13
Maintenance Tables —
The bypass controller contains
the following maintenance tables, Bypass Controller Mainte-
nance Table (BP_MAINT), Bypass Controller Commissioning
Maintenance Table (BPCOMMIS), and Bypass Controller Sys-
tem Pilot Default Maintenance (SP_MAINT).
BYPASS CONTROLLER MAINTENANCE TABLE —
See Table 6 for Bypass Controller Maintenance Table
(BP_MAINT).
System Mode — This variable displays the master zone con-
troller’s system mode as the bypass controller’s system mode
except when the bypass controller is in its commissioning
mode or the network communication fails. In bypass commis-
sioning mode, the system mode will display
BPCOMMIS
to
indicate the bypass controller is in its own commissioning
mode. If the network communication between the bypass
controller and the master zone controller fails, the system mode
will display
LOCAL
.
System Mode:
Display Units
ASCII
Display Range
HEATING, COOLING,
FREE COOL,
PRESSURE,
EVAC, ZONE_BAL,
OFF, BPCOMMIS,
LOCAL
Forcible
No
Damper Position — This variable displays the damper posi-
tion percent range of rotation determined by the damper feed-
back potentiometer. The bypass controller is designed for use
on dampers with a range of rotation up to 90 degrees.
Damper
Position:
Display Units
% open
Display Range
0 to 100
Forcible
No
System Pressure Setpt — This variable displays the supply air
static pressure set point that is to be maintained by the bypass
controller. The bypass controller determines the damper posi-
tion by comparing the system static pressure to this set point.
System Pressure
Setpoint:
Display Units
in. wg
Display Range
0.10 to 1.80
Forcible
No
LAT Exceeds Limit — This variable displays whether the
leaving air temperature exceeds the heating or cooling limit
configured in the Bypass Controller Service Configuration
Table. If
Yes
is displayed, the System Pressure Set Point is
increased by the value in LAT Pressure Delta. This will cause
the amount of bypassed air to be reduced, thus protecting the
air source from receiving air that is too hot or too cool. If No is
displayed, then no LAT protection is in effect.
LAT Exceeds
Limit:
Default Value
No
Display Range
Yes/No
Forcible
No
LAT Pressure Delta — This variable displays the amount of
in. wg by which the System Pressure Set Point will be in-
creased if LAT Exceeds Limit displays Yes.
LAT Pressure
Delta:
Display Units
in. wg
Display Range
0.00 to 1.00
Forcible
No
System Pressure — This variable displays the static system
pressure through an integrated pressure sensor in increments of
0.1 in. wg.
System Pressure: Display Units
in. wg
Display Range
0.00 to 2.00
Forcible
No
Duct Temperature — This variable displays the duct tempera-
ture at the bypass damper through a 10K thermistor with a
measurement range from –40 to 245 F in 0.1° F increments.
Duct
Temperature:
Display Units
F (C)
Display Range
–40.0 to 245.0
Forcible
Yes
Clear Alarms — This variable displays the commanded state
of the Clear Alarms function. If this decision is forced to
Yes
,
all alarms in the Alarm History Table will be cleared and this
decision will automatically be set back to
No
.
Clear
Alarms:
Default Value
No
Display Range
Yes/No
Forcible
Yes
Table 6 — Maintenance
DESCRIPTION
VALUE
UNITS
STATUS
FORCE
NAME
System Mode
BPCOMMIS
SYS_MODE
Damper Position
58
%OPEN
DMP_POS
System Pressure Setpt
1.50
in H2O
SP_SETPT
LAT Exceeds Limit
No
LAT_ALRM
LAT Pressure Delta
0.00
in H2O
DELTA_SP
System Pressure
0.00
in H2O
SP_SENSR
Duct Temperature
73.8
dF
DUCT_TMP
Clear Alarms
No
CLR_ALRM
Summary of Contents for VVT 33ZC
Page 3: ...3 Fig 2 Bypass Controller Dimensions Fig 1 Bypass Controller Details...
Page 7: ...7 Fig 7 High Torque Actuator Wiring...
Page 8: ...8 Fig 8 High Torque Actuator with Linked Dampers Wiring...
Page 9: ...9 Fig 9 Field Supplied Linked Damper Wiring...
Page 10: ...10 Fig 10 Multiple Field Supplied Linked Damper Wiring...
