©Johnstone Supply eCatalog 216

HVAC CONTROLS Zone Control Systems

Automatic Round Dampers • Features galvanized steel with single-blade damper, which closes off tightly against gasket for minimal leakage • Designated as power closed/spring return open damper for use with Honeywell Zoning Systems

• Can be field-converted when used as an independent zone or for fresh air intake • Rated to operate up to 1 in.W.C. • L81-631 and L81-632 are used for fresh air intake for ventilation or for combustion makeup air

Order # Mfg. # Description L81-620 ARD5TZ 5 in. Round Automatic Damper L81-621 ARD6TZ 6 in. Round Automatic Damper L81-631 L81-622 ARD7TZ 7 in. Round Automatic Damper L81-623 ARD8TZ 8 in. Round Automatic Damper L81-632 L81-624 ARD9TZ 9 in. Round Automatic Damper

Order # Mfg. #

Description

L81-625 L81-626 L81-627

ARD10TZ 10 in. Round Automatic Damper ARD12TZ 12 in. Round Automatic Damper

EARD6TZ 6 in. Economizer Automatic Round Damper

ARD14TZ 14 in. Round Automatic Damper L81-628 ARD16TZ 16 in. Round Automatic Damper L81-629 ARD18TZ 18 in. Round Automatic Damper L81-630 ARD20TZ 20 in. Round Automatic Damper

EARD8TZ 8 in. Economizer Automatic Round Damper

Modulating Automatic Round Dampers • 24V, power close/power close modulating damper used to control circulating air in HVAC systems

• 90-second open to close motor • Use as a bypass damper with L39-896 static pressure control

Order # Mfg. #

Description

Order # Mfg. #

Description

L86-629 MARD6 6" Modulating Automatic Round Damper L86-630 MARD8 8" Modulating Automatic Round Damper L86-625 MARD10 10" Modulating Automatic Round Damper L86-626 MARD12 12" Modulating Automatic Round Damper

L86-627 L86-628 L97-700

MARD14 14" Modulating Automatic Round Damper MARD16 16" Modulating Automatic Round Damper MARD18 18" Modulating Automatic Round Damper

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