Desa BNG150T - Manual (Page 6)

6 103887
NATURAL GAS CONSTRUCTION HEATER
150,000 BTU/HR
FAN CROSS SECTION LP-PFA/P 013
Figure 6 - Fan Cross Section
Fan
Hub
Setscrew
Motor
Shaft
FAN LP-PFA/P 023 Figure 5 - Fan, Motor Shaft, and Setscrew
Location
Motor shaft
Fan
Setscrew
SPECIFICATIONS
Input Rating (Btu/Hr) 150,000
Fuel Natural Gas Only For All Models
Fuel Consumption 146 Cubic Feet/Hour
Supply Pressure To Heater Min: 5"WC Max: 1/2 psi
Internal Regulator Outlet Pressure 4" WC (Factory Preset)
Manifold Pressure
5" WC
Hot Air Output (CFM Approx) 550
Motor 3,430 RPM, 1/8 HP
Electric Input 120 V/60 Hz
Amperage 2.2
Ignition Direct Spark, Interrupted Type
Ignitor Gap (Inches) .13/.15
Weight (Pounds) Heater: 24 Shipping: 35
Size - L x W x H (Inches) 36 1 /
4
x 14 1 /
2
x 20
FAN
IMPORTANT: Remove fan from motor
shaft before removing motor from heater.
The weight of the motor resting on the fan
could damage the fan pitch.
1. Remove upper shell (column 1).
2. Use 1/8" hex wrench to loosen setscrew
which holds fan to motor shaft.
3. Slip fan off motor shaft.
4. Clean fan using soft cloth moistened
with kerosene or solvent.
5. Dry fan thoroughly.
6. Replace fan on motor shaft. Make sure
setscrew is touching back of flat sur-
face on motor shaft (see Figure 6).
7. Place setscrew on flat of shaft. Tighten
setscrew firmly (40-50 inch-pounds).
8. Replace fan guard and upper shell.
IGNITOR
1. Make sure gap between ignitor elec-
trode and burner nozzle is .13⁄.15".
Access ignitor electrode from inside
combustion chamber. No other main-
tenance is needed for ignitor.
SERVICE
PROCEDURES
UPPER SHELL REMOVAL
1. Remove screws along each side of
heater using 5/16" nut-driver. These
screws attach upper and lower shells
together.
2. Lift or slide upper shell off.
3. Remove fan guard.
Figure 4 - Upper Shell Removal
WARNING: Never service
heater while it is plugged in, con-
nected to gas supply, operating,
or hot. Severe burns and electri-
cal shock can occur.