Conventional Thermostat Sequence Of Operation - Trane Symbio 700 Controller Application Manual

Conventional Thermostat Sequence of Operation

When the Precedent system is configured to operate with a conventional thermostat, the controller
provides protection for the system (see General Support Sequence section) and continues to provide
insight to operating conditions. A conventional thermostat can be applied with CVZT and single zone
VAV configured systems. While not recommended, a conventional thermostat can be applied to single
zone variable volume configured systems, but the system is limited to staged fan control instead of a
fully variable sequence.
When under conventional thermostat control, the equipment responds directly to operating requests
from the thermostat device. Each thermostat input corresponds to a specific unit function, as described
in the following tables. Equipment protection functions and compressor minimum on/off timers remain
in-control, even when under conventional thermostat control.
Table 2. Cooling only, without outside air
X Y1
NA OPEN
NA OPEN
NA OPEN
NA CLOSED
NA OPEN
NA CLOSED
NA X
14
Inputs
Y2 W1/O
OPEN OPEN OPEN
OPEN CLOSED OPEN
OPEN X CLOSED
OPEN OPEN OPEN
CLOSED OPEN OPEN
CLOSED OPEN OPEN
X X
Supply Fan
On/Off
W2 G
Request
CLOSED ON
X ON
X ON
X ON
X ON
X ON
X X OFF
Outputs
Supply Fan Compressor Auxiliary
Speed Cool Stage Heat Stage
Request Request Request
Min None
Stage 1
Min None
Full Stage
Min None
Stage 2
Min
Stage 2
Min
Full Stage
Max
0 None
Heat Cool
Mode Status
Fan Only
None
Heat
Heat
None Cool
None Cool
None Cool
None OFF
ACC-APG002A-EN