Vector TCI-W Manual page 17

Heating/cooling mode changeover
Parameter Description
Fu 20 Select heat/cool changeover input (0=function disabled):
1= 1T, 2= 1H, 3= 1U, 4= 2U, 5= h/c status loop 1,
6= h/c status loop 2
Fu 21 Cooling activation delay (seconds)
Fu 22 Input limit 1
Fu 23 Input limit 2
Switch heating/cooling state based on a universal input value. The input may be from a supply media (air or water)

or outdoor air temperature sensor. For supply media temperature we recommend switching to cooling at 16°C/61°F
and to heating at 28°C/83°F. For outdoor temperature we recommend switching to cooling at 28°C/83°F and to
heating at 16°C/61°F outdoor temperature. These recommendations are given as suggestions. The ideal settings may
be different on the actual project depending on climatic and system conditions.
The change between heating and cooling is delayed to avoid unnecessary switching (FU21). Heat/cool status of one

control loop may also be determined by the heat/cool state of the other loop (FU20= 5 or 6). The control loop used to
determine the heat /cool state must be set to demand-based heating and cooling with (L23). Set limit 1 and limit 2 to
switch between heating and cooling with options below. Example: When Limit 2 is greater than Limit 1, switch heat to
cool at Limit 1, cool to heat at Limit 2. For binary open/close contact, open is a high value (100%), closed is a low
value (0%).
Mode
Doc: 70-00-0158, V1.1, Date: 20160621
Subject to alteration
Limit 2 > Limit 1
Heat
Cool
Limit Limit
Input
1 2
A
UX
Limit 1 > Limit 2
Heat
Mode
Cool
© Vector Controls GmbH, Switzerland
TCI-W Universal Controller
F C
UNCTIONS ONFIGURATION
Range
0–6
0–1275s
per input
per input
Limit Limit
Input
2 1
Default
0
300
20
40
Page 17