Eco-King HWB-299, Инструкция по установке и обслуживанию

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E93.1801EN171 HWB installation manual 77
13.7.1 F
LAME DETECTION
When the water heater is firing, and the flame is not detected anymore, the gas valve will be closed, and the control
will perform a post-purge, after which a restart will take place.
The presence of a flame is measured through the flame rod that points into the flame. The flame current is measured
by the control as ionization in micro amps (
μA
).
When the flame current is above Flamerod_Se Flamerod_Hysterese (1.0
μ
A + 0.5
μ
A) a flame will be pre-
sent. When the flame current is below Flamerod_Setpoint (1.0
μ
A) the flame will not be present.
13.7.2 F
LAME RECOVERY
When the ionization current is too low, the system responds by increasing the minimal fan speed, in order to keep
the flame present. This is done by increasing the minimal fan speed when the ionization current is too low.
Whenever the ionization current is high enough, the minimal fan speed will be decreased again. When the flame
still disappears the minimal fan speed will be increased for the next burn cycle.
• When the flame current is below Flamerod_Se Flamerod_Delta (1.0
μ
A + 0.2
μ
A) the minimal fan speed
will be increased.
• When the flame current is above Flamerod_Se Flamerod Flamerod_Delta * 2 (1.0
μ
A + 0.2
μ
A +
0.4
μ
A) the minimal fan speed will be decreased.
When the flame still disappears the minimal fan speed will be increased for the next burn cycle.
When the system successfully completes a burn cycle, the minimal fan speed will be reset to the set minimal fan
speed in the system.
Demand for Domestic Hot Water
13.8.1 DHW S
TORAGE WITH BULB SENSOR
; DHW
MODE
1
Select DHW mode 1 if cascading of water heaters is required this can be done by changing parameter (35) DHW
mode from 4 to 1. Default setting is DHW mode 4.
DHW Mode 1 is used for cascading water heaters set the cascade parameters according to paragraph “
15 cas-
cade “ Connect the Depending water heater and the managing water heater. Attach the strap on sensor (system
sensor) to the combined supply of the water heaters and connect this to the managing water heater, also connect
the DHW sensor which measures the temperature in the tank to the managing boiler.
The DHW temperature in the tank is measured with sensor T_Store and set with parameter (115) DHW_Store_Set-
point. When this sensor drops below DHW_Store_Setpoint minus (36) DHW_Store_Hyst_Down the control detects
a demand for the store and starts the DHW circulator.
If the supply temperature T_Supply is below
(115) DHW_Store_Setpoint plus (38) DHW_Store_Supply_Extra minus DHW_Supp_Hyst_Down the boiler is
started as well.
Factory set: 140⁰F + 0⁰F
-
9⁰F = 131⁰F (60⁰C + 0⁰C
-
5⁰C = 55⁰C)
(38) DHW_Store_Supply_Extra this parameter is default set to 0 F because the supply temperature of the water
is almost the same as the tank temperature.
When one of the water heaters in the cascade is ON, the power is PID-modulated so T_System is regulated
towards the DHW_Setpoint plus DHW_Store_Supply_Extra.
The water heater is stopped when the supply temperature rises above
DHW_Store_Setpoint plus DHW_Store_Supply_Extra plus (37) DHW_Supp_Hyst_Up.
Factory set: 1
40⁰F + 0⁰F + 7.2⁰F = 147.2F (60C + 0C + 4 = 64C)
The demand for the tank is ended when the tank-sensor rises above
DHW_Store_Setpoint plus DHW_Store_Hyst_Up. The circulator continues DHW_Post_Pump_Period.
Factory set: 140⁰F + 7.2⁰F = 147.2⁰F (60C + 4C =
64C)
No. of flame losses Description
0 Minimal fan speed as set in the system
1 In between minimal and ignition fan speed
2 Ignition fan speed