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Project Name / Date Division 23 52 33.13 - 4
powder coat which is suitable for outdoor installation, applied prior to assembly for complete
coverage, and shall incorporate louvers in the outer panels to divert air past heated surfaces.
2. The boiler(s), if located on a combustible floor, shall not require a separate combustible floor
base.
3. The boiler(s) shall have the option of venting the flue products either through the top or the
back of the unit.
4. Combustion air intake shall be on the left side of the cabinet, right side optional.
L. Boiler Operating Controls
1. The boiler(s) shall feature an optional four-stage digital controller with adjustable outdoor
reset, mounted and wired.
2. Water and air temperature sensors shall be shipped loose for field installation by installing
contractor.
Specifier Note: The remaining items in this section are options. Delete those that are not being
specified. IMPORTANT: The Cold Water Start and Cold Water Run Systems cannot be
used on the same boiler. The Low Gas Supply Pressure and FlexGas Manifolds also
cannot be used on the same boiler.
M. Boiler Pump - Refer to Equipment Schedule
N. SureRack™ Boiler Stacking Kit
1. The boilers shall be stacked directly one on top of the other, without offset, to minimize
footprint.
O. Cold Water Start System
1. The boiler(s) shall be configured with a cold water start automatic proportional bypass system
that ensures the boiler will experience inlet temperatures in excess of 120ºF in less than 7
minutes to avoid damaging condensation. The unit will automatically shut down if the inlet
temperature is not achieved within the 7 minute time frame.
2. The cold water start system shall be configured with a modulating three-way valve that is
controlled by a system-matched PID controller. The PID controller temperature sensor shall be
located in the inlet header of the boiler.
3. The control shall have a temperature setting dial located on the face of the board. The
temperature range of the dial shall be 105ºF to 120ºF. The PID Logic shall be capable of
limiting system overshoot to a maximum of 10ºF on initial start-up or call-for-heat.
4. The cold water start system shall be completely wired and mounted at the factory.
5. The control shall have the following diagnostic LED’s:
a. Call for heat
b. Start-up mode
c. Inlet temperature error
d. Sensor out of range
6. The controller shall have alarm contacts.
P. Cold Water Run System
1. The boiler(s) shall be configured with a cold water run automatic proportional bypass system
that ensures the boiler will experience inlet temperatures in excess of 120ºF in less than 7
minutes to avoid damaging condensation. The unit will automatically shut down if the inlet
temperature is not achieved within the 7 minute time frame.
2. The cold water run system shall be configured with a variable speed pump that is controlled by
a system-matched PID control that injects the correct amount of cold water directly into the
boiler loop to maintain a minimum inlet temperature. The PID controller temperature sensor
shall be located in the inlet header of the boiler.
3. The control shall have a temperature setting dial located on the face of the board. The
temperature range of the dial shall be 105ºF to 120ºF. The PID Logic shall be capable of
limiting system overshoot to a maximum of 10ºF on initial start-up or call-for-heat.
4. The cold water start system shall be completely wired and mounted at the factory.
5. The control shall have the following diagnostic LED’s:
a. Call for heat
b. Start-up mode