CBV-2U4-3T(-N) |
CBV-2U4-3T(-N) Control Sequences
©ABB 2022 All Rights Reserved.
Subject to change without notice
WWW.CYLON.COM
38
M
AN0
13
9
re
v
14
VAV MODULATING HOT WATER REHEAT SINGLE SPEED FAN
TEMPERATURE CONTROL
When the zone temperature is greater than, or equal to, the cooling temperature setpoint, the controller will
enter the cooling mode. The primary air flow rate will be varied between its
deadband setpoint, and its maximum Flowrate setpoint
(A211) as required to maintain
the zone at the cooling temperature setpoint.
When the zone temperature falls to the heating setpoint, the controller will enter the heating mode and the
primary air flow rate will be varied between its
(A212), or maximum heating Flowrate setpoint. The modulating hot water reheat valve will then drive open
to maintain the desired heating setpoint.
Typically, the modulating heating valve may be controlled by either
AO-14
or
DO-11
and
DO-12
in a tri-state
control mode where
DO-11
drives the hot water valve open, and DO 12 drives it closed. There are additional
options available such as having
AO-14
as first stage modulating heat and AO 15 as second stage modulating
heat.
FAN CONTROL
Parallel Single Speed Fan Option
During the occupied mode, the intermittent single speed fan will be energized in the heating mode. The fan
control matrix is as follows:
MODE
COOLING
DEADBAND
HEATING
Occupied
Off
Off
On
Unoccupied
Off
Off
On
Warm-up
Off
Off
Off
Standby
Off
Off
On
Series Single Speed Fan Option
The fan will operate continuously whenever the unit is in the occupied state, or in another state and in the
cooling or heating mode. The fan control matrix is as follows:
MODE
COOLING
DEADBAND
HEATING
Occupied
On
On
On
Unoccupied
On
Off
On
Warm-up
N/A
Off
On
Standby
On
Off
On
Summary of Contents for CBV-2U4-3T
Page 1: ... USER GUIDE MAN0139 rev 14 CBV 2U4 3T N ...
Page 75: ......