ENVIRO-TEC
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S1 – Common side of transformer. Jumped to “C” (com-
mon) through JP2. If application calls for oat switch JP2 is
removed and oat switch is connected between S1 and C.
S2 – Convenience terminal. Not connected to other com-
ponents on the board. Used for different functions based on
application, such as 2nd stage heat control tie point for two
stage EH applications, or changeover water valve/aquastat
tie point for two pipe changeover applications. May also be
used as tie point for “Close” input of modulating hot water
valve actuator and “Close” output of thermostat in oating
[tristate] water valve applications.
R – Transformer “hot” connection (side of transformer that’s
not the one used for valve actuator, EH, etc. commons). Con-
trol outputs to board should close to “R” to energize (Refer to
thermostat literature. At least one thermostat, the T600/TEC
model line is known to use the “R” for valve common but
the “C” for fan speed common. This is the only known (by
JCI Largo Engineering) case in which this occurs. All other
thermostats dealt with use the “C” for all device commons).
C – Device common, including onboard speed relays (all
terminals “C” and “COM” on board are tied together).
C – Device common
Y1 – Tie point for chilled water valve actuator control input,
and thermostat cooling output. Convenience terminal, not
connected to anything else on board.
W1 – Tie point for hot water valve actuator or 1st stage EH
control input, and thermostat heating output. Convenience
terminal, tied to P22 “Heat” quick connect for factory ter-
mination to EH relay if applicable.
Y2 – tie point for “Close” input of modulating chilled wa-
ter valve actuator or 2nd stage chilled water valve actuator
control input, and thermostat cooling output. Convenience
terminal, not connected to anything else on board. Y1 is
“Open” output if oating {tristate} chilled water valve actua-
tor is supplied (or used).
G – Connected to “R” thru JP3. Used (with JP3 removed) for
input from single speed (residential style) thermostats that do
not supply three speed fan switching. In these applications, a
separate three speed switch may be used with the “H”, “M” or
“L” inputs, of the provided jumper to set a xed fan speed. If
thermostat supports three speed switching, “H”, “M” and “L”
inputs should be used, and JP3 should remain in place.
H – High speed control input for onboard relay. Parallels the
P17 “HIGH” quick connect input. If thermostat or indepen-
dent three speed switch is used, remove jumper JP1 (female
to female quick jumper wire).
M – Medium speed control for onboard relay. Parallels the
P16 “MED” quick connect input.
L – Low speed control input for onboard relay. Parallels the
P15 “LOW” quick connect input.
HEAT (P22) – Same functionality as W1 when operating
EH.
TROUBLE SHOOTING GUIDE FOR FAN COIL RELAY BOARD
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