Utica Boilers MGB Series II/MGC Series インストール手順

20

Thermostat actuates on call for heat, 

completing circuit to control. Completed 

circuit to control will first activate circulator 

and damper which will close end switch inside 

damper. Completes circuit to ignition system, 

ignition takes place.
In event boiler water temperature exceeds 

high limit setting on boiler mounted high limit 

control, power is interrupted between control 

system and ignition system. Power remains 

off until boiler water temperature drops below 

high limit setting. Circulator continues to 

operate under this condition until thermostat is 

satisfied. 
In event flow of combustion products through 

boiler venting system becomes blocked, blocked 

vent safety switch shuts main burner gas off. 

Similarly, if boiler flue-way becomes blocked, 

flame rollout safety switch shuts main burner 

gas off.  Figure 16.  If either of these conditions 

occur, DO NOT ATTEMPT TO PLACE BOILER 

Blocked Vent 

Safety Switch

Rollout Switch 

4 Section Boiler

Rollout Switch                        

2,3,5                    

Section Boiler

Intergral Draft 

Hood

Base

Burner 

Door

Burners

Orifices

Jacket Base 

Panel

Before seasonal start-up, have a certified service agency 

check boiler for soot and scale in flues, clean burners and 

check gas input rate to maintain high operating efficiency.

Label all wires prior to disconnection when servicing 

controls. Wiring errors could cause improper and 

dangerous operation.

  

Verify proper operation after servicing
Service agency will verify system is filled with water to 

minimum pressure and open air vents, if used, to expel any 

air accumulated in the system. Check entire piping system 

and, if any leaks appear, have them repaired.
Circulators need to be checked and maintained. 

Refer to circulator manufacturer's instructions.
Inspect venting system at the start of each heating 

season. Check vent pipe from boiler to chimney for signs of 

deterioration by rust or sagging joints. Repair if necessary. 

Remove vent pipe at base of chimney or flue and using a 

mirror, check vent for obstruction and verify vent is in good 

working order.
Boiler flue gas passageways may be inspected by a light 

and mirror. Remove burner door. Figure 17. Place trouble 

lamp in flue collector through draft relief opening. With 

mirror positioned above burners, flue gas passageways can 

be checked for soot or scale.

This procedure should be followed to clean flue gas 

passageways:

Remove burners from combustion chamber by raising 

burners up from manifold orifices and pulling toward 

front of boiler. Figure 19.

Disconnect vent pipe from draft hood.

Remove top jacket panel.

Remove combination flue collector and draft hood from 

boiler castings by loosening nuts on hold down bolts 

located on each side of collector. Figure 17.

Place sheet of heavy paper or similar material over 

bottom of base and brush down flue passageways. Soot 

and scale will collect on paper and is easily removed 

with the paper. 

With paper still in place in base, clean top of boiler 

castings of boiler putty or silicone used to seal between 

castings and flue collector. Verify chips are not lodged 

in flue passageways.

When cleaning process is complete, restore boiler 

components to their original position. Use IS-808 GE 

silicone (available from distributor) to seal around flue 

collector and boiler castings.