| AFX SERIES HEATING
SYSTEMS - SUSPENDED MODELS Standard Equipment
Cabinet : 20
gauge cold rolled steel panels, 20 gauge aluminized steel drain pans (18 gauge on AFX-224)
finished with baked enamel.
Draft Hood:
22 gauge aluminized steel.
Heating Section:
Aluminized steel heat exchanger, 18 gauge tubes and 16 gauge header plates, and 18 gauge
aluminized steel burners with stainless steel ribbon inserts.
Gas and Electrical
Components: 24 volt combination gas valve, electric ignition with
intermittent pilot and non-100% shut-off, high limit control and 115/24 volt control
transformer.
Fan(s):
Propeller type mounted for direct-drive on the shaft of fan motor.
Motor(s): 115
volt totally enclosed type, permanently lubricated with internal overload protection.
Air Discharge Vanes:
Horizontal and vertical.
Options and Accessories
Stainless Steel Heat
Exchangers: Type 409 or 321.
Electronic ignition
(Intermittent Pilot for 24v Control): For LP Gas, 100% shut-off.
For Natural Gas, 100% shut-off.
Space Thermostat:Single stage, "On-off."
Space Thermostat:Two stage.
Two-stage Gas Valve and
Thermostat: 100% or 50% gas input.
"On-Off-Auto" Fan
Switch: For mounting in wall box or with thermostat subbase.
High Gas Pressure Regulators:
To 40# gas pressure.
Power Venters:
For field installation.
Turndown Nozzles: Either 30 or 45 degrees.
NOTE: Air discharge louvers not available.
Specifications
| Model
No. |
Rating-Btuh |
Motors |
Fan |
| |
Input |
Output |
No. |
HP |
Volts |
Phase |
Amps |
Diam. |
| AFX-120 |
215,000 |
167,700 |
1 |
1/3 |
115 |
1 |
5.8 |
1 @ 20" |
| AFX-220 |
300,000 |
234,000 |
2 |
1/3 |
115 |
1 |
5.8 ea. |
2 @ 20" |
| AFX-224 |
400,000 |
304,000 |
2 |
1/2 |
115 |
1 |
7.4 ea. |
2 @ 24" |
Performance Date
| Model
No. |
Btuh
Output |
Air
Delivery SCFM |
Temp.
Rise, F |
Throw*
Feet |
SCFM
w/Floor Duct |
| AFX-120 |
167,700 |
3,850 |
40 |
120 |
3,580 |
| AFX-220 |
234,000 |
7,400 |
29 |
195 |
6,272 |
| AFX-224 |
304,000 |
10,800 |
26 |
242 |
8,500 |
*Based on ASHRAE formula in Fundamental
Handbook from tested discharge velocity using 100 FPM terminal velocity.
Operational Flexibility
There are several control options available with the new
line of AFX series heaters, each offering an operational sequence adaptable to specific
applications.
A. "On-Off" space thermostat
only which allows fan and burner operation whenever the thermostat calls for heat. While
operating costs are held to a minimum with this control system, the temperature throughout
the space will not be as even as with continuous fan operation.
B. A step up from Control Option A is the use of a two-stage
thermostat in the space. The first stage energizes the fan while the second stage
brings on the gas burner. The air circulation of the first stage fan operation recovers
the stratified heat by moving it from the upper reaches of the building down to the lower
comfort zone.
C. This control option employs the "On-Off-Auto"
fan switch is addition to an "On-Off"
space thermostat. The "On" position of the switch provides
continuous fan operation. The "Auto" position allows fan operation whenever the
"On-Off" thermostat calls for heat. Often the continuous fan position is applied
during occupied periods and the "Auto" position used for night setback. Constant
fan gives the most even space temperature.
D. A refinement of Control Option C retains the "On-Off-Auto"
fan switch feature but replaces the single stage space thermostat and gas
valve with a two-stage gas valve and thermostat. The two-stage space
thermostat modulates the gas input to the burner reducing the discharge air temperature
swings. Continuous, high volume air circulation, in conjunction with comparatively uniform
discharge air temperature, offers an excellent heating system for open air buildings. |
