L.B. White HW120 Plus Therma Grow - Manual (Page 11)

NIPPLE
HOSE ADAPTER
TEE
NIPPLE
CAP
TO GAS CONTROL
VALVE INLET
Assemble the tee, nipples and cap together and tighten
securely. See Fig. 7. The sediment trap assembly must
always be mounted in a vertical position. Make sure pipe
thread compound that is resistant to both L.P. gas and
natural gas is used in making all connections. Check all
connections for gas leaks using approved gas leak
detectors. FIG. 7
SEDIMENT TRAP ASSEMBLY
This heater features a two-stage gas control valve and a heat
- ventilation switch. These features expand the capability of
the heater to cost effectively maintain temperature and
likewise enhance air circulation in the greenhouse when
heating is not required.
The two-stage gas control valve provides the ability to more
closely match heat to need - starting at the first stage
(minimum or mid-rating position) and only moving to second
stage (maximum or full rating position) if needed to satisfy
the temperature requirements of the building. This capability
results in less temperature variation in the building and
therefore lower fuel consumption. The heater can be
configured to operate in either single stage or two-stage
mode with either a thermostat or building controller. Note
that the heater is wired to start up and run only in the first
stage position as shipped from the factory. Connection with
a thermostat or building control is required for further
o p e r a t i o n . T h e fo l l ow i n g i n s t r u c t i o n s p rov i d e
interconnections for the two-stage gas control valve in either
single stage or two stage configuration utilizing either a
thermostat or building controller. Before connecting any
thermostat or building control, become familiar with the
heater’s electrical connection diagram. See diagram in this
manual or on the heater. Refer to the index below to select
specific wiring interconnections for the temperature control
device to be used.
Index
Page
A. Two Stage Thermostat 11
B. Single Stage Thermostat 12
1. Operate on First Stage Heat Only
2. Operate on Second Stage Heat Only
C. Building Controller Connections - Heating 12
(Using Non-Powered Contacts)
1. Operate on First Stage Heat Only
2. Operate on Second Stage Heat Only
3. Operate Both Stages of Heat
13
The GreenGro incorporates a manual heat - vent switch.
When in the ‘heat’ position, the heater operates normally.
When in the ‘vent’ position, the heater fan operates
c o n t i n u o u s l y. I n t h e ‘ ve n t ’ m o d e , t h e h e a te r t h e n
s u p p l e m e n t s o r p rov i d e s a i r c i rc u l a t i o n w i t h i n t h e
greenhouse. This heat - vent capability can be controlled by a
building controller. Before connecting to a building controller
for the heat - vent function become familiar with the heater’s
electrical connection diagram. See diagram within this
manual or on the heater. Refer to the index below for specific
wiring interconnection options for the heat - vent capability.
Note: when controlling the heat - vent position with a building
controller, if the building controller is in the ‘vent’ position it
must allow sufficient time for the fan to come to a complete
stop before switching to the ‘heat’ mode.
Regardless of control used:
■
Open the heater’s control box
■
Locate the yellow wire connected from the 24 volt
output of the transformer to terminal W on the ignition
control.
-- Cut this wire at midpoint
-- Strip back insulation on ends 1/2 in.
■
Using proper electrical connectors,connect wiring to
thermostat and gas control valve as shown.
-- Refer to respective diagram
-- Red lead for second stage heat is marked GAS
CONTROL HI.
■
Close and latch the control box when done.
A. Two Stage Thermostat
Operate on First Stage and Second Stage Heat
HEATER CONTROLS
WARNING
Electrical Shock Hazard
■
Disconnect the heater’s electrical supply before
interconnecting the control.
■
Failure to disconnect the electrical supply will result
in electrical shock.
■
Electrical shock will cause severe injury or death.
YELLOW
BLUE
RED
YELLOW
BLACK
WHITE
YELLOW
GREEN
GROUND
BLACK WHITE
LO
C
HI
GREEN
RED RED
GAS CONTROL VALVE
HIGH LIMIT
SWITCH
BROWN GR
OUND
TRANSFORMER
IGNITION CONTROL
2 STAGE
THERMOSTAT
24V
120 V
IND
L1
HSI
HSIG
L2
W
PSI
FSI
GV
PSO
FSG
C
BROWN
BROWN
11