Technical Drawing

BURNHAM COMMERCIAL 27 February 2008
MPC Multiple Pass Commercial Boiler – Suggested Specifications
Heating, Ventilating and Air Conditioning
15500-4
c. (USE FOR LOW/HIGH/LOW OR FULL MODULATION) Firing rate control-
ler.
d. Dial type stack thermometer, minimum 3” dial face, ½” NPT connection.
e. ASME Section IV safety relief valve sized to exceed the gross output of the
boiler which shall be factory set to relieve pressure at (30) (50) (80) PSI water
working pressure.
f. One (1) low water cutoff device with manual reset, to comply with CSD-1 re-
quirements. Boiler shall be fitted with a probe type LWCO located above the
lowest safe permissible water level established by the boiler manufacturer.
LWCO shall be UL listed and FM approved, suitable for commercial hydronic
heating service at 80 PSI.
2.4 Sage Boiler Control (SBC™) Module
A Scope of Supply
Supply a boiler control system to provide safety interlocks and water temperature control. The con-
trol system shall be fully integrated into the burner control cabinet and incorporate single and multi-
ple boiler control logic, inputs, outputs and communication interfaces. The control system shall co-
ordinate the operation of up to eight (8) fully modulating hot water boilers and boiler pumps. The
control system shall simply control boiler modulation and on/off outputs based on the boiler water
supply temperature and an operator-adjusted setpoint. However, using parameter menu selections,
the control system shall allow the boiler to respond to remote system water temperature and outside
air temperatures with domestic hot water priority (DHWP) and warm weather shut down (WWSD) or
building automation system (BAS) firing rate demand, remote setpoint or remote start/stop com-
mands.
B Boiler Control
Using PID (proportional-integral-derivative) based control, the remote system water temperature
shall be compared with a setpoint to establish a target boiler firing rate. If the secondary loop GPM
is greater than the primary loop GPM, firing rate is increased in response to the decrease in secon-
dary loop temperature. When the remote system temperature is near the boiler high limit tempera-
ture, the boiler supply sensor shall limit the maximum boiler supply temperature to prevent boiler
high limit trips. Alternately, using parameter menu selections, the control system shall allow the
boiler to respond directly to boiler supply temperature and setpoint to establish a target boiler firing
rate while remote system water temperature is used for display purposes only. Each boiler’s fuel
flow control valve shall be mechanically linked to the air flow control device to assure an air rich
fuel/air ratio. All the automated logic required to ensure that pre-purge, post-purge, light-off, and
burner modulation shall be provided.
C Hot Water Temperature Setpoint
When the controller is in the local control mode, the control system shall establish the setpoint based
on outside air temperature and a reset function curve, or be manually adjusted by the operator. When