Berner B-24 Handbuch für Installation und Wartung - Seite 4

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( 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 Va l v e s ) : A second main line gas valve is insta l l e d

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. )

I X .

O P E R ATION

G A S

SUPPLY

1000'S

P R E S S U R E

BTU/HR

( i n . w. g . )

5 "

700

6 "

765

7 "

820

8 "

G A S

SUPPLY

1000'S

P R E S S U R E

BTU/HR

( i n . w. g . )

5 "

790

6 "

865

7 "

930

8 "

990

* B a s e d o n 7 0 º F . i n l e t t e m p e r a t u r e .

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

t h e outlet pressure of the regulator (see Gas Pressure

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

i n g a t a l e a k - t e s t c o n n e c t i o n . Table 1 shows performance

at various inlet pressures.

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

r u p t e d p i l o t ; i . e . , a f t e r m a i n b u r n e r i g n i t e s , p i l o t i s c u t o f f .

Scanner then senses main flame only. Pilot flame was

properly adjusted at the factory. F i e l d adjustment is pos-

sible by removing the protective cap and using a screw-

d r i v e r w i t h a s m a l l b i t .

MODEL B-22, 6500 CFM

RISE

FINAL T E M P.

( º F )

( º F ) *

109

117

7" MAX. RECOMMENDED

MODEL B-24, 7900 CFM

FINAL T E M P.

RISE

( º F ) *

( º F )

101

109

116

X .

MAINTENANCE

(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-

i n s t a l l e d .

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

checked periodically, to be sure these pa r ts are not fouled

or plugged.

( C ) Burner Adjustment: (See Operation).

( 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, c l e a n l e n s ,

and be sure that mounting pipe nipple is clear of insects

and d i r t .

169

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

179

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

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

187

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.

X I .

TROUBLESHOOTING

162

First check for loose wiring connections.

171

Then check the following for specific symptom:

179

( A ) Fan Won't Start -

186

( 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.