L.B. White Therma Grow 120 User manual

WORLD PROVIDER - INNOVATIVE HEATING SOLUTIONS
411 Mason Street, Onalaska, WI 54650 • 800-345-7200 • 608-783-5691 • 608-783-6115 (fax) • www.lbwhite.com
Indoor Ventilation Kit
Therma Grow 120/220
120/220 Plus
View these instructions online at www.lbwhite.com
Tools required:
-- Electric drill with 1/8 in. drill bit
-- Electrical wire stripping / crimping tool
-- 1/4 in. and 5/16 in. nut drivers
-- Standard screwdriver
-- Small adjustable wrench
-- Saw
-- Level
Materials required:
-- Sealant caulk
-- Framing material (if needed)
-- Approved electrical wiring of proper gauge
-- Electrical ttings
-- Electrical junction box
-- Electrical tape
INSTALLATION INSTRUCTIONS
Qualifications for installation:
• You must read and understand these instructions before beginning the installation.
• You must have sufcient experience to install the kit and test for proper operation.
• All wiring must be done in accordance with local codes. In absence of local codes, follow ANSI/NFPA 70,
National Electrical Code.
General Information
Proper installation for heaters located within the greenhouse requires air exchange as follows:
An exhaust fan capable of providing the following discharge air:
-- Therma Grow™ 120/120 Plus heaters: 300 cfm.
-- Therma Grow™ 220/220 Plus heaters: 550 cfm.
A shuttered air inlet louver of 120 sq. in. area used with an L.B.White specied air inlet duct kit with restrictor plate.
The inlet shutter and exhaust fan must be electro-mechanically operated and electrically interlocked with the heater.
Discussion
This kit consists of a properly sized motorized air inlet shutter, exible duct, and exhaust fan. All items must be installed when
the heater is located within the greenhouse.
Kit Contents:
DESCRIPTION QTY.
Instruction 1
Inlet hood 1
Bag of terminals and hardware 1
Air inlet with transition duct 1
Motor, air inlet 1
Black 8 1/2 in. wire 1
Air proving switch 1
Exhaust fan 1
Duct kit (12 ft. x 6 in.) 1

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Indoor Installation Kit • Therma Grow
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A. Air Inlet Location
Ideally the air inlet shutter should be located as
shown in Fig.1A, 1B, and 1C. However, it may
also be installed in any other location on the end
or side wall, especially if water, gas, or electrical
lines create interference. See Fig.1D for alternate
locations at end or side walls.
Regardless of air inlet location, the exible duct
(included) must be installed. The duct must be cut
to proper length to prevent sagging and kinks from
preventing proper air ow to the heater. Separate
duct installation instructions are provided in the
duct kit.
FIG. 1A Blower Outlet View
HEATER AIR INLET
AIR INLET
TRANSITION
CENTERED
INTERIOR EXTERIOR
1 1/2 FT MAX.
MOTORIZED AIR INLET
ALIGNED TO AIR INLET
IN BASE OF HEATER
1 1/2 FT MAX.
OUTSIDE
AIR SOURCE
FIG. 1B Underside View
FIG. 1C Side View
FIG. 1D Alternate Air Inlet Locations
END WALL
DUCT COLLAR INSTALLED
TO AIR INLET OF HEATER
CLAMP
CLAMP
COLLAR WITH COVER
INSTALLED TO AIR INLET
10 FT MAX. FROM AIR INLET OF HEATER TO AIR INLET
ALTERNATE INLET
LOCATIONS
WALL
MOTORIZED AIR
INLET SHOWN
WITHOUT DUCT
ATTACHED FOR
CLARITY
Air Inlet Size:
Therma Grow™ 120/120 Plus: 13
½ in. x 13 ½ in. Therma Grow™
200/220 Plus: 15 ½ in. x 15 ½ in.
Provide a square and level opening.
Create suitable framing to mount the
inlet to the structure if necessary.
DUCT WITH COLLAR
CENTERED TOAIR
INLET OF HEATER
HEATER
END WALL
OUTSIDE AIR SOURCE
AIR
DISCHARGE
1 1/2 FT. MINIMUM
DUCT ATTACHED
TO AIR INLET OF
HEATER, AND
CUT TO PROPER
LENGTH. (NO KINKS
OR SAGGING).
GROUND
18 IN.
MIN.*
2 FT. MIN.
OUTSIDE AIR
SOURCE
CENTERED AIR
INLET INTERIOR
EXTERIOR
* THE MOTORIZED AIR INLET MUST BE
INSTALLED A MINIMUM OF 18 IN. ABOVE THE
GROUND OR TO A HEIGHT NECESSARY TO
PREVENT BLOCKAGE FROM OBSTRUCTIONS
(EXAMPLES: SNOW, EXTERIOR PLANT
GROWTH, ETC.)
CUT DUCT TO PROPER LENGTH,
NO KINKS OR SAGGING
DUCT MUST BE INSTALLED REGARDLESS OF AIR INLET LOCATION

Indoor Ventilation Kit
Indoor Installation Kit • Therma Grow
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CUT DUCT TO PROPER LENGTH,
NO KINKS OR SAGGING
B. Air Inlet Installation and Assembly
(Refer to Fig. 2)
1. From the exterior, slide the air inlet through the
opening. The inlet’s mounting ange must be located
against the at exterior of the building. Mark and drill
1/8 in. pilot holes at all ange screw holes. Secure
the inlet to the wall with the screws provided. Seal the
inlet’s ange edges.
2. Evenly position the air inlet hood over the inlet at
the exterior of the building. Mark and drill 1/8 in. pilot
holes at all ange holes. Secure the inlet hood to the
exterior wall with screws from kit. Seal the hood’s
ange edges.
3. Assemble the motor with bracket to the air inlet
transition sleeve. Use the nuts and screws from the kit.
Do not tighten at this time
4. Assemble the motor arm to air inlet’s linkage arm. See
detail in Fig. 2. Tighten the screw securely.
5. Push the motor with bracket toward the wall until slots
in bracket stop against mounting screws, and shutters
are fully closed. Securely tighten all motor bracket
screws. See detail in Fig. 2.
6. Mount the air proving switch assembly to the transition
sleeve. Tighten the mounting screws securely.
C. Locating and Installing the Exhaust Fan
1. The exhaust fan must be located at an upper area
of the end wall opposite from the heater, preferably
in an area higher than the heater’s discharge. See
Fig. 3. The exhaust fan does not need to be directly
in line to the heater.
2. Provide a 10 1/4 in. x 10 1/4 in. square and level
opening. Suitable framing may be required for
mounting.
3. Position the kit through the opening from the inside of
the greenhouse. The shutters are gravity operated and
must be installed so the shutters drop to closed after
being lifted open.
-- Check the assembly with a level before installing.
-- Mark and drill 1/8 in. pilot holes at all locations in the
exhaust fan’s mounting ange.
-- Secure with 1/2 in. screws from the kit. See Fig. 4.
-- Seal the appropriate areas to prevent water entry.
D. Wiring the Exhaust Fan and Air Inlet
Shutter Motor to the Heater
1. Select a location for an electrical junction box near
the heater. Mount the junction box.
2. Open the heater’s control box. Remove the hole plug
from the control box base and the wire cap(s) from
the wire(s) labeled TO VENTILATION MOTORS.
See Fig. 5.
3. Route an appropriate length and gauge of electrical
wiring from the junction box up to the bottom of the
control box and through this hole.
4. Connect an appropriate length and gauge of electri-
cal wiring to the leads of the exhaust fan motor and
air inlet shutter motor.
-- Route this wiring to the electrical junction box and
connect it to the wiring leading to the heater’s control
box.
-- Use wire nuts provided.
-- Refer to the appropriate electrical connection diagram
on page 6.
5. Proceed to further wiring instructions, page 4, for
the Therma Grow™ 120 Plus/220 Plus or Therma
Grow™ 120/220 heaters.

Indoor Ventilation Kit
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Indoor Installation Kit • Therma Grow
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FIG. 2
FIG. 3
LOCATE POWERED EXHAUST FAN KIT
AT OPPOSITE END FROM HEATER
AIR FLOW
HEATER MOUNTED
INSIDE GREENHOUSE
GAS
SUPPLY
INLET HOOD
MOTOR
MOT
OR ARM
#10-32 X 1 1/4
MACHINE SCREW
INSERT, 10-32
WASHER
WASHER
SPACER #10 X 7/8
AIR PROVING
SWITCH
SCREW 1/4 X 3/8 (2) NUT 10-32 WITH
STAR WASHER (4)
MOTOR WITH
BRACKETS
TRANSITION
SLEEVE
SCREW 10-32 X 3/8 (4)
INTERIOR
WALL
#10 X 1/2 SCREW (22)
PUSH MOTOR AND
BRACKET TOWARD
WALL THEN TIGHTEN
SCREWS
SHUTTER
LINKAGE
ARM

Indoor Ventilation Kit
Indoor Installation Kit • Therma Grow
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FIG. 4
FIG. 5
Therma Grow ™ 120 Plus or 220 Plus
Heaters
Connect the wiring from the junction box to the heater’s
control box as follows:
a. Black and white wires to wiring labeled TO VENTILA-
TION MOTORS. See Fig 5
-- Use wire nuts provided in the kit.
b. Green ground wire to ground screw.
-- Use the spade terminal from the kit.
Proceed to Section E.
Therma Grow™ 120 or 220 Heaters
1. Disconnect the black motor wire at the ignition control
terminal marked IND. See Fig.6.
FIG. 6
2. Connect the kit’s 8 1/2 in. black wire and the motor
wire to the kit’s three way terminal. See Fig.7. Connect
this assembly to terminal IND on the ignition control.
FIG. 7
3. Connect the wiring from the junction box to the
heater’s control box as follows. Use wire nuts supplied
for a. and b.:
a. Black wire to the stripped end of the black 8 1/2 in.
wire.
b. White wire to the white wire in the control box labeled
TO VENTILATION MOTORS.
c. Green ground wire to the ground screw.
-- Use the spade terminal from the kit. Proceed to
Section E.
E. Wiring the Air Proving Switch at Air Inlet
to the Heater’s Contol Box
1. Disconnect the blue wire from terminal PSI on the igni-
tion control. Remove the terminal from this lead and
strip back its insulation about 1/4 in. See Fig. 8.
FIG. 8
DRILLED PILOT
HOLES
INNER WALL
HOLE PLUG
WIRE CAPS
3 WAY TERMINAL
MOTOR WIRE
8 1/2 IN.
BLACK WIRE
#10 X 1/2
SCREW

Indoor Ventilation Kit
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Indoor Installation Kit • Therma Grow
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2. Make two electrical leads of proper length and
gauge. Attach terminals from the kit to these leads.
See Fig. 9.
FIG. 9
LEAD A
LEAD
B
BUTT SPLICE
1/4 IN FEMALE
TERMINAL, 90º FLAG
PROPER LENGTH AND
GAUGE WIRE
3/16 IN
FEMALE TERMINAL
3. Connect the leads as follows. Refer to appropriate
wiring diagram on page 6.
Lead A
-- Connect the end with the 3/16 in. terminal to either
terminal of air proving switch at the air inlet.
-- Route the other end with the butt splice up through
the bottom of the control box
-- Connect the butt splice to the blue lead in the control
box which had its terminal removed.
Lead B
-- Connect the end with 3/16 in. terminal to remaining
terminal on air proving switch at air inlet.
-- Route the other end of this lead up through the bot-
tom of the control box.
-- Connect the 1/4 in. ag terminal from the kit to this
wire and connect this to terminal PSI on the ignition
control.
F. Completion
1. Secure all the wiring at the junction box and control
box with electrical ttings capable of preventing wire
abrasions and providing protection against dirt and
moisture entry.
2. Verify the completed wiring matches the appropriate
wiring diagram on page 6.
3. Connect the heater to its electrical and gas supplies
and test the installation by starting the heater.
NOTE: Connection with a thermostat or building
controller is required for further operation. Refer to
heater’s Owner’s Manual for control wiring instruc-
tions. Ensure 115 VAC is supplied to the exhaust
fan motor and air inlet shutter motor. Both will
operate when the heater starts.
a. On start-up, the heater’s fan motor will run for 5
seconds. During this time the air inlet shutter motor
will open the inlet, and the exhaust fan will start.
b. After 5 seconds, the heater’s fan motor will stop.
When the heater’s fan motor stops, the shutter
motor will close the air inlet and the exhaust fan
motor will stop.
Note: This is normal operation. The
ignition control is checking the
air proving switch at the air inlet
and in the heater for proper
operation before allowing an
ignition trial to continue.
• Shortly after the heater ignites, shut the heater
down.
-- The exhaust fan motor will stop.
-- The motor on the air inlet will gradually close the
shutters.
-- Ensure the inlet and exhaust fan shutters close
completely and do not bind.
4. Install the air proving switch cover over the
switch assembly at the air inlet. See parts
schematic FIG. 10.
5. Wrap the butt splice and wire nuts with electrical
tape.
6. Close and latch the control box and set the
greenhouse thermostat to desired temperature.
7. Ensure the motorized air inlet, the heater’s
air inlet, and exhaust fan are kept free of any
blockages.
8. Keep these instructions for future reference.
G. Parts Ordering Information
See Fig.10 for inlet shutter components.
The exhaust fan is available only as a complete
assembly. Exhaust fan part numbers:
-- Therma Grow™ 120 and 120 Plus: 24742
-- Therma Grow™ 220 and 220 Plus: 24741
All parts referred to in this instruction are available
by contacting L.B. White Co., LLC at (800) 345-
7200 from 7:00 a.m. to 5:00 p.m. Central Standard
Time.

Indoor Ventilation Kit
Indoor Installation Kit • Therma Grow
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FIG. 10
Therma Grow ™ 120 Plus and 220 Plus
Wiring the Air Inlet and Exhast Fan
500-26013 SPRING
500-26015 LEVER WITH
SCREW, SPACER,
AND WASHERS
500-26033
AIR PROVING SWITCH
WITH BRACKET, COVER,
AND SCREWS
500-25994 INLET SHUTTER
WITH TRANSITION
500-26034 INLET HOOD
WITH SCREWS
500-25314 SHUTTER MOTOR
500-26012 BRACKET WITH
MOUNTING SCREWS AND NUTS
LEAD "A"LEAD "A" BUTT SPLICE WIRE FROM IGNITION
CONTROL WITH
TERMINAL REMOVED
IND L1 HSI HSIG L2 W PSI FSI GV PSO FSG C
AIR INLET AIR PROVING SWITCH
LEAD "B"
HEATER AIR PROVING SWITCH
EXISTING
WIRING
FROM
CONTROL
BLACK (TO
VENTILATION
MOTORS)
BLACK
RED
BROWN
BLACK
WHITE
GREEN
NEUTRALNEUTRAL 115 VAC115 VAC
BLACK
WHITE
GREEN
GROUND
GROUND
EXHAUST FAN CONNECTIONS
AIR INLET SHUTTER MOTOR CONNECTIONS
WHITE
WHITE (TO
VENTILATION
MOTORS)
JUNCTION
BOX

Therma Grow ™ 120 and 22
Wiring the Air Inlet and Exhast Fan
IND L1 HSI HSIG L2 W PSI FSI GV PSO FSG C
EXISTING
WIRING
FROM
CONTROL
BLACK
JUNCTION
BOX
RED
BROWN
BLACK
WHITE
GREEN
BLACK
WHITE
GREEN
GROUND
GROUND
WHITE
WHITE (TO
VENTILATION
MOTORS)
KITS - 8 1/2 IN.
BLACK WIRE
WIRE FROM IGNITION
CONTROL WITH
TERMINAL REMOVED
AIR INLET AIR PROVING SWITCH
HEATER AIR PROVING SWITCH
LEAD "B"
MOTOR
BLACK
THREE WAY
TERMINAL
LEAD "A"
BUTT
SPLICE
NEUTRAL
NEUTRAL 115 VAC
115 VAC
EXHAUST FAN CONNECTIONS
AIR INLET SHUTTER MOTOR
CONNECTIONS
Contact your local L.B. White dealer for replacement parts
and service. You may also call the L.B. White Co., LLC at
U.S. & Canada: 1-800-345-7200, Overseas: 001-608-783-5691
assistance, or email us at [email protected].
Be sure that you have your heater model number and
conguration number when calling.
Service
WORLD PROVIDER - INNOVATIVE
HEATING SOLUTIONS
411 Mason Street, Onalaska, WI 54650
800-345-7200 • 608-783-5691
608-783-6115 (fax)
www.lbwhite.com
150-28705 REV.B