58
16.4
STATUS DISPLAY SCREENS
Section
Display
Description
A (Boiler
status
bar)
STANDBY
The unit has not received a call for heat
START
The unit has received a call for heat and is checking all safety circuits
PREPURGE
The unit has received a call for heat and has initiated a pre-purge period
IGNITION
The unit has initiated the spark ignition to the main burner
%
The unit has fired and is running at the displayed firing rate
POSTPURGE
The call for heat has ended, the unit runs the fan for a set period to purge the
combustion chamber and vent the system of additional flue products
SHUTDOWN
The unit is in the OFF position
SETPOINT MET
The control temperature has exceeded the set point and offset
BLOCKED
The unit has detected a condition that has temporarily interrupted the call for
heat
B (Call
for heat
indicators
)
1
Room thermostat 1 has called for heat
2
Room thermostat 2 has called for heat
3
Room thermostat 3 has called for heat
DHW tank thermostat or sensor has called for heat
Indicates which room thermostat has priority
The unit is being controlled by a 0-10V BMS signal
The member unit is supplying heat whilst in Cascade mode
Section
Display
Description
C(Operational
Information)
DETAILS SCREEN 1
a.
SYSTEM TEMP
b.
TANK TEMP
c.
OUTDOOR TEMP
d.
INLET TEMP
e.
OUTLET TEMP
f.
DHW RECIRC TEMP temperature of DHW recirc sensor if fitted
DETAILS SCREEN 2
a.
DELTA T
b.
FLUE TEMP
c.
FLAME CURRENT
d.
FAN SPEED
e.
LOOP 1 TEMP
as reported by the MTLC control
f.
LOOP 2 TEMP
as reported by the MTLC control
g.
LOOP 3 TEMP
as reported by the MTLC control
I/O SCREEN
a.
GAS PRESSURE SW
b.
FLOW SW
c.
LOUVRE RELAY
d.
LOUVRE SW
e.
BLOCKED DRAIN
f.
GAS VALVE
Summary of Contents for HERALD HCB116CE
Page 8: ...8 3 1 2 PRINCIPLE PARTS TO BE USED IN CONJUNCTION WITH TABLE 3 1 1...
Page 31: ...31 Max distance between brackets...
Page 32: ...32...
Page 33: ...33...
Page 37: ...37...
Page 53: ...53 15 8 WIRING DIAGRAM 15 8 1 WIRING DIAGRAM...
Page 54: ...54 15 9 LADDER DIAGRAM 15 9 1 LADDER DIAGRAM...
Page 92: ...92...
