Manual

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Installation

1. Install the door heater in the position required. Dimensions

can vary to suit door opening. Heaters can be mounted in

horizontal, angular or vertical position. Do not mount with

the control box upside down or on the bottom. Weight of

the unit is approximately 375 lbs.

NOTE: Negative pressure in the building will have an

affect on the unit’s ability to maintain an air curtain effect.

This should be taken into account when locating the unit.

2. Connect electrical power. If the unit does not have a built-

in disconnect switch, then an external disconnect should be

provided by the installer. Be sure power supply is the

proper voltage. These units are furnished for specified volt-

age.

Gas Door Air Heater

3. Connect the gas supply line using the regulator furnished

with the unit. Consult your gas company service represen-

tative to determine the proper size for the gas line. This

varies according to the pressure and length of the run.

Required gas input can be determined by the chart, Fig. 1.

NATURAL. GAS INPUT NOMINAL GAS

MODEL NO. BTU TEMP. RISE PRESS.

24S728 325,000 73°F 1 oz.

NDH* 440,000 99°F 2 oz.

3/4 HP 580,000 131°F 3 oz.

440,000 66°F 2 oz.

580,000 85°F 3 oz.

24S728 680,000 102°F 4 oz.

NDH* 790,000 118°F 5 oz.

2 HP 870,000 130°F 6 oz.

990,000 148°F 7 oz.

*PDH = Propane units

4. Mount the operating station in a convenient location and

make connections to the terminal strip in the unit as indi-

cated in Fig. 2, or Fig. 3 for units supplied with the option-

al high-low fire feature.

Fig. 2. Operating Station

Connect H, 1, 2, and R to terminal

strip in unit control box.

Fig. 3. Operating Station with Optional Hi-Lo Fire

Connect H, 1, 2, R, 13 and 15 to

terminal strip in unit control box.

Typical Overhead Door

Angular Mounting Approx. 45°

Roll Top or Straight Lift Door

Vertical Mounting Used With Roll Top Doors

General Installation, Operation and Maintenance Instructions For Aerovent Products

IM-200

June 1997

Summary of content (4 pages)

PAGE 1
IM-200 June 1997 General Installation, Operation and Maintenance Instructions For Aerovent Products Gas Door Air Heater Installation 1. Install the door heater in the position required. Dimensions can vary to suit door opening. Heaters can be mounted in horizontal, angular or vertical position. Do not mount with the control box upside down or on the bottom. Weight of the unit is approximately 375 lbs.
PAGE 2
5. Mount the door switch so it will trip to close the circuit when the door is open. The switch may be located so the heater will come on when the door starts to open or when fully open at the discretion of the user. See typical suggested installations. “FREE” POSITION: 360° location on actuator shaft Door Switch and Suggested Installations The door switch may be installed with the switch in the “free” position when the door is either opened or closed.
PAGE 3
Standard Wiring and Piping Sequence of Operation overhead door. Normal operation is to leave the on-off switch “on” and cycle the unit with the door switch as the overhead door on the dock opens and closes. Door opening closes the switch between terminal #1 and #3; the fan starts. Interlock (E) on the fan starter (FSR) closes the circuit between terminal #6 and #7. An electrical circuit is made to terminal #7 through the high gas pressure switch (C) and airflow switch (D).
PAGE 4
High-Low Fire Option Units ordered with the high-low fire option are supplied with a 1" NPT SR600 two-stage valve mounted in the pipe train. The SR600 provides an economical means of flame staging where infinite modulation is not required. Turn-down on lowfire is from 25% to 75% of high-fire. This valve is powered by a 24 volt AC transformer. When the coil is energized, the valve is at low-fire. When the coil is de-energized, it is at high-fire. Make sure plunger is installed as above.