Gulfstream GS A-Class 12/OV, Design, Installation & Servicing Instructions

Supplied By www.heating spares.co  Tel. 0161 620 6677

Page 35

GULFSTREAM

A-CL

ASS

(b) To remove the actuator press in (forward) the latch mechanism to the centre 

rear of the actuator.  At the same time press the actuator towards the body of 
the valve and turn the actuator counter clockwise (to the left) by 45 degrees (1/8 
turn).  Pull the actuator away from the body.

(c)  Replace the actuator and reassemble in reverse order.

7.29   3-WAY DIVERTER VALVE BODY 
(a)  Any faults with the valve itself are overcome by replacing the removable internal 

cartridge.

(b) Other than due to a faulty casting/leaking joint there should be no need to replace 

the valve body itself.

(c)  Instructions for replacing the cartridge and the necessary removal tool are all 

provided with the replacement cartridge.

(d) Before replacing the cartridge isolate the appliance from the heating system.
(e)  With the SP model open the safety valve to release any internal pressure and 

isolate the cold supply at the quarter turn valve on the inlet to the CA valve.

(f)  With the OV model shut off the servicing valve on the cold inlet to the ball-valve 

in the F & E cistern in both cases then drain down the boiler to below the level 
of the 3-way valve. 

(g) Remove  the  actuator  following  the  instructions  above  and  then  remove  the 

cartridge using the special tool provided.

(h)  Replace if necessary the cartridge and reassemble in reverse order.
(i)  UNDERTAKE WATER SOUNDNESS CHECK.
(j)  Check boiler/controls operation. 

7.30   ELECTRICAL CONTACTOR (Figure 6.5)
(a)  Release the wires from the terminals on both sides of the 25 amp contactor.
(b) Insert a 4mm slotted head screwdriver into the release tab below the contactor 

and push down.

(c)  Pull the contactor upwards and lift off the mounting rail.
(d) Replace and reassemble in reverse order ensuring the tab clips back into position 

and all wiring connections are tight.

(e)  Check boiler/controls operation.

7.31   M.C.B. – REMOVAL
(a)  Release the wires from the terminals on both sides of the MCB and remove the 

bus bar from the inlet (bottom).

(b) Insert a 4mm slotted head screwdriver into the release tab below the MCB and 

push down.

(c)  Pull the MCB upwards and lift off from the mounting rail.
(d) Replace and reassemble in reverse order ensuring the tab clips back into position 

and all wiring connections are tight.

(e)  Check boiler/controls operation.

Figure 6.4 Diverter Valve Actuator

Figure 6.5 25A Contactor

SERVICING AND CHANGING COMPONENTS

Latch mechanism

Pull out

latch