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 oating {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 dierent 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 oating [tristate] water valve applications.
12
S1 Common Common side of transformer. Jumped to C (common) through JP2.
If application calls for oat switch JP2 is removed and oat switch is
connected between S1 and C.
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