Slant/Fin VHG-100-CH, Installation And Service Manual

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E93.1901EN032 Installation and Service Manual SlantFin VGH-CH / CO
129
17 ADJUSTING AND SETTING THE BOILER
Before carrying out any adjustments of the burner, carefully read this chapter entirely.
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
installation instructions, the boiler should 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 following situations:
•
A new boiler has been installed.
•
As part of a service/maintenance check, in case the CO
2
values turn out to be incorrect .
•
The gas valve has been replaced .
•
Gas conversion to propane. Prior to adjustments, follow the procedure in 17.3.
•
The venturi/gasvalve has been replaced. Prior to adjustments, follow the procedure in 17.3
•
The fan has been replaced.
In any of the cases described, always check the gas/air ratio of the combustion figure (CO
2
) at maximum and
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 17.1. A drawing of the gas valve(s) and setting screws is
given in paragraph 17.1.2. In paragraph 17.2 a general procedure, conformably to which the adjustments must be
carried out, is presented. Paragraph 17.3 describes the specific adjustments to be made when the gasvalve/venturi
is replaced, and paragraph 4 describes the changes needed when the gas type is set to propane.
C
OMBUSTION TABLE
Table 1: CO
2
and O
2
values for high fire and low fire for all boiler types.
1)
CO
2
flue gas
Natural gas
High Fire %
9.1 – 8.4
Low Fire %
9.4 – 8.9
Propane
2)3)
High Fire %
10.1
Low Fire %
9.8
O
2
flue gas
Natural gas
High Fire %
4.6 – 6.0
Low Fire %
4.1 – 5.0
Propane
2)3)
High Fire % 5.5
Low Fire % 6.0
1) All values measured without front door.
2) For propane: the gasvalve/venturi must be completely replaced, see 17.3.
3) For propane: appliance type must be changed, see 17.3.
Table 17.1
WARNING