Sediment Trap Assembly Instructions; Heater Control Instructions - L.B. White Therma Grow Greenhouse HW220 Owner's Manual And Instructions

SEDIMENT TRAP ASSEMBLY
Assemble the tee, nipples and cap together and tighten
securely. See Fig. 8. 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.
HEATER CONTROLS
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 factor y.
Connection with a thermostat or building control is
required for further operation. The following instructions
provide 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 diagrams 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
A. Two Stage Thermostat
B. Single Stage Thermostat
1. Operate on First Stage Heat Only
2. Operate on Second Stage Heat Only
C. Building Controller Connections - Heating (Using Non-
Powered Contacts)
1. Operate on First Stage Heat Only
2. Operate on Second Stage Heat Only
3. Operate Both Stages of Heat
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.
11
FIG. 8
TO GAS CONTROL
VALVE INLET
The heater incorporates a manual heat - vent switch. When
in the 'heat' position, the heater operates normally. When
in the 'vent' position, the heater fan operates continuously.
In the 'vent' mode, the heater then supplements or provides
air circulation within the 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 diagrams within this manual or on
the heater.
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
Page
Operate on First Stage and Second Stage Heat
11
12
12
BLACK
13
GREEN
GROUND
24V
TRANSFORMER
120 V
NIPPLE
HOSE ADAPTER
TEE
NIPPLE
CAP
2 STAGE
THERMOSTAT
YELLOW
RED
RED
BLUE
RED
IND
L1
HSI
HSIG
L2
W
YELLOW
PSI
IGNITION CONTROL
FSI
BROWN
GV
PSO
FSG
C
GAS CONTROL VALVE
GREEN
C
HI
BROWN
LO
HIGH LIMIT
SWITCH