Shut-Down Instructions; Cleaning Instructions; Maintenance Instructions - L.B. White Therma Grow HW120 Manuel Du Propriétaire

5. The gas control valve in the PLUS model is a two
stage control. When a call for heat occurs, the valve
will open to its first stage rate. Depending upon
temperature requirements and temperature control
setting, the valve will then either remain at first stage
heat rate before the temperature control is satisfied,
or the valve will open completely to its second stage
capacity. If the valve opens to its second stage
capacity, it is designed to revert back to its first stage
heat rate before controller shuts heater down.
6. Do not exceed input rating stamped on nameplate
or manufacturer's recommended burner orifice
pressure for size orifice(s) used. Make certain that
the primary air supply to main burner is open and
free of dust, dirt and debris for complete, proper
combustion.

Shut-Down Instructions

If the heater is to be shut down for cleaning, mainte-
nance or repair, follow steps 1 - 5. Otherwise, simply
turn thermostat to "off" or "no heat" for standard shut
down.
1. Close all manual fuel supply valves.
2. With the heater lit, allow heater to burn off excess
fuel in gas supply hose.
3. Turn the indicator on the gas control to "off".
4. Turn thermostat to "off" or "no heat" position.
5. Disconnect the heater from the electrical supply.

Cleaning Instructions

WARNING
Fire, Burn and Explosion Hazard
■ This heater contains electrical and mechanical
components in the gas management, and safety
systems.
■ Such components may become inoperative or
fail due to dust, dirt, wear and aging.
■ Periodic cleaning and inspection as well as
proper maintenance are essential to avoid
serious injury or property damage.
1. Before cleaning, shut off all gas supply valves and
disconnect electrical supply.
2. At least once a year give the heater a thorough
cleaning, preferably before the beginning of the fall
Therma Grow™ Greenhouse Heaters
heating season. At that time, remove the fan and
motor assembly and brush or blow off the fan wheel.
Additionally, ensure the burner casting and orifice are
free of dust accumulation, insect nests, webs, etc.
Do not use a pressure washer, water, or liquid
cleaning solution on any heater components. Use
of a pressure washer, water, or liquid cleaning
solution on the control components can cause
severe personal injury or property damage due to
water and/or liquids:
n In electrical components, and wires causing
electrical shock or equipment failure.
n On gas control valves causing corrosion which
can result in gas leaks and fire or explosion from
the leak.
Clean all internal components of the heater with
pressurized air, a dry brush, or a dry cloth.
Maintenance
Instructions
1. The area surrounding the heater shall be kept clear
and free from combustible materials, gasoline, and
other flammable vapors and liquids.
2. Have your gas supplier check all gas piping annually
for leaks or restrictions in gas lines.
3. Regulators must be periodically inspected to make
sure the regulator vents are not blocked. Debris,
insects, insect nests, snow, or ice on a regulator
can block vents and cause excess pressure at the
heater.
4. Regulators can wear out and function improperly.
Have your gas supplier check the date codes on all
regulators installed and check delivery pressures to
the heater to make sure that the regulator is reliable.
5. Check all wiring associated terminals and electrical
components within the heater for corrosion, frayed
or cut insulation, tight connections, etc. Repair or
replace as necessary.
Owner's Manual • Therma Grow™
WARNING
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