This template is used to control a two-pipe fresh air unit. The two operating modes it supports, heating in winter and cooling in summer, are selectable via "Winter_Summer Mode Select". Heating/Cooling Valve Control generates PID-calculated outputs based on the supply air temperature value and setpoint. Fault Alarm Protection includes individual sensor fault alarms, filter differential pressure switch and low limit temperature switch.

Legend

Description

Legend

Description

OAT

Outside Air Temperature

VLV

Valve

OAD

Outside Air Damper

SF

Supply Fan

FILT

FILTER

SAT

Supply Air Temperature

LLT

Low Limit Temperature