Berner International B-22 Manual De Usuario

(F) Fan Starter: Although not normally considered a

safety device, the fan starter is wired so that its 13-14

interlock powers the control system. Thus the main fan

must be energized before the gas system can be pow-

ered. This provides one more assurance, in addition to

the Airflow Switch, that the fan is operating before heat

comes on.

(G) Secondary Safety** and Bleed Valves (or “Block &

Vent Valves): A second main line gas valve is installed

downstream of the primary safety valve. A vent line with

an electrically operated normally-open valve takes off lat-

erally between the two main line valves. This vent line

must be piped to atmosphere outside the building, by the

customer on installation (See Suggestions for Regulator.

)

IX.

O P E R ATION

M A I N T E N A N C E

(Note:

See wiring diagram for part number and manufacturer

of any control component. See manufacturer’s instruction

sheets for more information.)

(A) Fan Motor Bearings: Refer to green sheet on mainte-

nance of direct-connected fans. Most fan motors have a

1/8" NPT pipe at each bearing, which may be removed

for lubrication, in the event lube tubes were not factory-

installed.

(B) Burner: Side plates and their air holes should be

checked periodically, to be sure these parts are not fouled

or plugged.

(D) Fireye: The UVM-IF utilizes solid state components.

The only required maintenance is on its external compo-

nents; i.e., the Flame Rod and the Ultra -Violet Scanner.

See “Maintenance” in manufacturer’s bulletin C-400.

(E) Scanner: Remove scanner occasionally, clean lens,

and be sure that mounting pipe nipple is clear of insects

and dirt.

(F) Spark Ignitor: Ignition takes place by means of a spark

jumping from the ignitor to the side plate of the burner.

The spark gap should be 1/8" to 3/16" (. 12" -. 19"), and

located downstream of an air mixing hole, so that there is

a gas-air mixture to be ignited. Check for carbon “bridge”

between electrode and burner which may short out spark

and prevent ignition.

XI.

T R O U B L E S H O O T I N G

First check for loose wiring connections.

Then check the following for specific symptom:

(A) Fan Won’t Start -

(1) Selector in “OFF” position.

(2) Check 3-phase line leads for power across all 3

phases, if one line is dead, check fuses or breaker in

main disconnect.

(3) Check fuse on control circuit transformer.

(4) Try “SUM” setting. If fan runs, but won’t run on “@”,

check 1T’HS outdoor thermostat (if used) for open R-B

contact; check limit switch on door for open-contact.

(A) Gas Adjustment: Heat output is adjusted by varying

the outlet pressure of the regulator (see Gas Pressure

Regulator). A pressure gage may be attached to the pip-

ing at a leak-test connection. Table 1 shows performance

at various inlet pressures.

(B) Pilot Adjustment: This heater is equipped with inter-

rupted pilot; i.e., after main burner ignites, pilot is cut off.

Scanner then senses main flame only. Pilot flame was

properly adjusted at the factory. Field adjustment is pos-

sible by removing the protective cap and using a screw-

driver with a small bit.

G A S

SUPPLY

P R E S S U R E

(in. w.g.)

MODEL B-22, 6500 CFM

5”

700

169

6”

765

109

179

7”

820

117

187

8”

7” MAX. RECOMMENDED

1000’S

BTU/HR

RISE

(º F)

FINAL T E M P.

(º F)*