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Gas Fired Door Heater
Model B-22 and B-24
Installation & Maintenance Instructions
BERNER INTERNATIONAL CORPORATION
724-658-3551
© Copyright 2001 Berner International Corporation
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1-800-245-4455
New Castle, Pennsylvania
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www .berner .com
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airdoors@berner.com
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I. DESCRIPTION
The Berner Gas-Fired Door Heater is designed to instantly
direct a stream of heated air toward a large door opening,
when the door is opened in cold weather. It utilizes a ring type
burner operating on natural gas. The propeller is a special
Ductaxial solid aluminum casting, direct connected to an industrial duty , tot ally enclosed motor .
The burner is the product of many years of experience in the
crop drying field with direct-fired burners.
Products of combustion, which are discharged directly into
the main airstream, consist of carbon dioxide and water vapor . At maximum rated heat output the concentration Of C0
is approximately 2000 PPM (parts per million) compared with a maximum allowable* of 5000 PPM.
IV. GAS PRESSURE REGULATO R
Gas supply pressure must be specified at the time of ordering, so that the proper regulator can be furnished to reduce
line pressure to 6” - 8” W . C.
It is suggested that a 1/8" or 1/4" I.P.S. test connection be
provided in the gas supply line upstream of the regulator to
facilitate taking pressure readings at time of startup and adjustment of burner equipment.
Make sure that the regulator is installed in the line with the
arrow on the body pointing in the direction of the flow of the
fuel.
With the regulator properly installed in the line, the following
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procedure is suggested when ready to light off and adjust the
burner.
Although the water vapor of combustion is added, relative humidity is actually reduced, owing to the heat that is added to
the air . At maximum rated heat output, and assuming 60º F.
saturated entering air , the discharge air is less than 5% RH.
II. MOUNTING POSITIONS
(A) Burner: The standard unit may be installed at any
angle between horizont al and vertical down airflow . The
control cabinet is on the left-hand side, facing the airstream. The back panel of the cabinet must lie in a vertical plane; (i.e., the burner house cannot be rotated, thus
rolling the cabinet toward the top or bottom of the burner
house).
(B) Plumbing: The gas piping elbows up and into the
burner house on the bottom centerline. During installation, by loosening the union just out side the heater, the
piping train may be rotated to any desired direction, provided valves are properly oriented.
(See CAUTION )
III. INSTALLATION (MECHANICAL)
One Door Heater will handle up to approximately a 12' x 15'
door opening. Larger opening require two or more heaters.
(A) Remove the “top cap” of the regulator and check for
shipping block or rod installed between spring and top
cap. Remove, if found.
(B) Remove plug, in vent opening of diaphragm housing.
(Connect vent to atmosphere, if required by plant or insurance regulations. See Suggestions for Regulator Venting).
The setting of the spring beneath the “top cap” on the regulator determines the outlet pressure. Screwing in on it increase
the outlet pressure. Screwing out reduces the outlet pressure. The outlet pressure from the regulator will not necessarily be the same at full fire as under static conditions of no
flow . Therefore, when adjusting gas pressure to very heat
output, do so with the heater in operation. (See Maintenance.)
Although most regulator problems in the field have to do with
insufficient pressure at the outlet (usually because of line
losses), it is well to know what to do in case the regulator
won’t deliver a low enough pressure: Turning it upside down
in the line will frequently do the trick.
V. SUGGESTIONS FOR REGULATO R
VENTING
(See also Safety Devices on vent valve)
CAUTION: No door heater can substitute for a Tempered
Intake Air Unit. If in-plant negative pressure exists because
of exhaust ventilation, makeup air must be provided before a
door heater can be expected to function properly. See your
Berner representative.
The heater should be aimed at a spot on the floor about four or
five feet inside, and midway across, the door. At the inlet end
there should be no obstructions to the airflow closer than 20"
- 24"; at the outlet end, of course, there should be nothing
obstructing the airstream. Around the sides of the heater
there should be no combustible material closer than three
feet.
One purpose of the vent connection is to provide a safe means
of venting gas if the regulator diaphragm should fail. The vent
also provides relief from the space above the diaphragm as it
moves during regulation. A restriction in the vent line can
result in poor regulator performance.
The vent line should normally be piped outside the building,
with as short a run of pipe as possible. There should be a
minimum number of bends, and the pipe should be as large
as practical, using the vent hole size as a guide. When tubing is used (on the smaller regulators), care must be exercised to avoid sharp bends and the resultant reduction in area.
Grouping vent lines together into a common header is not
normally recommended. If they must be grouped, the header
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cross-sectional area should be at least equal to the sum of
the individual vent areas.
The outside end of the vent line should either have a weatherproof vent cap or should be directed downward for weather
protection. It should also be screened to prevent foreign material or insect s from entering the line. Naturally, the end of
the line should be located in an area where it is safe to release gas.
A high percentage of regulator problems is due to improper
venting. Remember the space over the diaphragm must be
able to breathe for proper regulation. If there is any regulation
problem, disconnect the vent line at the regulator to see if
proper venting is the solution. Then look for undersized lines,
crimped tubing, clogged lines, back pressure caused by draft
effect at end of vent or pressure effect from other regulators in
a grouped system.
VI. INSTALLATION (ELECTRICAL)
All internal electric wiring is factory installed. It is only necessary to connect main power leads to terminals LI - L2 - L3 of
the tenminal strip inside the cabinet, and to wire between remote st ation, doorswitch, and heater .
The remote station may be installed at any location for convenience in switching the heater to “OFF” or “SUM” for warm
weather.
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.
VII. INSTALLATION (GAS PIPING)
(See Section Mounting Position Plumbing)
CAUTION: When making up gas piping, be sure all valves are
in a horizontal portion of the gas line, with valve body properly
positioned:
(A) Main safety valve actuator may be in any position.
(B) Pilot gas valve mounts in any position except with
solenoid inverted (vertically down).
(C) Secondary safety valve must have the solenoid upright, no more than 5º out of plumb, in a horizontal gas
line.
(D) V ent 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 inst alled in any position, except do not install a Maxitrol low pressure regulator in a vertical-up gas line.
A manual cock (not furnished) should be piped in ahead of the
regulator . (See schematic piping on wiring diagram.)
VIII. SAFETY DEVICES
(A) Gas Pressure Switches*: T wo U.L. listed gas pressure supervising switches are used, to shut off gas if pressure falls below or rises above the proper operating range.
(See wiring diagram for proper setting.) Switches are preset at the factory during checkout.
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 of f manually, 1PS must be reset.
(B) Safety Shut-Off Valve: This heater is equipped with
a motor operated gas valve having closing spring that exerts a force in excess of 5 lbs. It is a fast-open, instant
close valve meeting the requirements of FM, UL, AGA
and CSA.
(C) Hi-Temperature Limit: 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.
(D) Airflow Switch: A UL-FM approved differential pressure switch in the control cabinet senses velocity plus
st atic pressure of the airflow from the propeller .
This air pressure closes the switch contact to power the
gas system, thus assuring that the fan is on before the
gas can ignite.
(E) Gas Control: The flame safeguard is Fireye UVM- 1
F, which utilizes a flame scanner with an ultraviolet-sensitive gas discharge tube to monitor visually both pilot and
main flame. At any time that it senses no flame, it deenergizes the automatic gas valve. (UL-FM approved)
With this unit, if main burner goes off after ignition, or if pilot
fails to ignite at startup after an approximate 5-second trialfor-ignition, an external relay (CR) de-energizes the flame safeguard (CRE), and lights the small green “TURN RESET” pilot
light. If this happens, turn the remote selector to “OFF/RESET” then back to “WIN” to reset CR for another start. Repeated failure to ignite may result in lockout of the CRE flame
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
control circuit fails for any reason, whether intentional or otherwise, and no matter how briefly, the flame safeguard gives a
safe-start component check when power is restored. If a flame
simulating component failure exists it will not proceed to the
ignition cycle and will not energize the main gas valve.
The flame safeguard senses first the presence of pilot flame.
Then, after the main automatic valve opens, the pilot is interrupted and main flame only is monitored. If main flame fails
after pilot is interrupted there will be a 5 second trial for reignition per 2nd preceding paragraph.
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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 powered. 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 &
V ent Valves): A second main line gas valve is inst alled
downstream of the primary safety valve. A vent line with
an electrically operated normally-open valve takes off laterally between the two main line valves. This vent line
must be piped to atmosphere outside the building, by the
customer on inst allation (See Suggestions for Regulator .)
IX. OPERATION
GAS
SUPPLY
PRESSURE
(in. w.g.)
5” 700 99 169
6” 765 109 179
7” 820 117 187
8” 7” MAX. RECOMMENDED
GAS
SUPPLY
PRESSURE
(in. w.g.)
5” 790 92 162
6” 865 101 171
7” 930 109 179
8” 990 116 186
* Based on 70º F. inlet temperature.
1000’S
BTU/HR
1000’S
BTU/HR
MODEL B-22, 6500 CFM
RISE
(º F)
MODEL B-24, 7900 CFM
RISE
(º F)
FINAL TEMP.
FINAL TEMP.
(º F)*
(º F)*
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 maintenance 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 factoryinstalled.
(B) Burner: Side plates and their air holes should be
checked periodically, to be sure these parts 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 component s; i.e., the Flame Rod and the Ultra -V iolet Scanner.
See “Maintenance” in manufacturer’s bulletin C-400.
(E) Scanner: Remove scanner occasionally, clean lens,
an d 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. TROUBLESHOOTING
First check for loose wiring connections.
Then check the following for specific symptom:
(A) Fan Won’t Start -
(1) Selector in “OFF” position.
(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 piping at a leak-test connection. Table 1 shows performance
at various inlet pressures.
(B) Pilot Adjustment: This heater is equipped with interrupted 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 a djustment is pos sible by removing the protective cap and using a screwdriver with a small bit.
(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.
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TROUBLESHOOTING
SYMPTO MS CAUSE
FAN WON’T STA RT 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) T ry “SUM” setting. If fan runs, but won’t run on “WIN”,
check 1THS outdoor thermost at (if used) for open R-B
cont act; check limit switch on door for open-cont act.
5) Check overload relay on fan starter . If tripped, reset. If
relay continues to trip, check motor full load amp s versus
M st arter ’s overload relay’ s setting (adjustment dial on the
front of st arter). See manufacturer ’s instruction sheet.
FAN OPERATES, GAS 1) Selector in “SUM” position. T urn to “WIN”
PILOT WILL NOT IGNITE, 2) Check wire 6 to ground 115 V (defective selector switch or
GREEN “TURN RESET” wiring to same)
DOES NOT LIGHT 3) Check wire 7 to ground (bad 13-14 cont act in st arter
4) 9 to ground (bad R-W cont act lo-gas switch)
5) 10 to ground (bad R-B cont act in hi-gas switch)
6) 11 to ground (bad 4-5 cont act in control relay)
7) 12 to ground (bad C-NO cont act in airflow switch; pressure
setting too high, turn adjustment screw CCW until switch
trip s; clogged tubing in airstream)
8) 13 to ground (reset Thermodisc, inside “handy-box”)
9) Check toggle switch in mounting base of Fireye (must be
lef t in “ON” position)
FAN OPERATES, GAS 1) Defective time delay TDR. (Pull from socket, turn RESET,
PILOT WILL NOT IGNITE, and try again)
GREEN “TURN RESET” 2) (IRI type only) - One or both gas pressure switched tripped.
LIGHTS CONTINUOUSLY Press reset lever. If low-pressure can’t be reset, check for
WHENEVER FAN RUNS cause of inadequate pressure. Check supply pressure ahead of
regulator , if pressure exceeds rating of regulator , it may p ass no gas or
fail to regulate.
FAN OPERATES, GAS 1) Press reset button on Fireye
PILOT WILL NOT IGNITE, 2) If Fireye won’t reset, check for presence of continuous gas
GREEN “LOCKOUT” pilot flame
LIGHTS CONTINUOUSLY
WHENEVER FAN RUNS CAUTION - In this case turn off manual cock in pilot
line before stopping fan. Then investigate cause of
pilot valve 1V sticking open
3) If Fireye can be reset, but on next try-for-ignition, “TURN RESET”
light s, refer to next sections. If “LOCKOUT” light s refer to last
symptom.
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TROUBLESHOOTING
SYMPTO M S CAUSE
FAN OPERATES, LITTLE 1) Check gas pilot manual cock; should be lef t in open position
OR NO PILOT FLAME, A N D 2) Check all gas lines for clogging and for purging of entrapped air
“TURN RESET” LIGHTS 3) Check for moisture and/or conducting dirt on S p arktrode; check
AFTER 5 SECONDS electrode for carbon “bridge” to burner, which may short out ignition
sp ark
4) Check for adequate pilot flame. Adjust needle valve at burner if
necessary.
FAN OPERATES, 1) Check all manual cocks in main gas line; these should be lef t open
PILOT IGNITES NORMALLY, in normal position
THEN GOES OUT AS 2) Check scanner; remove and clean lens; check mounting pipe nipple
“TURN RESET” LIGHTS for clogging insect s, dirt or rust
3) W ith selector in “WIN” but unit not operating (i.e. door switch opencontact 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
CAUTION - Before proceeding to next step s, turn selector to “OFF”,
make the changes suggested, and then return the selector to “WIN”.
This is import ant, because in “WIN” position, the Fireye is energized
and electrical shock could result
4) Detach #20 and #21 leads from inst alled scanner , attach a known
good scanner to terminals #20 and #21, and repeat previous step.
If flame relay now pulls in, inst all new scanner. If not, re-inst all leads
from original scanner and proceed to next step.
5) R e p ace 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, 1) W ith fan operating momentarily jumper circuit #7 to #8. This should
PILOT IGNITES NORMALLY, result in control relay CR pulling in, lighting “TURN RESET” pilot and
THEN GOES OUT AS extinguishing “LOCKOUT”. If so, insert new TDR relay (Amperite
“LOCKOUT” LIGHTS 115NO5). If not proceed to step 2
2) W ith fan operating, check for 1 15 volt s across circuit s #8 and #2
(at “coil” connections of CR control relay). If no volt age, jumper per
step 1. If still no volt age backtrack through circuit s 8, 7, 6 and 5 to
determine where break in circuit exist s. If 1 15 volt s i s measured
but relay does not pull in, or if relay does pull in but “LOCKOUT” remains
lit, replace CR relay
3)Af ter either step s 1 or 2 corrective action has been t aken, continue with
last two symptoms.
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