Sequence Of Operation; Terminal Descriptions - ECR Argo ARH-1 Installation Manual And Operating Instructions

When the thermostat calls for heat, the boiler end switch closes,
starting the burner and energizing the heating circulator. The fan
will operate at low speed (G1) when the water temperature is above
the aquastat setting at the Hydro-Coil.
When priority zone is actuated, the priority circulator and boiler end
switch is energized. The heating circulator is shut off and the fan will
operate at low speed (G1) until the water temperature drops below
the aquastat setting.
When the thermostat calls for cooling, the Argo Control energizes
the outdoor condenser and starts the fan on high speed (G2).
Optional Freeze Protection for Hydro-Coil: When the Freeze Ter-
minals (TT) are shorted together as with SPST actuator, the heating
zone circulator will operate to circulate water through the Hydro-
Coil.
Tor additional zones, use telephone connector to ARH-1 module.
Up to 20 Air Handler Zones can be "Daisy Chained" together.
W - Heat Switched Leg
G - Fan Switching Leg
Y - Cool Switching Leg
R - 24VAC Hot
C - 24VAC Common (Optional for use on thermostats
requiring common leg)

SEQUENCE OF OPERATION

TERMINAL DESCRIPTIONS

Thermostat
9