HAWK MASTER PANEL Lead/Lag for Up to Eight Boilers System HAWK — LEAD/LAG FOR UP TO EIGHT BOILERS SYSTEM Provides Lead/Lag control for up to eight boilers when used in conjunction with the HAWK integrated boiler control system. FEATURES AND BENEFITS Controls Header Pressure and Temperature: • Maintains steam pressure or hot water supply temperature based on system load demand. • Compensates for varying losses between boiler and header. Benefits: • Maximizes system efficiency. • Reduces cycling and boiler wear, thereby reducing maintenance and downtime costs. • System shall be provided with a sequence to automatically rotate sequence in which the boilers are fired. Rotation shall be based on the elapsed time. • Optimizes fuel savings. Lead/Lag Start with Lead/Lag Modulation: • Lead boiler operates at full capacity prior to starting lag boiler #1. • Lag boiler #1 starts when the lead boiler’s firing rate is close to the maximum. Operator can select this parameter via HMI. • Lag boiler #1 starts modulation when the lead boiler reaches the maximum firing rate position. • Subsequent lag boilers operate in the same fashion. • Ideal for steam boilers. Lead/Lag Start with Unison Modulation: • Lead boiler operates at full capacity prior to starting the lag boiler. • All boilers operate at the same firing rate as the lead boiler. • Ideal for Hot Water boiler systems. Section D-1 Rev. 09-09

HAWK MASTER PANEL Lead/Lag for Up to Eight Boilers System PRODUCT OFFERING Cleaver-Brooks shall supply the following equipment: • Boiler control for each boiler shall be the HAWK. • Pressure (Steam) or temperature (Hot Water) transmitter shipped loose for mounting in the common header. • Master Control Panel shipped loose for field mounting. • Requires Ethernet/IP Communication Option Section D-2 Rev. 09-09

HAWK MASTER PANEL Lead/Lag for Up to Eight Boilers System SAMPLE SPECIFICATIONS HAWK — LEAD/LAG FOR UP TO EIGHT BOILERS SYSTEM PART 1 1.1 GENERAL GENERAL A. Lead/Lag Start with either Lead/Lag or Unison Modulation. B. Boilers’ Start and Stop 1. Steam pressure, or hot water temperature on hot water systems, is compared with the setpoint and controller’s processor executes PID algorithm. Lead boiler is commanded to come on-line first. Lag boiler #1 is commanded to come online when a firing rate signal for the lead boiler reaches lag boiler start point. Lag boiler #1 is commanded to stop when a...

HAWK MASTER PANEL Lead/Lag for Up to Eight Boilers System 5. Header steam pressure or water temperature on hot water systems 6. Setpoint 7. Elapsed time from last rotation C. Selection 1. Number of boilers 2. Sequence of firing 3. Automatic or manual rotation 4. Individual boiler start and stop points with timers 5. Setpoint 6. Proportional, integral and derivative gains for control algorithm 1.3 APPLICATION AND SYSTEM REQUIREMENTS A. This option is applicable to full modulation burners utilizing the HAWK advanced boiler control system and modulating controls. B. Logic for Lead/Lag control shall...