Remington HH-70T-KFA Service Manual Page 127

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Various Ignition Control Boards (D.S.I.s)
The 7801NR was the Scheu replacement
for the 7499NR Ram. This ignition
control was the first control to eliminate
the second common wire. In other
words, instead of having a 120 volt return
and a valve return, you just have the one
common (white) return. This board
requires a wiring harness for operation.
This ignition control does flame sensing
thru the top of the board via the electrode
(or spark plug) and ignition lead. The
7808NR listed to the right is the direct
replacement for this control unit.
The Fenwal 7808NR is the same as the
Gasliter 7808NR to the left except that at
the time of printing, Scheu is the only
company using it.
The 7499NR
(Ram1M5-
01) was used
by Scheu
exclusively.
This ignition
control does flame sensing thru the
1/4" male spade connection located
on top of the board via the electrode
(or spark plug) and ignition lead. It
has individual wires running to 1/4"
male spade connections on the side
of the unit.
Desa, Scheu,
L.B. White, and
even Toro used the Ram-1 control
extensively in heaters. This control unit
required a wiring harness that attached to
the side of the unit. This ignition control
does flame sensing thru the top (base
stud) of the board via the electrode (or
spark plug) and ignition lead.
The 08810 is a
control board that
is used by L.B.
White exclusively.
This board is a
diagnostic board.
That means that
the board is
capable of
sending an electrical pulse signal to a small
light (L.E.D.) that will flash for a certain
amount of times, depending on what is
wrong with the heater. This board
monitors and delivers 24 volts to the gas
valve, 120 volts to the motor, and it
generates and delivers approximately
15,000 volts to the electrode for the
ignition sequence. This board also utilizes
a base stud located on top of the board to
attach the ignition lead.
The 7808NR (or the 110287-01), Made by
Gasliter, is the most common ignition
control unit used by both Scheu and Desa
for heater production at the time of this
printing (though they use different wiring
harnesses). This control is a "potted"
control. The term "potted" means that
the board has a jell coating to give a
degree of moisture resistance. This
control requires a wiring harness for
operation. This ignition control does
flame sensing thru the 1/4" male spade
located on top of the board, via the
electrode (or spark plug) and ignition
lead. 7808NR is the replacement for the
7801NR.
The 22301 from L B
White works the same
way as the 08810
listed on top right.
The M51605-01 control was used by Desa
only. What makes this control stand out
from the other Gasliters is that it does not
do flame monitoring thru the ignition
lead, and the ignition lead connection is
only an 1/8" male spade connection. The
flame monitoring is accomplished thru a
1/4" male spade located on the front of
the board itself (on the terminal labeled
"SENS") which will attach to the flame
sensor.
The M51605-02
(or 7219NR) was
once the most
common control
board used by
both Desa and
Scheu. This was
the first Gasliter
board that did
the flame
sensing thru the ignition post located on
the top of the board. In addition, this was
the first Gasliter to include all of the
individual control wires.
The 05549 control
was used by L B
White exclusively.
This control was
used for a few
select heater
models (some of
the 292s and
296s mainly).
This control also utilizes the base stud to
attach the ignition lead.
RAM-1M5-01
RAM-1
MARK10DN-117-3-8.5-8.5-P0062
10DN-117-3-8.5-8.5-Q011
10DN-117-3-8.5-8.5-Q012
MARK10X-117-3-7-7-Q010
24VAC 1016-400 SERIES
RAM-3MC2-01
Gas Heater Service Info.
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