©Johnstone Supply eCatalog 216

COMMERCIAL CONTROLS Pneumatics

Pneumatic Controllers • Proportional, high capacity, single or dual input controller • Used with remote sensors with output of 3 to 15 PSI to provide control of temperature, humidity, pressure or dewpoint for heating • Field reversible action and adjustable compensation start point • Integral action cut off provides trouble-free automatic startup • L40-043 has remote control point adjustment

Specifications: • Maximum supply air: 30 PSI @ 0.07 SCFM air capacity • Output signal: 3 to 13 PSI • Adjustable proportional band: 2.5% to 50% of primary sensor span • Integral reset time: 0.5 to 20 minutes, adjustable • Authority for L38-527 : 5% to 300% of span • Compensation start point for L38-527 : 0 to 100% of span • Air capacity: 0.07 SCFM

A

B

Each

Fig. Order # Mfg. #

Type

Air Consumption 0.021 SCFM 0.021 SCFM 0.046 SCFM

Dimensions

L40-043 RP920A1025 Single Sensor

A A B

3-13/16" W x 5-7/8" H x 3- 1/4" D without Cover x 3- 3/8" D with Cover 3-13/16" W x 5-7/8" H x 3-1/4" D without Cover x 3-3/8" D with Cover

1545.00 1445.00 1545.00

L38-526 L38-527

RP920A1033 Single Sensor RP920B1031 Dual Sensor

3-13/16" W x 5-7/8" H x 3-1/4" D

Velocitrol ® Velocity Sensor/Controllers • Ultra-sensitive air velocity sensor and pneumatic controller control pneumatic damper actuators in HVAC systems to provide constant air velocity in the duct regardless of the static pressure • Not position sensitive • Insensitive to static pressure changes • Graduated scales for minimum and maximum velocity adjustments

Specifications: • Airflow: Usage: 0.029 SCFM

• Humidity ratings: 5 to 95% RH (operating) • Pressure ratings: 18 to 20 PSI (operating); 30 PSI (maximum) • Operating temperature range: 40°F to 130°F • Sensor sensitivity: Less than 5 ft/min. maximum (no orifice) • Dimensions: Sensor is 1-3/4" W x 3-3/16" H x 4-3/16" long with orifice, 3-3/8" long without orifice; Controller is 3-1/4" W x 1-3/4" H x 2-3/8" D • Velocity range FPM 500; reset pressure 9 to 15 PSI

• Velocity reset by thermostat demand • Adaptable to many terminal unit control strategies • Dual Duct Variable Constant Volume application

Each

Order # Mfg. #

Description

For Use With

L39-850 CP980E1060 Direct, Sequencing, Sensor C Type

Normally Open Damper and Two-Pipe Thermostat Normally Closed Damper and Two-Pipe Thermostat

1999.00 1599.00

L39-851

CP980F1068 Reverse, Sequencing, Sensor C Type

Selector Relay • Three-port relays transmit the higher of two input signals, lock out one pressure signal when a second signal is higher, or transmit the lower of two pressure signals • Molded plastic construction includes mounting clip

Specifications: • Operating range: 0 to 18 PSI • Maximum supply air: 30 PSI • Air capacity: 0.039 SCFM @ 1 PSI differential • Dimensions: 1/2" diameter x 1" L

Each

Order # Mfg. #

Description

L38-523 RP470B1001

Lockout/Lower Pressure Selecting

165.00

Snap-Acting Relay • Four-port relay converts a proportional pressure change to a positive two-position pressure change • Molded plastic construction which includes mounting clip

Specifications: • Operating range: 0 to 18 PSI

• Setpoint: 3 to 15 PSI, adjustable • Differential: 1 PSI maximum, fixed • Maximum supply air: 30 PSI • Air capacity: 0.039 SCFM @ 1 PSI differential • Dimensions: 1-1/2" D x 2 -3/4" L

Each

Order # Mfg. #

L38-522 RP471A1002

455.00

414

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