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VAV-PRC011M-EN 61

Single-Duct VAV Terminal Units

Outlet Conection

Slip & Drive Connection—Terminal units come standard with slip & drive connection.

Outlet Plenum—A sheet metal, insulated box with circular opening(s) is attached to main unit

discharge at the factory. Circular opening(s) are centered on unit plenum to accept round ductwork

connections.

Outlet Plenum with Balancing Dampers—A sheet metal, insulated box with circular opening(s) is

factory- connected to the main unit. The circular opening(s) with balancing damper(s) are centered

on the unit plenum to accept round ductwork connections.

Hot Water Coils

All hot water coils are factory-installed on the discharge outlet. Full fin collars provided for accurate

fin spacing and maximum fin-tube contact. The 3/8" (9.5 mm) OD seamless copper tubes are

mechanically expanded into the fin collars. Coils shall be subjected to a pressure decay test at 450

psig for a minimum of 45 seconds. Coils shall then be evacuated and charged with a helium gas

mixture and pressurized to 150 psig. While pressurized with the helium gas mixture, the coil shall

be checked with a gas analyzer to detect helium leaks. Alternatively, the coil shall be subjected to

a final air-under-water leak test at 300 psig.

1-Row Hot Water Coils— The 1-row coil has 144 aluminum fins per foot. Full fin collars provided

for accurate fin spacing and maximum fin-tube contact. Coil connections are left-hand. Right-hand

connections are optional. Coils are assembled with either 3/8" or 7/8" (22.2 mm) OD braze

connections.

2-Row Hot Water Coils— The 2-row coil has 144 aluminum per foot. Coils are assembled with

headers that provide 7/8" (22.2 mm) OD braze connections. Right-hand connections are optional.

3-Row Hot Water Coils—The 3-row coil has 120 aluminum fins per foot. Coils are assembled with

headers that provide 7/8" (22.2 mm) OD braze connections. Right-hand connections are optional.

4-Row Hot Water Coils—The 4-row coil has 120 aluminum fins per foot. Coils are assembled with

headers that provide 7/8" (22.2 mm) OD braze connections. Right-hand connections are optional.

Electric Heat Coils

The electric heater is a factory-provided and -installed, UL recognized resistance open-type heater

with airflow switch. It also contains a disc-type automatic pilot duty thermal primary cutout, and

manual reset load carrying thermal secondary device. Heater element material is nickel-chromium.

The heater terminal box is provided with 7/8" (22 mm) knockouts for customer power supply.

Terminal connections are plated steel with ceramic insulators.

Electric Heat Options

Silicon-Controlled Rectifier (SCR)—Optional electric heat control that provides modulation. Allows

use of energy efficient dual max algorithm with selection of UC210 or UC400 controls. See “Single-

Duct: SCR Modulation of Electric Heat,” p. 84 for detailed description of dual max algorithm

function.

Electric Heat Transformer—Optional transformer is an integral component of heater control panel

(dependent on unit load requirements) to provide 24 VAC for controls. There is 19 VA available for

controls.

Magnetic Contactor—Optional electric heater 24V contactor for use with direct digital controls.

Mercury Contactor—Optional electric heater 24V contactor for use with direct digital controls.

P.E. Switch with Magnetic Contactor—This optional switch and magnetic contactor is for use with

pneumatic controls.

P.E. Switch with Mercury Contactor—This optional switch and mercury contactor is for use with

pneumatic controls.

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