Gas Control Valve - L.B. White Therma Grow HW120 Manuel De L'utilisateur

1. Remove the following
-- Hose and sediment trap from inlet of gas valve
-- Screws securing valve bracket to heater base.
-- Burner bolt from underside of base.
-- Screws and spacers securing burner casting to
heat chamber.
2. Remove control valve with burner from heater. Turn
the valve/manifold assembly as necessary so orifice
block on manifold can be pulled from the burner
casting venturi port..
3. Replace components as needed.
FIG. 15a
Therma Grow 220 Plus
GAS CONTROL
VALVE
FIG. 15b
Therma Grow 120 Plus
ORIFICE BLOCK AND ORIFICE

GAS CONTROL VALVE

ORIFICE
BLOCK
BURNER
ORIFICE
19