Raypak 133-4001 manual Economaster Controls, Electronic Ignition, Operating Controls

CONTROLS

Economaster Controls

The Economaster II is an electronic device that allows the operator to set the desired time for the pump to run after the boiler shuts off. The time is factory-set at 7 minutes and it can be re-adjusted in the field anywhere from 3 to 10 minutes.

In a conventional system, when the aquastat is satis- fied, the main gas valve closes, but the pump continues operating. With the energy-conserving Economaster II the boiler pump is programmed to con- tinue running for an optimum period of time in order to absorb the residual heat from the combustion chamber and use it in the system. The pump then shuts off until the next call for heat is received from the aquastat.

NOTE: Pump will come on when power is first applied to boiler.

Fig. 26: Economaster PCB

Electronic Ignition

The intermittent ignition device conserves energy by automatically extinguishing the pilot when desired temperature is reached. When additional heat is need- ed, the pilot re-ignites electrically, eliminating the fuel costs of maintaining a constant pilot. To ensure safe operation, the gas valve cannot open until the pilot relights and is proven.

All units are shipped with lockout ignition module as standard.

Operating Controls

Modes H1 and H5 - Mechanical Modulation

Models 133-1826 with mechanical modulating controls have one or more Robertshaw (Invensys) Unitrol 7000 Series hydraulic snap-on thermostatic combination gas valves. These dual-seat combination valves have the pressure regulator and 24 volt operator built-in. The hydraulic actuator will throttle the boiler input to adjust the firing rate and meet the required load. This, in effect, prevents costly fuel consumption, as com- pared to an on-off cycling boiler.

The valve has a remote capillary bulb immersed in a well, at the header outlet, to maintain a constant outlet water temperature. When multiple valves are fur- nished, they can be staged to give greater flexibility of control. Standard factory setting is at position 5. Consult the dial setting tag attached to the control for your desired temperature. See sample tag drawings below.

NOTE: No external control of the valve position is possible.

INVENSYS INVENSYS

Low Temp. Range High Temp. Range

Fig. 27: Sample Tags

21