What is a Johnson Air Rotation® System?



Heating



Specifications for Heating

Heating Unit Features

Heating Efficiency Comparison



Cooling



Specifications for Cooling

Cooling Unit Features

Cooling Efficiency Comparison



Heating & Cooling

Specifications

Unit Features

Efficiency Comparison



Johnson Air Rotation® 
Optional Features



Industry-Specific Applications

 System Specifications for Heating and Cooling

The Johnson Air Rotation® System Heating and Cooling Guide Specification provides all of the information you need for brand new installations as well as retrofit projects for warehouses, distribution centers, manufacturing facilities, and other large, open buildings.

Fact Sheet
Johnson Air Rotation® System Heating and Cooling Guide Specifications
The heating and cooling system shall consist of a Johnson Air Rotation® system custom designed and manufactured by the Johnson MarCraft of St. Louis, Missouri. The equipment shall be located per agreement between Johnson MarCraft and the owner.

General Inforamation
The Air Rotation® units shall be tested by the manufacturer, incorporating the following:

The unit shall be manufactured to the standards of and approved by FM (IRI or UL®) as designated by the owner or his agent. The entire unit assembly and flue shall be listed, approved and labeled by Underwriters Laboratories (UL®), and shall be manufactured and tested in a UL®-approved and certified Test Data Program.

Air Mover and Inlet Module
The Air Base expanded metal grill shall be custom designed by Johnson MarCraft to suit the individual unit location. The expanded metal grill shall be fabricated from 9 gauge steel.

The unit shall have a 25" x 39" lockable access door. A "Warning Placard" shall be
affixed at the access door indicating that the unit is to be shut off before opening the door and entering the fan compartment.

The air fans shall be equipped with dual belt drives with the drives selected for not less than 400% of the horsepower rating. All belts on the unit shall be of the industrial grip notch type selected for extended service life.

The unit manufacturer shall conduct sound testing in its manufacturing facility and certify said testing is at 78 decibels or less.

Cooling coils and drain pans shall be mounted at floor level for ease of maintenance and inspection. Cooling coils shall use 0.020” copper tubes and 0.0075” aluminum fins. Standard: ARI 410 rated DX Type or Chilled Water Type Cooling Coils. Coil casings shall be 16-gauge galvanized steel. The drain pans shall be triple pitched for complete drainage and be constructed of welded 304 stainless steel. Intermediate drain pans shall have a copper downspout to the lower drain pan. The drain pan connection shall be a minimum of 6" (152 mm) above the unit base for trapping. Face velocity of cooling coils shall not exceed 500 fpm.

Filters: (Type 1): Pleated type, average efficiency of 25% - 30%, with average arrestance of 90% - 92% in accordance with ASHRAE 52 Test Standard. Maximum Face Velocity: 500 fpm (2.54 m/s). Depth: 2" (51 mm) deep. UL Classification: Class 2. Filters: Nonwoven cotton and synthetic fabric type manufactured by Farr, American Continental Filters. Filters shall be mounted in slide tracks at ground or floor level for ease of inspection and changing without access doors or other restrictions.

Filters: (Type 2): Washable aluminum mesh. Maximum Face Velocity: 600 fpm (3.05 m/s). Depth: 2" (51 mm) deep. Filters shall be mounted in slide tracks at floor or ground level for ease of inspection and changing without access doors or other restrictions. Draw-through cooling coils and stainless steel drain pans shall be mounted at floor level with the coils in a vertical position for ease of inspection, maintenance and replacement.

Power and Control Panels
There shall be separate power and control panels. Both panels are equipped with locks and are keyed alike. Three keys will be supplied. The power panel will contain all threephase wiring. The control panel will be single-phase only, factory wired to the power panel providing a single point power installation.

There shall be a locking control cabinet with flame failure alarm horn, modulating temperature controls, and displaying pilot lights to indicate "power on", "call for heat", and "rear fan failure" light indicator.

The power panel shall have a locking dead front main power cabinet with disconnect and containing necessary fuses, sub-circuits, magnetic starters with 3-leg protection, relays, and control transformers.

The unit shall have a 24-hour 7-day clock and two thermostats per unit, day stat and night stat, mounted inside the control panel to allow for temperature setback during unoccupied periods. The sensors shall be mounted at the unit inlet to provide accurate readings.

The control panel shall contain an emergency shutdown circuit, which may be supervised by the fire protection system in the facility. At owner's option this can be accomplished with an external power source of either 120 volts or 24 volts.

The control panel shall contain a fan control switch allowing selection of continuous multiple fan operation, or an energy conservation-operating mode wherein one fan operates continuously and the other operates as required to be controlled by the temperature rise of the air being moved by the unit.

Heater Module Gas
The primary furnace, rear header, tube sheets, and front collector box shall be manufactured of high temperature quality stainless steel.

The factory-mounted gas train shall contain dual motorized automatic gas valves.

The burner and heat exchanger shall be designed to allow for a flue the equivalent length of two 45-degree elbows and 30 feet of horizontal pipe run. If the flue design results in greater resistance, consult with Johnson MarCraft to determine what changes may be required.

The flue shall be supported independent from the unit flue gas outlet collar, and shall be UL® listed.

The flue shall be designed and furnished by the Air Rotation® System manufacturer and shall be gas tight, meet all applicable local codes, and shall be double-wall stainless steel. The flue shall have an appropriate rain cap. See Johnson MarCraft drawing EDF-163-R2 for dimensional criteria.

The unit shall have a permanently mounted 3" dial gauge thermometer mounted in the front flue box assembly for monitoring flue gas temperature, and a port for a gas analyzer sensor.

The heater module shall have thermal insulation installed throughout.

Heater Module Oil
The primary furnace, rear header, tube sheets, and front collector box shall be manufactured of high temperature quality stainless steel.

Fuel fired units are capable of using natural gas, propane, and #2 fuel oil. Units can be supplied for any individual fuel or any combination.

Each unit shall be equipped with a separate oil atomizing pump motor and oil recirculation loop to ensure an air free oil supply.

Multiple unit oil systems shall be designed to be supplied with oil by a one-pipe oil distribution system. Johnson MarCraft will supply specific recommendations for oil tank piping, oil distribution system piping, and unit supply piping.

The burner and heat exchanger shall be designed to allow for a flue the equivalent length of two 45-degree elbows and 30 feet of horizontal pipe run. If the flue design results in greater resistance, consult with Johnson MarCraft to determine what changes may be required.

The flue shall be supported independent from the unit flue gas outlet collar, and shall be UL® listed.

The flue shall be designed and furnished by the Air Rotation® System manufacturer and shall be gas tight, meet all applicable local codes, and shall be double-wall stainless steel. The flue shall have an appropriate rain cap. See Johnson MarCraft drawing EDF-163-R2 for dimensional criteria.

The unit shall have a permanently mounted 3" dial gauge thermometer mounted in the front flue box assembly for monitoring flue gas temperature, and a port for a gas analyzer sensor.

The heater module shall have thermal insulation installed throughout.

Air Outlet Module
The Air Outlet Module shall be custom designed by Johnson MarCraft to ensure appropriate air discharge at the designated location using both horizontal and vertical, adjustable louvers, to direct discharge.

The discharge shall include turning vanes to minimize static loss within the unit and to assist in the directional discharge. Turning vanes shall be designed to direct air toward each side of the unit discharge.

The unit shall be supplied with heat outlet extensions, which will be shipped to the jobsite as four flat panels to be bolted together at the jobsite. The outlet extensions will be designed to elevate the unit outlet as shown on the drawings, or above any obstructions in the space.

General Comments
All flat panels used in unit manufacture shall be 18-gauge steel.

All solid panel portions of the air mover and inlet module shall have sound insulation installed.

All unit modules shall be assembled with flat bar screwed in place and either grill or solid panel. The grill and solid panel sections are easily removed to allow access to the interior of the unit. Combustible materials may be placed or stored as close as 48 inches from the front side (burner side) and 18 inches from all other sides, including the top side, of the entire unit assembly.

Technical Field Service
Incidental to the sale of this equipment, the services of a factory trained Field Engineer will be provided at no added cost to supervise placing the System in operation and good adjustment. The Field Engineer will instruct the owner's personnel in equipment operation, and review maintenance procedures with the owner's qualified personnel or qualified representatives.

To receive a complete Johnson Air Rotation® System Heating and Cooling Specification by mail, contact CustomerService@Johnson-Marcraft.com.