Berner International Electric Heater B 24 User Manual

Gas Fired Door Heater  
Model B-22 and B-24  
Installation & Maintenance Instructions  
BERNER INTERNATIONAL CORPORATION  
New Castle, Pennsylvania  
l
l
l
724-658-3551  
1-800-245-4455  
www.berner.com  
airdoors@berner.com  
© Copyright 2001 Berner International Corporation  
1
 
cross-sectional area should be at least equal to the sum of A manual cock (not furnished) should be piped in ahead of the  
theindividualventareas.  
regulator. (See schematic piping on wiring diagram.)  
Theoutsideendoftheventlineshouldeitherhaveaweather-  
proof vent cap or should be directed downward for weather  
protection. Itshouldalsobescreenedtopreventforeignma-  
terial or insects from entering the line. Naturally, the end of  
the line should be located in an area where it is safe to re-  
lease gas.  
VIII. SAFETY DEVICES  
(A) Gas Pressure Switches*: Two U.L. listed gas pres-  
suresupervisingswitchesareused, toshutoffgasifpres-  
surefallsbeloworrisesabovetheproper operatingrange.  
(Seewiringdiagramforpropersetting.) Switchesarepre-  
set at the factory during checkout.  
A high percentage of regulator problems is due to improper  
venting. Remember the space over the diaphragm must be  
abletobreatheforproperregulation. Ifthereisanyregulation  
problem, disconnect the vent line at the regulator to see if  
properventingisthesolution. Thenlookforundersizedlines,  
crimped tubing, clogged lines, back pressure caused by draft  
effectatendofventorpressureeffectfromotherregulatorsin  
a grouped system.  
Both switches have a vent connection for venting gas in case  
of a ruptured diaphragm. Connect vent to atmosphere per  
(Suggestions for Regulator Venting)above. The switches lock  
out if tripped, and must be manually reset. Thus, whenever  
gas is turned off manually, 1PS must be reset.  
(B) Safety Shut-OffValve: This heater is equipped with  
a motor operated gas valve having closing spring that ex-  
erts a force in excess of 5 lbs. It is a fast-open, instant  
close valve meeting the requirements of FM, UL, AGA  
and CSA.  
VI. INSTALLATION (ELECTRICAL)  
Allinternalelectricwiringisfactoryinstalled. Itisonlyneces-  
sary to connect main power leads to terminals LI - L2 - L3 of  
the tenminal strip inside the cabinet, and to wire between re-  
mote station, doorswitch, and heater.  
(C) Hi-TemperatureLimit: The “Thermodisc” limit switch  
is located near the discharge end of the heater, mounted  
on the top outside of the duct. This is a U.L. approved  
manual-reset device.  
Theremotestationmaybeinstalledatanylocationforconve-  
nience in switching the heater to “OFF” or “SUM” for warm  
weather.  
(D) Airflow Switch: A UL-FM approved differential pres-  
sure switch in the control cabinet senses velocity plus  
staticpressureoftheairflowfromthepropeller.  
This air pressure closes the switch contact to power the  
gas system, thus assuring that the fan is on before the  
gas can ignite.  
The door limit switch must be installed on the door frame in  
such a way that it is tripped by the opening of the door. A  
switch having 2 poles, one normally open and one normally  
closed, is furnished, so that whichever pole is closed by the  
opening of the door, may be used to actuate the heater.  
(E) Gas Control: The flame safeguard is Fireye UVM- 1  
F,whichutilizesaflamescannerwithanultraviolet-sensi-  
tive gas discharge tube to monitor visually both pilot and  
main flame. At any time that it senses no flame, it de-  
energizes the automatic gas valve. (UL-FM approved)  
VII. INSTALLATION (GAS PIPING)  
(See Section Mounting Position Plumbing)  
CAUTION: When making up gas piping, be sure all valves are  
inahorizontalportionofthegasline, withvalvebodyproperly  
positioned:  
With this unit, if main burner goes off after ignition, or if pilot  
fails to ignite at startup after an approximate 5-second trial-  
for-ignition, anexternalrelay(CR)de-energizestheflamesafe-  
guard (CRE), and lights the small green “TURN RESET” pilot  
light. If this happens, turn the remote selector to “OFF/RE-  
SET” then back to “WIN” to reset CR for another start. Re-  
peatedfailuretoignitemayresultinlockoutoftheCREflame  
safeguard itself, causing small red “LOCKOUT” pilot to light.  
This button must then be reset at the control cabinet before  
another try-for-ignition can be made. If electric power to the  
controlcircuitfailsforanyreason, whetherintentionaloroth-  
erwise, andnomatterhowbriefly, theflamesafeguardgivesa  
safe-startcomponentcheckwhenpowerisrestored. Ifaflame  
simulating component failure exists it will not proceed to the  
ignitioncycleandwillnotenergizethemaingasvalve.  
(A) Main safety valve actuator may be in any position.  
(B) Pilot gas valve mounts in any position except with  
solenoidinverted(verticallydown).  
(C) Secondary safety valve must have the solenoid up-  
right, no more than 5º out of plumb, in a horizontal gas  
line.  
(D) Vent valve may be mounted in any position.  
(E) Regulator may be removed and reinstalled further  
upstream in the gas line, but no further than a few feet  
from the heater. Regulators may be installedinanyposi-  
tion,except donotinstallaMaxitrollowpressureregula-  
torinavertical-upgasline.  
The flame safeguard senses first the presence of pilot flame.  
Then, afterthemainautomaticvalveopens, thepilotisinter-  
rupted and main flame only is monitored. If main flame fails  
after pilot is interrupted there will be a 5 second trial for re-  
ignition per 2nd preceding paragraph.  
3
 
X. MAINTENANCE  
(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.  
(Note: See wiring diagram for part number and manufacturer  
of any control component. See manufacturer’s instruction  
sheetsformoreinformation.)  
(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.  
(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  
anelectricallyoperatednormally-openvalvetakesofflat-  
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.)  
(B) Burner: Side plates and their air holes should be  
checked periodically,tobesurethesepartsarenotfouled  
orplugged.  
(C) Burner Adjustment: (See Operation).  
IX. 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.  
GAS  
SUPPLY  
PRESSURE  
(in. w.g.)  
MODEL B-22, 6500 CFM  
(E) Scanner: Remove scanner occasionally,cleanlens,  
and be sure that mounting pipe nipple is clear of insects  
anddirt.  
1000’S  
BTU/HR  
FINALTEMP.  
(ºF)*  
RISE  
(ºF)  
5”  
6”  
7”  
8”  
700  
765  
820  
99  
169  
179  
187  
(F) SparkIgnitor:Ignitiontakesplacebymeansofaspark  
jumping from the ignitor to the side plate of the burner.  
The spark gap should be 1/8" to 3/16" (. 12" -. 19"), and  
locateddownstreamofanairmixinghole, sothatthereis  
agas-airmixturetobeignited. Checkforcarbonbridge”  
between electrode and burner which may short out spark  
andpreventignition.  
109  
117  
7” MAX. RECOMMENDED  
GAS  
SUPPLY  
PRESSURE  
(in. w.g.)  
MODEL B-24, 7900 CFM  
1000’S  
BTU/HR  
FINALTEMP.  
RISE  
(ºF)  
(ºF)*  
XI. TROUBLESHOOTING  
5”  
6”  
7”  
8”  
790  
865  
930  
990  
92  
162  
First check for loose wiring connections.  
Then check the following for specific symptom:  
101  
109  
116  
171  
179  
186  
(A) Fan Won’t Start -  
(1) Selector in “OFF” position.  
* Based on 70º F. inlet temperature.  
(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-  
ingataleak-testconnection. Table 1 shows performance  
atvariousinletpressures.  
(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.  
(B) Pilot Adjustment: This heater is equipped with inter-  
ruptedpilot;i.e.,aftermainburnerignites,pilotiscutoff.  
Scanner then senses main flame only. Pilot flame was  
properlyadjustedatthefactory.Field adjustment is pos-  
sible by removing the protective cap and using a screw-  
driverwithasmallbit.  
(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.  
4
 
TROUBLESHOOTING  
SYMPTOMS  
CAUSE  
FAN WON’T START  
1)  
2)  
Selector in “OFF” position  
Check 3-phase line leads for power across all 3 phases  
(If one line is dead, check fuses or breaker in main  
disconnect)  
3)  
4)  
Check fuse on control circuit transformer  
Try “SUM” setting. If fan runs, but won’t run on “WIN”,  
check 1THS outdoor thermostat(if used) for open R-B  
contact; check limit switch on door for open-contact.  
Check overload relay on fan starter. Iftripped,reset. If  
relay continues to trip, check motor full load amps versus  
M starters overload relays setting (adjustment dial on the  
frontofstarter). See manufacturers instruction sheet.  
5)  
FAN OPERATES, GAS  
PILOT WILL NOT IGNITE,  
GREEN “TURN RESET”  
DOES NOT LIGHT  
1)  
2)  
Selector in “SUM” position. Turn to “WIN”  
Check wire 6 to ground 115 V (defective selector switch or  
wiring to same)  
Check wire 7 to ground (bad 13-14 contactinstarter  
9 to ground (bad R-W contact lo-gas switch)  
10 to ground (bad R-B contact in hi-gas switch)  
11 to ground (bad 4-5 contact in control relay)  
12 to ground (bad C-NO contact in airflow switch; pressure  
setting too high, turn adjustment screw CCW until switch  
trips; clogged tubing in airstream)  
3)  
4)  
5)  
6)  
7)  
8)  
9)  
13 to ground (reset Thermodisc, inside “handy-box”)  
Check toggle switch in mounting base of Fireye (must be  
leftinONposition)  
FAN OPERATES, GAS  
PILOT WILL NOT IGNITE,  
GREEN “TURN RESET”  
LIGHTS CONTINUOUSLY  
WHENEVER FAN RUNS  
1)  
2)  
Defective time delay TDR. (Pull from socket, turn RESET,  
and try again)  
(IRI type only) - One or both gas pressure switched tripped.  
Press reset lever. Iflow-pressure can’t be reset, check for  
cause of inadequate pressure. Check supply pressure aheadof  
regulator, if pressure exceeds rating of regulator,it may pass no gas or  
failtoregulate.  
FAN OPERATES, GAS  
PILOT WILL NOT IGNITE,  
GREEN “LOCKOUT”  
1)  
2)  
Press reset button on Fireye  
If Fireye won’t reset, check for presence of continuous gas  
pilotflame  
LIGHTS CONTINUOUSLY  
WHENEVER FAN RUNS  
CAUTION - Inthiscaseturnoffmanual cock in pilot  
linebefore stoppingfan. Then investigate cause of  
pilot valve 1V sticking open  
3)  
If Fireye can be reset, but on next try-for-ignition, “TURN RESET”  
lights, refer to next sections. If “LOCKOUT” lightsrefertolast  
symptom.  
5
 
TROUBLESHOOTING  
SYMPTOMS  
CAUSE  
FAN OPERATES, LITTLE  
OR NO PILOT FLAME, AND  
“TURN RESET” LIGHTS  
AFTER 5 SECONDS  
1)  
2)  
3)  
Check gas pilot manual cock; should be leftinopen position  
Check all gas lines for clogging and for purging of entrapped air  
Check for moisture and/or conducting dirt on Sparktrode; check  
electrode for carbon “bridge” to burner, which may short out ignition  
spark  
4)  
Check for adequate pilot flame. Adjust needle valve at burner if  
necessary.  
FAN OPERATES,  
1)  
2)  
3)  
Check all manual cocks in main gas line; these should be left open  
innormal position  
Check scanner; remove and clean lens; check mounting pipe nipple  
for clogging insects,dirtorrust  
W ith selector in “WIN” but unit not operating (i.e. door switch open-  
contact with door closed), hold match or lighter flame in front of  
scanner. Flame relay in Fireye chassis should pull in with audible  
“click”. If not, proceed to next step  
PILOT IGNITES NORMALLY,  
THEN GOES OUT AS  
“TURN RESET” LIGHTS  
CAUTION -Before proceeding to next steps, turn selector to “OFF”,  
make the changes suggested, and then return the selector to “WIN”.  
This is important, because in “WIN” position, the Fireye is energized  
and electrical shock could result  
4)  
5)  
1)  
2)  
Detach #20 and #21 leads from installed scanner,attach a known  
good scanner to terminals #20 and #21, and repeat previous step.  
If flame relay now pulls in, install new scanner. Ifnot,re-installleads  
from original scanner and proceed to next step.  
Repace Fireye chassis, inside control cabinet, with a known good unit,  
and repeat step 3. If flame relay still does not pull in, have scanner  
and chassis checked by Fireye distributor or by Berner.  
FAN OPERATES,  
W ith fan operating momentarilyjumpercircuit#7to#8. This should  
result in control relay CR pulling in, lighting “TURN RESET” pilot and  
extinguishing “LOCKOUT”. If so, insert new TDR relay (Amperite  
115NO5). If not proceed to step 2  
W ith fan operating, check for 115volts across circuits #8 and #2  
(at “coil” connections of CR control relay). If no voltage, jumper per  
step1. Ifstillnovoltage backtrack through circuits8, 7, 6and 5 to  
determine where break in circuit exists.If115 volts is measured  
but relay does not pull in, or if relay does pull in but “LOCKOUT” remains  
lit, replace CR relay  
PILOT IGNITES NORMALLY,  
THEN GOES OUT AS  
“LOCKOUT” LIGHTS  
3)  
After either steps 1 or 2 corrective action has been taken, continue with  
last two symptoms.  
6
 

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