Watts AERCO Benchmark BMK750 Operation And Service Manual page 28

Benchmark with Edge [I]: Operation-Maintenance Manual
SECTION 2: OPERATION
GOV Limit-5 – GOV Limit-15
Above 70F Val
Below 70F Val
No FFWD Above FR
No FFWD Feature
Menu → Advanced Setup → Performance → Fire Control
Main Menu → Advanced Setup → Performance → Fire Control → Purge Control
Purge Blower Voltage
Purge Timer
Post Purge Timer
Main Menu → Advanced Setup → Performance → Fire Control → Ignition Control
Ignition Position
Ignition Blower Voltage
Ignition Voltage Offset
Low Fire Timer
Ignition Hold Timer
IGN Time Setting
Main Menu → Advanced Setup → Performance → Fire Control → Operating Control
Start Valve Position
Stop Valve Position
Max Valve Position
Standby Blower Voltage
Air Compensation
Vlv Position Change Rate
Skip Range Cntr
Skip Range Span
Skip Speed
Main Menu → Advanced Setup → Performance → Fire Control → Anti-Cycling Control
On Delay
Slow Shutdown
OMM-0145_A99 • GF-218 •
Numeric Entry
Numeric Entry
Numeric Entry
Read Only
Read Only
Numeric Entry
Numeric Entry
Numeric Entry
Numeric Entry
Read Only
Numeric Entry
Numeric Entry
Numeric Entry
Read Only
Numeric Entry
Numeric Entry
Numeric Entry
Numeric Entry
Enable/Disabled
Numeric Entry
Numeric Entry
Numeric Entry
Numeric Entry
Numeric Entry
Enable/Disabled
Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST
9/18/2019
When the Outlet Temperature exceeds the Temperature
Hi Limit by 5 to 15°F, the effective Fire Rate will be
reduced by the value entered in GOV Limit-5 through GOV
Limit-15 (0 – 100°F).
If the inlet water temp is above 70F, algorithm adds offset
provided by this item to all the 11 breakpoints ("breakpoint
at 100" – "breakpoint at 0"). (-10 - +10°F)
If the inlet water temp is below 70F, algorithm adds offset
provided by this item to all the 11 breakpoints ("breakpoint
at 100" – "breakpoint at 0"). (-10 - +10°F)
No Feed Forward above this fire rate
No Feed Forward above fire rate feature status
Sets the blower speed (blower output voltage) during the
Purge cycle (2.0 to 10.0 V).
Allows adjustment of the pre-ignition purge time (5 to 60
sec.).
Allows adjustment of the post purge time before the unit
shuts down (0 to 60 sec.).
Sets the air fuel valve position at which the unit will operate
during the ignition sequence (5% to 60%).
Displays the actual blower voltage during ignition.
Allows an adjustment to the blower voltage during ignition
(-5.00 to 5.00).
Specifies how long to remain in the low fire position after
ignition, before going to the desired output (2 to 600 sec.).
Sets the length of time the unit stays in ignition position (0
to 60 sec.).
Displays the maximum time between confirmation of gas
valve opening (POC) and a stable flame detected.
Specifies the valve position at Start Level (0 to 40%).
Specifies the valve position at Stop Level (0 to 40%).
The maximum valve position for unit (40 to 100%).
Specifies the blower voltage in Standby Mode, during
which the blower motor remains "ON" at low speed, to limit
power cycles. AERCO recommends keeping the default,
however, may set this between 2.00 and 0 volts on
individually vented units in positive pressure mechanical
rooms to compensate (0.0 to 10.0V).
Innovation Only!
Defines the rate at which the valve position will progress
from one step to the next (0.5 to 60 sec.).
Together, these 3 parameters define an optional Fire Rate
the Controller will skip-over (Skip Range Cntr = the center
of the range). These can be used to reduce objectionable
noise at a certain Fire Rate, if there is no other remedy.
Sets the minimum time a unit must stay off after shutting
down or going into standby (0 to 600 sec.).
Enable/disable the slow shut down feature once Off Delay
threshold is achieved.
Page 28 of 157