Protherm 100 User Instructions - page 24
24
Combined gas armature Honeywell CVI-M
A - Cover
B - Maximum adjustment screw
C - Minimum adjustment screw
1 - Inlet pressure testpoint
2 - Burner pressure testpoint
Protherm 100 e - Conversion to LPG
•
Isolate boiler from the gas and electrical supplies.
•
Remove boiler casing and combustion chamber cover as described
in Installation/Servicing Instructions.
•
Disconnect flame sense electrode.
•
Disconnect ignition lead at gas valve module.
•
Disconnect ignition earth lead.
•
Undo nuts securing gas supply pipe between burner and
gas valve and remove pipe.
•
Unscrew two screws securing burner to base of
sealed chamber.
•
Pull main burner up and forward out of boiler.
Note:
The washer between the burner and burner gas
supply must be kept to use in reassembly.
•
Fit new burner with marked injector diameter
∅
∅
∅
∅
∅
0,73
mm to the boiler in reverse order to removal.
•
Readjust the gas valve.
Gas Valve Adjustment
To adjust the minimum and maximum settings, proceed as follows:
•
Gain access to the rear of the controls housing
•
Remove the PCB cover
•
Connect a manometer to the burner pressure test point (2) on the gas valve
•
Turn potentiometer TR1, on the PCB, fully anti-clockwise
•
Start boiler in Central Heating mode
•
Adjust the gas valve minimum pressure
Pmin
using screw (C) on gas valve. Turn clockwise to increase,
anti-clockwise to decrease.
•
Turn potentiometer TR1, on the PCB, fully clockwise
•
Start boiler in Domestic Hot Water mode
•
Adjust gas valve maximum pressure
Pmax
using screw (B). Turn clockwise to increase, anti-clockwise
to decrease
Note:
It is first necessary to remove cover (A) to gain access to screw (B)
•
If necessary, run boiler in Central Heating mode and adjust the range rating to suit the size of the heating sys-
tem using potentiometer TR1. Refer to commissioning in Installation/Servicing Instructions
•
Disconnect manometer and check for gas soundness
•
Replace all covers in reverse order to removal
Inj. diam
Pmin
Pmax
G20 (20 mbar)
∅
1,20 mm
2 mbar
15 mbar
G30 (30 mbar)
∅
0,73 mm
4 mbar
29 mbar
G31 (37 mbar)
∅
0,73 mm
4 mbar
36 mbar