Raypak RAYTHERM 0133-4001 - Manual (Page 21)

OPERATING CONTROLS
Models 133-1826 with mechanical modulating
controls have one or more Robertshaw Unitrol 7000
Series hydraulic snap-on thermostatic combination
gas valves. These 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 compared to an on-off cycling
boiler. The valve has a remote capillary bulb im-
mersed in a well, at the header outlet, to maintain a
constant outlet water temperature. When multiple
valves are furnished, 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.
LOW TEMP. RANGE HIGH TEMP. RANGE
IGNITION MODULE
ELECTRONIC SAFETY
ACAD: ECONO. DWG.
Fig. #8645.1
Fig. #8645 Fig. # 8929.1
21
3/4
ELECTRONIC IGNITION
The intermittent ignition device conserves energy
by automatically extinguishing the pilot when desired
temperature is reached. When additional heat is
needed, 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.
CONTROLS
ECONOMASTER CONTROLS
The Raytemp Economaster II is an electronic de-
vice 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
satisfied, the main gas valve closes, but the pump
continues operating. With the new energy-conserving
Economaster II the boiler pump is programmed to
continue running for an optimum period of time in order
to absorb the residual heat from the combustion cham-
ber 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.