCB
(a) Undo the 2 slotted screws and drop down the hinged fascia panel.
(b) Remove terminal/block plugs (3) and spade connector from the pcb.
(c) Undo the 4 x 5mm plastic securing nuts and remove the PCB.
(d) Disconnect the earth lead from the pcb.
(e) Replace if necessary and re-assemble in reverse order ensuring the terminal
blocks are pushed fully home.
(f) Replace any severed cable ties.
(g) Check and ensure the jumper positions are correct (See instructions supplied
with the part)
(h) Check boiler/controls operation.
7.13 MAIN ‘ACB’ PCB
(a) Remove the terminal/block plugs (8) at the edge of the PCB.
(b) Gently ease the PCB off its supports (8).
(c) Replace if necessary and re-assemble in reverse order.
(d) Ensure ‘A’ parameter for appliance type is correctly set (see table 5.2)
(e) Check boiler/controls operation.
7.14 COLD WATER SENSOR
(a) Isolate and drain down as necessary the hot/cold water system.
(b) Remove the electrical connector from the thermistor.
(c) Unscrew using a 15mm AF spanner and remove the thermistor.
(d) Replace if necessary and reassemble in reverse order making a watertight seal
using PTFE tape.
(e) Refill cold water system.
(f) UNDERTAKE WATER SOUNDNESS TEST.
(g) Check boiler/controls operation.
7.15 DHW SENSOR
(a) Isolate and drain down as necessary the
hot/cold water system.
(b) Remove the electrical connector from the
thermistor.
(c) Unscrew using a 15mm AF spanner and
remove the thermistor.
(d) Replace if necessary and reassemble in
reverse order making a watertight seal using
PTFE tape.
(e) Refill cold water system.
(f) UNDERTAKE WATER SOUNDNESS TEST.
(g) Check boiler/controls operation.
7.16 STORE SENSOR
(a) Remove the thermistor from its pocket and
disconnect from the plug.
(b) Replace if necessary and re-assemble in
reverse order ensuring the thermistor is
pushed fully into its pocket.
(c) Check boiler/controls operation.
7.17 BOILER RETURN SENSOR
See 7.20.
7.18 PLATE HEAT EXCHANGER (PHE)
(a) Isolate the boiler from the heating system.
(b) Isolate the incoming stop valve and drain
down the hot/cold water system.
(c) With the SP model open the safety valve to
release any internal pressure.
(d) Drain down the boiler to below the level of
the PHE.
(e) Disconnect the union connectors (4) at the
corners of the plate heat exchanger using
a 29mm AF spanner and remove the plate.
Note: It is easier to remove the 2 front nuts
and adjacent pipework to get access to the
back 2 nuts.
(f) When draining the plate heat exchanger
take precautions against standing water in
the pipework and the heat exchanger.
(g) Replace if necessary and re-assemble in
reverse order.
(h) NOTE: Replace the sealing washers at each
connection during re-assembly.
(i) Undertake water soundness test.
(j) Check boiler/controls operation.
7.19 ELECTRIC BOILER (SWITCH)
(a) Isolate the boiler from the heating system.
(b) Isolate the cold supply to the appliance at
the servicing valve to the F & E cistern of the
OV model and at the quarter turn valve on
the inlet to the CA valve if the SP model.
(c) With the SP model open the safety valve to
release any pressure.
(d) Drain down the boiler to below the level of
the electric boiler.
(e) Disconnect mains supply cables (4) to the
heater element from the bottom of the 2
relays.
SERVICING AND CHANGING COMPONENTS