Configuration
Configuring The Controller
Relay Output #4
In this example Relay Output #4 is configured for the “Tower Fan” (TW
Fan). In
Figure 28
Item #1 it indicates it has a Main Control Method
of “On Above/Off Below”. This means it will use a setpoint that will
activate the relay output at a Hi Limit Setpoint and deactivate it at a Lo
Limit Setpoint.
Item #2 indicates the Control Source for this relay will be the Tower
Return Water Temperature (“TW Return Water”) on AIN2. Item #3
indicates that the Hi Limit Setpoint will be 80.0° F and the Lo Limit
Setpoint will be 78.0° F.
Item #4 Shows the Enabling Relay to be the “System Active Relay”
output configured on (Relay #8). This means that in addition to the Tower
Return Water Temperature being above setpoint the “System Active”
relay must be activated for the “Tower Fan” to run.
It also has a Logical And Control Method of “Follow Active Binary
Input” as shown in Item #5. The “Binary input To Follow” is configured
as the “Request To Run” binary input (BIN1) and is shown as Item #6.
With this configuration sequence the “TW Fan” (Relay #4) will activate
turning on the “TW Fan” when the “Tower Return Water Temperature”
(AIN2) is above 80.0° F, the “System Active” (Relay #8) relay output is
active and the “Request To Run” (BIN1) binary input is active.
If the “Tower Return Water Temperature” (AIN2) falls below 78.0° F,
the “System Active” relay output (Relay #8) is inactive or the “Request
To Run” (BIN1) binary input is inactive, the “TW Fan” (Relay #4) will
deactivate.
Relay Output #5
In this example Relay Output #5 is configured for the “Cool Bypass
Valve” output. In
Figure 29
Item #1 it indicates it has a Main Control
Method of “On Above/Off Below”. This means it will use a setpoint
that will activate the Relay Output at a Hi Limit Setpoint and deactivate
it at a Lo Limit Setpoint.
Item #2 indicates the Control Source for this relay will be the Tower
Return Water Temperature (“TW Return Water”) on AIN2. Item #3
indicates that the Hi Limit Setpoint will be 82.0° F and the Lo Limit
Setpoint will be 80.0° F.
Item #4 Shows the Enabling Relay to be the “System Active Relay”
output configured on (Relay #8). This means that in addition to the Tower
Return Water Temperature being above setpoint the “System Active”
relay must be activated for the “Bypass Valve” to activate.
It also has a Logical And Control Method of “Follow Active Binary
Input” as shown in Item #5. The “Binary input To Follow” is configured
as the “Request To Run” binary input (BIN1) and is shown as Item #6.
With this configuration sequence the “Cool Bypass Valve” (Relay #5)
will activate turning on the “Cool Bypass Valve” when the “Tower
Return Water Temperature” (AIN2) is above 82.0° F, the “System Ac
-
tive” (Relay #8) relay output is active and the “Request To Run” (BIN1)
binary input is active.
If the “Tower Return Water Temperature” (AIN2) falls below 80.0° F, the
“System Active” relay output (Relay #8) is inactive or the “Request To
Run” (BIN1) binary input is inactive, the “Cool Bypass Valve” (Relay
#5) will deactivate.
29
WSHP Loop Controller
GPC-XP Guide
