Pump Mode; Pump Blocking Time; Autom. Anti-Cycle Mode; Stor. Tank Therm - Worcester ZSBR 7-28 ICS1 Service Booklet

Boiler service functions

2.7 Autom. anti-cycle mode

If an outside-temperature controlled programmer is con-
nected to the appliance, the anti-cycle time is adjusted
automatically.
Automatic adjustment of the anti-cycle time can be dis-
abled. This may be necessary in the case of unfavoura-
bly dimensioned heating systems.
If automatic adjustment of the anti-cycle time is disa-
bled, the length of the anti-cycle time must be set under
service function 2.4.
B If automatic adjustment of the anti-cycle time has
been disabled, this should be entered on the com-
missioning record enclosed with the appliance.
2.9 Actual output
The actual output of the appliance at the time viewed is
displayed.
3.0 Fan speed
The current fan speed is displayed.
3.3 Ionisation current
The burner flame is monitored by measuring the ionisa-
tion current generated during combustion. If no ionisa-
tion current is detected, the gas valve shuts off. This
ensures that unburned gas does not escape.
3.4 Pump mode (ZBR.. models only)
The possible settings are:
• Pump mode 1: if a heating pump and a 3-way valve
for charging the heat store are connected.
The 3-way valve is de-energised when the heat store
circuit is open.
• Pump mode 2 (factory setting): if a circulation
pump and a heat store charging pump are con-
nected. In ECO mode, if the circulation pump and the
heat store charging pump call for heat simultane-
ously, the system alternates between 12 minutes
heating and 12 minutes hot water.
• Pump mode 3: if a circulation pump and a heat store
charging pump are connected. In ECO mode, if the
circulation pump and the heat store charging pump
call for heat at the same time, both pumps run simul-
taneously. The heat store charging temperature has
priority (up to 85 °C). The hydraulic configuration
must be matched to this pump mode (use of a mixer
unit and hydraulic balancing).
B The pump mode setting should be entered on the
commissioning record enclosed with the appliance.
10

3.5 Pump blocking time

(ZBR.. models only)
Only applies if service function 3.4, Pump
i
mode, is set to Pump mode 1 (external 3-
way valve for heat store charging is con-
nected). Otherwise has no function.
If the system incorporates a 3-way valve external to the
appliance, the heating pump is disabled while the 3-way
valve is being actuated. therefore, the blocking time of
the heating pump should be ≥ the actuation time of the
3-way valve.
The blocking time has an adjustment range of 0 to 16,
with each increment equivalent to 15 seconds. The
adjustment range therefore equates to 0 to 240 sec-
onds.
Factory setting is 30 seconds.
B Enter the pump blocking time on the commissioning
record enclosed with the appliance.
3.6 Software version
The version number of the software is displayed.
3.9 Jumper 8 - 9 /
3.9 Jumper Ls - Lr
When supplied, the appliance has a jumper fitted
across terminals 8-9 (= Heat demand). If that connec-
tion is opened (e.g. by a limiter for an underfloor heating
system), heating mode is disabled.
When supplied, the appliance has a jumper fitted
across terminals Ls-Lr (= Heat demand). If that connec-
tion is opened (e.g. by an external 2-point programmer),
heating mode is disabled.

4.0 Stor. tank therm. (7 - 9)

When supplied, the appliance has no jumper across ter-
minals 7- 9 (= Disabled). If that connection is closed
(e.g. by a heat store thermostat) heat store charging is
enabled.
4.1 Room therm. LSM/ 4.1 LSM release
When supplied, a jumper is fitted across terminals LZ -
L1 on the LSM (= Heat demand). If that connection is
opened (e.g. by a connected room thermostat), heating
mode is disabled.
LSM release shows the total number of all possible ena-
ble signals connected via the LSM. As soon as a mod-
ule connected to it (e.g. mechanical limiter for
underfloor heating, limit switch on flue flap, combustion
air flap, etc.) shuts off, heating and hot water modes are
disabled.
4.2 Timer ch. 1 (heating)/ 4.2 Timer ch. 2
(hot water)
Shows the status of channel 1 of the timer integrated in
the text display module or the separate programmer.
If that channel's status is "Heat demand", heating mode
will be activated according to the programmer com-
mands.
7 181 465 347 (01.07)