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
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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.
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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. Checkforcarbon“bridge”
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.
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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 starter’s overload relay’s setting (adjustment dial on the
frontofstarter). See manufacturer’s 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
leftin“ON”position)
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.
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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.
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