Store Heating - Active ('R' Models); Electric Backup - Benchmark mCHP BoilerMate Design, Installation And Servicing Instructions

2.0 SYSTEM DESCRIPTION
When both store and space heating demands are active and the average
store temperature is greater than 'T-CH_boost2_Off' set point and the rate
of temperature rise in the store is greater than the R_CH_boost 2 set point,
the controller will switch off the electric boost.
The store heating demand ceases when both store temperatures T5 and T6
are greater than S5_OFF and S6_OFF set points or if the programmer switches
off the 'hot water' demand.
When the store heating demand ceases,the controller will send the stop signal
to the mCHP unit and switch off the mCHP pump after the overrun period
determined by the mCHP appliance.
If the store temperature exceeds 95ºC when the store heating demand is
active,the controller will switch off all active sources and activate the overheat
safety trip lockout.
2.2.6 STORE HEATING 'R' MODELS SPACE
HEATING DEMAND ACTIVE
The store heating demand will only be accepted if either' hot water'or'space
heating' demand is switched on by the programmer.
When both store temperatures T5 and T6 measured by sensors S5 and S6 are
less than the S5_ON and S6_ON set points, the controller will send the run
command signal to the mCHP unit.
When both store and space heating demands are active and the average
store temperature is less than 'T_CH_boost1_On' set point and the rate of
temperature rise in the store is less than the R_CH_boost1 set point, the
controller will send the signal to the mCHP to run in boost mode.
When both store and space heating demands are active and the average
store temperature is greater than 'T_CH_ boost1_Off' set point and the rate
of temperature rise in the store is greater than the R_CH-boost1_' set point
the controller will send the signal to the mCHP to run in normal mode.
When both store and space heating demands are active and the average
store temperature is less than 'T_CH_boost2_On' set point and the rate of
temperature rise in the store is less than the R_CH_boost2 set point, the
controller will switch on the electric boost heater if enabled.
When both store and space heating demands are active and the average
store temperature is greater than 'T_CH boost2 OFF set point, and the rate
of temperature rise in the store is greater than the R_CH-boost 2 set point,
the controller will switch off the electric boost.
The store heating demand ceases when both store temperature T5 and T6 are
greater than S5_OFF and S6_OFF set points or if the programmer switches
off the 'hot water' demand.
When the store heating demand ceases, the controller will send the stop
signal to the mCHP unit.
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If the store temperature exceeds 95ºC
when the store heating demand is active,
the controller will switch off all active heat
sources and activate the overheat safety
trip lockout.
2.2.7 ELECTRIC BACK UP
FACILITY (MODEL'N'&'R')
The mCHP_BoilerMateA-CLASS models
are fitted with an electric backup facility. If
the mCHP unit does not supply heat when
requested and fails to heat the store, the
user has the option of selecting the electric
backup system until the mCHP appliance
operation is restored.
By moving the mode rocker on the front
panel from'normal'to'switch'position,the
electric backup boiler ie the 'switch' will
be selected and this will be indicated by
constantly lit red led on the front panel.
After the 'switch' backup system has
been selected it will operate the same as
the mCHP using the same set points as
discussed in previous sections and also
with same sensor error handling routines.
If the store temperature exceeds 95ºc the
controller will shut the heat source and
activate the overheat safety trip lockout,
the same as with a boiler.
The 'switch' backup system can be
deselected at any time by the user by
pressing the mode rocker back to 'normal'
position. This will be indicated by the red
LED on the front panel going off.
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