ENVIRO-TEC
34
FORM ET115.24-NOM11 (118)
Screw Terminal Signals:
TABLE F.9 – SCREW TERMINAL SIGNAL IDENTIFICATION
Pin Signal Signal Name
Description
1
Y1
Cool 1
Chilled water valve actuator control input, and thermostat cooling
output.
2
Y2
Cool 2
“Close” input of modulating chilled water valve actuator or 2nd stage
chilled water valve actuator control input, and thermostat cooling
output. Y1 is “Open” output if floating {tristate} chilled water valve
actuator is installed.
3
W1
Heat 1
Wire connection point for hot water valve actuator or 1st stage EH
control input, and thermostat heating output.
4
L
Low
Low speed control input for onboard relay.
5
M
Medium
Medium speed control for onboard relay.
6
H
High
High speed control input for onboard relay.
7
G
Fan Enable
Used to allow external start-stop control from an external source.
8
C
Common (through JP2)
Device common, including onboard speed relays (all terminals C and
“COM” on board are internally connected).
9
C
10
R
24VAC
Transformer “hot” connection (24VAC).
11
S2
Auxiliary Input (Heat 2)
Used for different functions based on application, such as:
• 2nd stage heat control for two stage EH applications
•
Changeover water valve/aquastat for two pipe changeover
applications.
•
“Close” input of modulating hot water valve actuator and “Close”
output of thermostat in floating [tristate] water valve applications.
12
S1
Common
Common side of transformer. Jumped to C (common) through JP2.
If application calls for float switch JP2 is removed and float switch is
connected between S1 and C.
