Table of Contents
Advertisement
20 ADJUSTING AND SETTING THE WATER HEATER
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 or serious injury.
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
water heater may then be wired to an electrically grounded power supply source. The water heater should
always be connected to a disconnect or external power shut off and must be electrically bonded to the
ground according to all applicable standards and regulations.
Introduction
The water heater must always be adjusted in the next situations:
- A new water heater is installed
- As part of a service/maintenance check, in case the O
- The gas valve has been (re)placed.
- Gas conversion to propane. Prior to adjustments, follow the procedure in 19.5
- The venturi has been replaced. Prior to adjustments, follow the procedure in 19.4
- 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 (O
mum input. First set the water heater at maximum load and subsequently at minimum load, and repeat if neces-
sary (adjustments at maximum load influence values at minimum load and vice versa).
Chapter overview:
First, all necessary values are given in adjustment table in § 19.1.1. A drawing of the gas valve(s) and setting
screws is given in § 19.1.2. In § 19.2 a general procedure, conform which the adjustments must be carried out, is
presented. § 19.3 describes the specific adjustments to be made when the venturi is replaced, and § 19.4 de-
scribes the changes needed when the gas type is set to propane.
C
20.1.1
OMBUSTION TABLE
Table: O
/ CO
values for maximum and minimum load.
2
2
Gas type:
Heater type
EFW 85
EFW 105
EFW 125
EFW 155
Allowed tolerances are O
1) All values measured without front door.
2) For propane: a conversion kit (orifice) has to be mounted, see § 19.4.
3) For propane: Parameter 92 and 93 (fan speed) must be changed, see § 19.4
110
O
/ CO
[%]
2
2
natural gas G20
max load
6.0 / 8.4
6.0 / 8.4
6.0 / 8.4
6.0 / 8.4
± 0.2 and CO
± 0.1
2
2
/ CO
values turn out to be incorrect.
2
2
1)
O
/ CO
2
propane G31
min load
max load
6.9 / 7.9
4.9 / 10.5
6.9 / 7.9
5.2 / 10.3
6.9 / 7.9
5.2 / 10.3
6.9 / 7.9
5.2 / 10.3
E93.1804.014
) at maximum and mini-
2
[%]
2
2) 3)
min load
6.7 / 9.3
6.7 / 9.3
6.4 / 9.5
6.4 / 9.5
Advertisement
Table of Contents
