Southbend CQ-325S, Owner'S Manual

SERVICE INFORMATION 

SECTION 6:       

        MODELS: GC-2 & GC-3 

CABINET CONTROL PROBLEMS (con t' d )  

Boiler Slowdown Valve does not drain 

When the appliance is turned OFF, the Boiler Slowdown Valve 1s de-energized and consequently opens 
and the water contained in the Boiler being under pressure, should be blown through this Valve and be 
noticeably visible exhausting out the appliance Drain. However, if the blow down operation appears to 
function rather sluggishly or not at all, then assume that considerable sealant may be lodged in the drain 
pipe and/or the Valve. Disconnect the Valve from the drain line and inspect both the Valve and the drain 
pipe fixed to the Boiler. If considerable sealant or lime build up is apparent then not only the Valve but also 
the Boiler and Water Level Control must be thoroughly cleansed. Refer to Gas Boiler (below) on Removal of 
Sealants etc. for procedure. 

Gas Boiler achieves pressure slower than normal 

If the Boiler requires considerably more time than 20 minutes to achieve normal operating pressure (9-12 
p.s.i.), then assume that heavy build up of sealant has completely coated the interior of the Boiler and 
consequently heat transfer is hampered by the insulating effect of the sealant. Unbolt and remove the Hand 
hole Cover Plate and Gasket assembly. Examine interior of Boiler for sealant and/or lime build up. 

If considerable sealant is evident then the Boiler Blow down Valve (similar to Exhaust Solenoid 
Valve) must also be examined. Refer to page 17 on cleaning procedure. 

Removal of sealants 

Disconnect all (3) union pipe fittings and hot water tilt connection to Boiler. Cap and seal all 4 opened 
connections to Boiler. 

Plumbed directly to the Boiler drain pipe is a pipe Tee with a plug which must be removed and 
replaced with a convenient length of pipe to provide drainage into a suitable receptacle placed in 
front of the appliance. 

With hose through Hand hole, flush out all loose sealants allowing them to drain through Boiler drain 
pipe (into receptacle).  If drain pipe is clogged with sealant and unable to drain, ream open with a 
suitable tool such as screwdriver or long rod from inside of Boiler and through drain pipe Tee. With wire 
brush, loosen as much sealant as possible and flush out of Boiler. 

Plug drain pipe. Prepare a solution of one part Muriatic (Hydrochloric) Acid to seven parts of water and pour 
into Boiler through Handhole up to Handhole opening level and allow to stand for several hours or overnight. 
Unplug drain pipe and allow solution and sealants to drain out. During this procedure, exercise extreme care 
to avoid personally coming in contact with acid. If contact occurs, wash acid off immediately with clean 
water. 

Remove all caps and reconnect all unions and connections to Boiler. 

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