503220
15
Zoom out
Zoom in
Previous page
1/100
Next page
Instruction manual BFC 15
gis
2.3 Water heater
operating cycle
The temperature sensor T
1
(7) measures the water temperature at the top of the
water heater T
top
). This temperature is sent to the controller. As soon as T
1
is
lower than the set water temperature (T
set
), the controller registers a "heat
demand". The fan (18) starts running and the gas control valve (16) is opened.
The fan runs at full speed and the gas is mixed with the air in the venturi (30).
This mixture is ignited by the hot surface igniter (20) and the water becomes
heated. As soon as the water temperature approaches T
set
the fan rpm drops
to the partial load speed (this is also referred to as modulating). Once T
1
rises
above T
set
, the heat demand ends and the controller stops the operating cycle.
When responding to both the start and end of the heat demand, the controller
assumes a certain margin. We refer to this margin as the
hysteresis (12.2 "
Setting the hysteresis").
2.4 Protection for the
water heater
2.4.1 Introduction
The controller monitors the water temperature and ensures safe combustion.
This takes place using:
the Protection for the water heater
;
the Gas control valve;
•the Fan
the Pressure switch;
the Flame probe.
2.4.2 Water temperature protection
Using temperature sensors T
1
(7) and T
2
(13), the controller monitors three
temperatures that are important for safety. The table explains the functioning of
the temperature sensors.
Temperature protection
2.4.3 Gas control valve
The controller opens the gas control valve so that gas can be supplied to the
burner. As a safety measure, the gas control valve has two valves. Both valves
shut off the gas supply.
2.4.4 Fan
The fan (18) provides an optimum air supply when there is a heat demand. As
a safety feature, the fan ensures that any gases present in the combustion
chamber are removed, both before and after combustion. We refer to this as
pre- and post-purge.
The fan speed is continuously monitored by the controller (4). The controller
takes control if the fan rpm varies too much from the value set.
Safety Description
Anti-frost
(T
1
< 5°C or T
2
< 5°C)
The frost protection cuts in. The water is heated to 20°C.
Maximum water temperature:
(T
1
> 88°C or T
2
> 88°C)
The high-limit safeguard serves to prevent overheating and/or excessive
formation of scale in the appliance. If the high-limit safeguard is activated,
heating is stopped. This causes the water in the tank to cool down. Once the
water has cooled sufficiently (T
1
< 81°C), the controller resets the appliance.
For extra safety
(T
1
> 93°C or T
2
> 93°C)
A lockout error of the water heater controller takes place. The controller must
be manually reset before the appliance can resume operation (8.3 "Error
conditions"). The reset may only be performed if T
1
< 81°C.
15


Need help? Post your question in this forum.

Forumrules


Report abuse

Libble takes abuse of its services very seriously. We're committed to dealing with such abuse according to the laws in your country of residence. When you submit a report, we'll investigate it and take the appropriate action. We'll get back to you only if we require additional details or have more information to share.

Product:

For example, Anti-Semitic content, racist content, or material that could result in a violent physical act.

For example, a credit card number, a personal identification number, or an unlisted home address. Note that email addresses and full names are not considered private information.

Forumrules

To achieve meaningful questions, we apply the following rules:

Register

Register getting emails for A.O. Smith BFC100 at:


You will receive an email to register for one or both of the options.


Get your user manual by e-mail

Enter your email address to receive the manual of A.O. Smith BFC100 in the language / languages: English as an attachment in your email.

The manual is 3,04 mb in size.

 

You will receive the manual in your email within minutes. If you have not received an email, then probably have entered the wrong email address or your mailbox is too full. In addition, it may be that your ISP may have a maximum size for emails to receive.

Others manual(s) of A.O. Smith BFC100

A.O. Smith BFC100 Usermanual and installation guide - German - 100 pages

A.O. Smith BFC100 User Manual - Dutch - 116 pages

A.O. Smith BFC100 Manual - Dutch - 2 pages


The manual is sent by email. Check your email

If you have not received an email with the manual within fifteen minutes, it may be that you have a entered a wrong email address or that your ISP has set a maximum size to receive email that is smaller than the size of the manual.

The email address you have provided is not correct.

Please check the email address and correct it.

Your question is posted on this page

Would you like to receive an email when new answers and questions are posted? Please enter your email address.



Info