Specification Sheet

combination diaphragm valve/regulator with low-high-low operation.
Option (f)
a manual shut-off valve, pilot gas filter, pilot shut-off cock, gas pressure regulator, solenoid gas valve,
and motorized gas valve with full modulation operation.
Option (g)
a manual shut-off valve, pilot gas filter, pilot shut-off cock, gas pressure regulator, low and high gas
pressure switches, two motorized gas valves with on-off operation, normally open vent valve and
second manual shut-off valve.
* 4.2 (Low-High-Low firing rate controller to be used with Option (d) and (e)). A hi-lo firing rate controller
shall be furnished. The controller shall be of the SPST type switch with a range of 130 to 240°F to
open on temperature rise (water boiler); 2 psi to 14 psi to open on pressure rise (steam boiler).
* 4.2 (insert for 6 thru 14 section boilers - Modulating firing rate controller to be used with Option (f).
A modulating firing rate controller shall be furnished. The controller shall be 3 wire - 24 volt type with
a potentiometer resistance of 135 ohms.
* 4.2 (insert for 15 thru 26 section boilers - Modulating firing rate controller to be used with Option (f).
A dual modulating firing rate controller shall be furnished. The controller shall contain two 135 ohm
potentiometers, 24 volt type each capable of controlling a motorized modulating gas valve. Both
potentiometers to work in unison.
4.3 Boiler ignition system shall be (select option a, b, c, d, e, f, or g).
Option (a)
(Note: This ignition system must be used only with gas control train option (a or b)
of the EI type system which shall provide:
(insert for 6 thru 14 section boilers) (1) electrically ignited intermittent gas pilot
(insert for 15 thru 26 section boilers) (2) electrically ignited intermittent gas pilots
and permits the main gas valves to open only when the pilot burner is proven to be lit. Should a loss of
pilot flame occur, the main gas valve will close and the spark will recur within 0.8 seconds. If pilot fails
to ignite within 90 seconds, control will attempt to relight after 5 minutes. System shall include:
(insert for 6 thru 14 section boilers): (1) electronic ignition module, (1) electronic pilot assembly
and (1) pilot gas valve.
(insert for 15 thru 26 section boilers): (2) electronic ignition modules, (2) electronic pilot
assemblies and (2) pilot gas valves.
Option (b)
of the EO type electronic control system which provides manual ignition, 100% shut-off, continuous
pilot flame operation, electronic supervision of pilot, 0.8 second flame response time, 15 second safety
switch timing and shall include:
(insert for 6 thru 14 section boilers): (1) Honeywell RA890-F protectorelay, (1) pilot assembly,
(1) pilot safety switch.
(insert for 15 thru 26 section boilers): (2) Honeywell RA890-F protectorelay, (2) pilot assemblies,
(2) pilot safety switches.
Option (c)
of the OP type electronic control system which provides manual ignition of electronic pilot assembly,
100% shut-off, continuous pilot flame operation, electronic supervision of pilot, 0.8 second flame
response time, 15 second safety switch timing and shall include:
(insert for 6 thru 14 section boilers): (1) factory prewired electronic control panel including:
Honeywell RA890-F protectorelay, main power on switch and light, gas valve on switch and light,
flame failure light and terminal strip, (1) pilot assembly, (1) pilot safety switch.
(insert for 15 thru 26 section boilers): (2) factory prewired electronic control panels each
including: Honeywell RA890-F protectorelay, main power on switch and light, gas valve on
switch and light, flame failure light and terminal strip, (2) pilot assemblies, (2) pilot safety switches.