Instruction manual

McQuay OM 920 19
Keypad/Display Menu Structure
SAF Ctrl is an adjustable parameter used to select how the supply fan is to be controlled. The
supply fan can be controlled by supply air fan by duct pressure or by a percentage of supply
air fan speed from 25% to 100%. The speed option is typically used with a building
automation system.
Remote SF Cap is an adjustable item for setting the supply fan speed by the keypad or by a
network control signal.
Return/Exhaust Fan Speed Menu
RF/EF Speed a status only item that indicates the current return/exhaust fan VFD speed.
Speed Cmd is a status only item that indicates the current return/exhaust fan VFD
commanded speed.
Min Speed is a status only item that indicates the minimum return/exhaust fan VFD speed.
Bldg Press is a status only item which indicates the building static pressure at the building
static pressure sensor location.
BldgSP Spt is an adjustable item which sets the building static pressure set point used for
controlling the VFD for the return/exhaust air fan. The VFD is modulated to maintain the
building pressure at this value.
RF/EF CP Ctrl is an adjustable parameter used to select how the return/exhaust fans are to be
controlled. The exhaust fans can be controlled by the building pressure or by a percentage of
return/exhaust air fan speed from 25% to 100%. The speed option is typically used with a
building automation system.
Remote RAF Cap is an adjustable item for setting the return fan speed by the keypad or by a
network control signal.
Remote EF Cap is an adjustable item for setting the exhaust fan speed by the keypad or by a
network control signal.
Table 9: Return/Exhaust Fan Speed Menu
Menu Display Name Item Display Name Default Setting Range Password Level
RF/EF Spd Control RF/EF Speed= - 0-100% 6
Speed Cmd= - 0-100% 6
Min Speed = 5% 0-100% 6
Bldg Press= - -0.25-0.25in 6
BldgSP Spt= 0.050in -0.25-0.25in 6
RF/EF Ctrl= Tracking None 6
Tracking
BldgP
Speed
Rem RAF Cap= 5% 0-100% 6
Rem ExhF Cap= 5% 0-100% 6