Laars Rheos RHCH, Installation And Operation Instructions Manual

Page: 43 / 60

Rheos Boiler and Water Heater
Page 43
Figure 36. Gas Trains.
Safety
Gas Valve
Modulating Gas
Valve Actuator
Modulating Gas
Valve Body
Manual
Gas Valve
Manual
Gas Valve
Gas Orifice
Low Gas
Pressure
Switch
High Gas
Pressure Switch
Standard and Control Pack C Gas Train
Pressure
Switch
Air Inlet
Transition
Safety
Gas Valve
Modulating Gas
Valve Actuator
Modulating Gas
Valve Body
Manual
Gas Valve
Manual
Gas Valve
Normally Open
Vent Valve
Gas Orifice
Low Gas
Pressure Switch
High Gas
Pressure Switch
Control Packs A and D Gas Train
Pressure
Switch
Air Inlet
Transition
7.2.13 Normally Open Vent Valve
Some Rheos models provide a normally open
vent valve for installations with IRI code requirements.
The valve opens when power is removed from the
safety valves. And the valve closes when the safety
valves are powered. See sections 3.1 Item #4 for
installation instructions.
7.2.14 Motorized Safety Valve
Control packs B and E have an additional
motorized safety valve. This valve is powered open
at the same time as the safety valve. To remove the
valve actuator, shut off the 120V power and the gas
shutoff valve. Remove the right side, or front panel.
Disconnect the 120V wires from the actuator. Remove
the valve actuator by taking out the four screws, and
pulling the actuator out. Re-install in reverse order.
Turn on gas shutoff valve and 120V power and
check appliance operation and tightness of gas valve
connections.
The gas valve body will rarely have to be
removed. If there is a valve problem, and it has been