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18
ADJUSTING AND SETTING THE BOILER
Before carrying out any adjusting of the burner, carefully read this complete chapter.
The initial lighting of the appliance must be performed by a licensed Gas Technician. Failure
to follow these instructions may result in property damage, serious injury or death.
As soon as the appliance has been fully installed (with regard to hydraulics, filling and de-
aeration of installation, gas, flue gas, air intake, wiring etc.) according to the preliminary
WARNING
installation instructions, the boiler may then be wired to an electrically grounded power supply
source. The boiler must always be connected to a disconnect or external power shutoff. The
boiler must be electrically bonded to the ground in accordance with the requirements of the
local authority having jurisdiction or, in the absence of such requirements, the National
Electrical Code, ANSI/NFPA 70, and or/the Canadian Electrical Code Part I, CSA C22.1
Electrical Code.
Introduction
The boiler must always be adjusted in the next situations:
- A new boiler is installed
- As part of a service/maintenance check, in case the CO
- The gas valve has been (re)placed.
- Gas conversion to propane. Prior to adjustments, follow the procedure in 18.4
- The venturi has been replaced. Prior to adjustments, follow the procedure in 18.3
- The fan has been replaced
- The flue gas check valve has been replaced
In any of the cases described, always check the gas/air ratio of the combustion figure (CO
minimum input. First set the boiler at maximum load and subsequently at minimum load, and repeat if necessary
(adjustments at maximum load influence values at minimum load and vice versa).
Chapter overview:
First, all necessary values are given in adjustment table 18.1. A drawing of the gas valve(s) and setting screws is
given in § 18.1.2. In § 18.2 a general procedure, conform which the adjustments must be carried out, is presented.
§ 18.3 describes the specific adjustments to be made when the venturi is replaced, and § 18.4 describes the
changes needed when the gas type is set to propane.
18.1.1 C
OMBUSTION TABLE
Table 1: CO
values for maximum and minimum load.
2
gas type
natural gas
VGH 299 CH, VGH 399 CH,
2)3)
propane
VGH 299 CH, VGH 399 CH,
1) All values measured without front door.
2) For propane: a conversion kit (orifice) has to be mounted, see 18.4.
3) For propane: appliance type must be changed, see 18.4
Table 18. 1
boiler type
VGH 500 CH
VGH 500 CH
E93.1601EN032.C VGH installation manual
values turns out to be incorrect.
2
1)
CO
/ O
[%]
2
2
High Fire
9.2 / 4.7
10.4 / 5.0
) at maximum and
2
CO
/ O
[%]
2
2
Low Fire
9.8 / 3.7
11.0 / 4.1
101
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