6
Based on the above settings, the zone logic will automatically set unit # 1 and unit # 2 as ONbyZM
(On by Zone Master). Unit # 3 will be STBbyZM (Standby by Zone Master). Unit # 4 will be OFF-
byZM (Off by Zone Master)
Typical Screen (values for reference only):
Units that are set to OFF by the Zone Master do not rotate. Auto rotation start time can be set to
OFF for no rotation or to any hour during the day for rotation. Rotation can be programmed to oc-
cur every 8, 12, 24 hours or day of the week.
Assume 24 hours rotation, on the status page of each unit the following will be displayed:
Unit Number 1
Unit Number 2
Unit Number 3
Unit Number 4
Day 1
ONbyZM
ONbyZM
STBbyZM
Off
Day 2
STBbyZM
ONbyZM
ONbyZM
Off
Day 3
ONbyZM
STBbyZM
ONbyZM
Off
Day 4
ONbyZM
ONbyZM
STBbyZM
Off
Day 5
STBbyZM
ONbyZM
ONbyZM
Off
Day 6
ONbyZM
STBbyZM
ONbyZM
Off
Day 7
ONbyZM
ONbyZM
STBbyZM
Off
Note:
- If communication with the Zone Master is broken, all units will operate independently and
for the fi rst fi ve (5) minutes, the message will displayed at on each unit’s display screen:
“Master (U1) has Gone Offl ine”
- If communication between a slave unit (for example Unit #3) and the Zone Master is broken,
the Master will exclude Unit Number 3 from its calculation and report on its status loop:
“Unit 3 is Offl ine”
During this time, Unit Number 3 will operate independently on its own setpoints.
The auto Lead/Lag Standby Rotation Logic is enabled through the Zone Master (see Program-
ming and Selection section).
One unit is designated the Master (U1). Each individual unit may be set to OFF or STDBY (Stand-
by).
Zone Master
Note: U1 is the Master
Primary
Unit #1: ONbyZM
No
Alarm
Temperature: 73.5
o
Humidity: 48%
