JOHNSON CONTROLS
62
FORM 100.50-NOM12
ISSUE DATE: 04/02/2019
SECTION 5 – SEQUENCE OF OPERATION
TABLE 20 - CURRENT OPERATING MODE
CURRENT OPERATING MODE UNIT TYPE DESCRIPTION
Occ Standby ALL There is no demand for cooling, heating, or dehumidication
Occ Cooling VAV There is a demand for cooling
Occ Cooling Low SZVAV There is a demand for low cooling
Occ Cooling High SZVAV There is a demand for high cooling
Occ Cooling without Bypass FlexSys There is a demand for cooling
Occ Cooling with Bypass FlexSys There is a demand for cooling
Occ Heating VAV or FlexSys There is a demand for heating
Occ Heating Low SZVAV There is a demand for low heating
Occ Heating High SZVAV There is a demand for high heating
Unocc Standby ALL There is no demand for cooling, heating, or dehumidication
Unocc Cooling VAV or FlexSys There is a demand for cooling
Unocc Cooling Low SZVAV There is a demand for low cooling
Unocc Cooling High SZVAV There is a demand for high cooling
Unocc Heating VAV or FlexSys There is a demand for heating
Unocc Heating Low SZVAV There is a demand for low heating
Unocc Heating High SZVAV There is a demand for high heating
Comfort Ventilation Cooling SZVAV There is a demand for cooling
Comfort Ventilation Heating SZVAV There is a demand for heating
Morning Warm-Up ALL There is a demand for heating
Occ Dehumidication with Cooling VAV or SZVAV There is a demand for dehumidication
Occ Dehumidication Cool Low VAV or SZVAV There is a demand for low dehumidication
Occ Dehumidication Cool High VAV or SZVAV There is a demand for high dehumidication
Unocc Dehumidication with Cooling VAV or SZVAV There is a demand for dehumidication
Unocc Dehumidication Cool Low VAV or SZVAV There is a demand for low dehumidication
Unocc Dehumidication Cool High VAV or SZVAV There is a demand for high dehumidication
SINGLE ZONE VAV (SZVAV)
• An HVAC system that has no VAV boxes installed
in the duct work operates as SZVAV.
• A SZVAV congured unit has a supply fan con-
trolled by a VFD that is capable of running at dif-
ferent speeds according to a cooling/heating de-
mand or supply fan only demand.
• Series 100 units ordered as SZVAV do not have a
duct static pressure transducer installed.
• SZVAV congured units do not have the ability to
control duct static pressure and have no high duct
static pressure protection.
• SZVAV units can be controlled by either a stan-
dard thermostat (staged) input or a zone tempera-
ture input.
SZVAV Setup
• Unit type must be set to SZVAV in the OPTIONS-
UNIT DATA menu.
• Zone control method must be set in the PRO-
GRAM-UNIT DATA menu.
• Single zone VAV minimum VFD speed must be
set in the SETPOINTS-SUPPLY SYSTEM menu.
• Unit design airow must be set in the SET-
POINTS-UNIT DATA menu.
• Occ zone cooling setpoint must be set in the SET-
POINTS-COOLING menu (zone control method
is Wired or Comm Zone Temperature).
• 1st and 2nd stage cooling setpoints must be set in
the SETPOINTS-COOLING menu.