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LAARS Pennant PNCV (Sizes 500-2000) - Install and Operating Manual User Manual

Page 45

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Pennant

(500-2000)

Page 45

Figure 31. Typical Gas Train Configuration.

Figure 32. Typical Control Panel.

DSGN temperature is the water temperature required

to heat the boiler zones when the outdoor air is as cold

as the OUTDR DSGN temperature.

Warm Weather Shut Down (WWSD) – When

the outdoor air temperature rises above the WWSD

setting, the control turns on the WWSD segment

in the display. When the control is in WWSD,

the Dem segment is displayed if there is a heat

demand. However, the control does not operate the

heating system to satisfy this demand. The control

does respond to a setpoint demand and operates as

described in the Reset Override section (next).

Reset Override (SETPOINT DEMAND) – This

is used when override of the outdoor reset curve is

needed, such as when an indirect water heater is served

by the heating system. A setpoint demand is required

whenever heat is required for the setpoint load. The

setpoint demand overrides the reset water temperature.

The control turns on the Setp Dem pointer in the

display. The control energizes the pump (on pump-

mounted boilers), energizes the Pmp-Pmp terminals,

and turns on the boiler pump segment in the display.

The control then operates the boiler stages to maintain

the programmed boiler target temperature. The reset

override operation is not affected by WWSD.

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