Greenheck Fan Ultimate Guide to IMO XXX Series Ventilation Hood Size Limitations and Specifications

Size Limitations

Damper model	Maximum Single	Maximum Overall size for
	Section size	Multi-section dampers
IMO-310	32 in. x 32 in.	64 in. x 32 in.
	(813mm x 813mm)	(1626mm x 813mm)
SSIMO-310	32 in. x 32 in.	64 in. x 32 in.
	(813mm x 813mm)	(1626mm x 813mm)
IMO-311	32 in. x 32 in.	64 in. x 32 in.
	(813mm x 813mm)	(1626mm x 813mm)
SSIMO-311	32 in. x 32 in.	64 in. x 32 in.
	(813mm x 813mm)	(1626mm x 813mm)

Manually operated dampers (IMO-310 & SSIMO-310)

Manually operated dampers utilize a spring and fusible link assembly to close the damper during elevated temperature conditions. No electrical power is required for these models.

Motor operated dampers (IMO-311 & SSIMO-311)

Motor operated dampers are supplied with an electric thermal response device which cuts power to the spring return actuator upon sensing an elevated temperatures. See below for electrical connections.

Connection and Operation of Temperature Response Devices (RRL standard, OCI option, and PRV option)

RRL - Dampers will be supplied with a thermostat-type temperature response device, as a standard. The device is a RRL (resettable link device), which only incorporates one thermostat and therefore the damper remains closed as soon as its sensor temperature is reached. The RRL does not contain blade indication switches. Refer to Figure 5 for wiring of the RRL

thermostat.

If RRL is ordered with a pneumatic actuator, an EP switch is required with an appropriate electric power circuit to allow the electric thermostat to control the pneumatic actuator.

OCI - The OCI (open or closed indicator) option contains a single pole, double throw switch used to indicate the damper blade position. The switch provides a positive open or closed signal when used in conjunction with remote indicator lights. Refer to Fig. 7 for wiring of the OCI option.

ELECTRICAL CAPACITY = 10 AMP @ 120 / 240 VAC

L1			RRL Wiring		L2
ORANGE		NC	BLACK	BLACK	M WHITE/RED
		P
		PRIMARY TEMP		ELECTRIC DAMPER
		SENSOR		ACTUATOR OR PNEUMATIC
Fig. 5				SOLENOID VALVE
NOTE: THE SWITCH WIRES WRAPPED WITH
	A BLUE MARKER INDICATE THE
	CLOSED POSITION OF THE DAMPER.
ELECTRICAL CAPACITY = 10AMP @ 120 / 240VAC
L1					L2
			OCI Wiring
					BY OTHERS
YELLOW S1			YELLOW
		NO			DAMPER
					INDICATOR
YELLOW		S2	YELLOW
					LIGHTS

NO

PRV - The PRV (pneumatic relief valve) option is heat responsive			Fig. 6
device used with pneumatic actuators. This can be used in place
of EP switch where a RRL is used. The PRV activates when	RATINGS
temperature in excess of the temperature of the fusible link are
detected. When the fusible link melts, air from the actuator is	Integral Switch Type: Single Pole, double throw
exhausted to close the dampers. Pneumatic actuators are to be
piped per local code.		Electrical Capacity: 10 Amps, 1/3 hp, 120 or 240 Vac

1/2 Amp, 125 Vdc; 1/4 Amp 250 Vdc 5 Amps, 120 Vac “L” (lamp load) 1.0 Amps, 24 Vac

1.5 Amps, 24 Vdc

Temperature Limit: 165° F (standard primary sensor) 212° F (optional primary sensor)