Roberts Gorden Energytube EM-115, Nstallation, Operation And Service Manual

Page: 56 / 82

EM-S
ERIES
I
NSTALLATION
, O
PERATION AND
S
ERVICE
M
ANUAL
50 of 71
10.5.9 Potentiometer Control Device
Potentiometer (10K Ohm"Linear Taper") de v ice offers
man u al control o v er heater(s) firing rate. This type of
potentiometer can be fo u nd at Radio Shack ® .
Potentiometer dial position directly dictates heater(s)
firing rate. Dial positions range bet
w een "Min" and
"Max". Minim u m and maxim u m heater firing rates
(inp u ts) are marked on the heater's rating plate. ON/
OFF s w itch or thermostat is u sed to disable heater
operation or reset heater from locko u t.
FIGURE 27: Potentiometer Control Wirin g Dia g ram
*O PT ION A L
SWI TC H
SATELLITE HEATER CONTROL
J10 JUM PER P OSI T ION
SHOWS "S ATE LLI TE " DE SI G N AT ION.
MO D UL AT ION C ON TR OL WI R IN G
T O ADD I T ION A L S ATE LLI TE
H EATER C ON TR OL TER MIN A LS
T 28 A N D T 29.
MO D UL AT ION C ON TR OL WI R IN G
T O S ATE LLI TE H EATER S
CENTRAL HEATER CONTROL
J10
W
R
-
+
-
+
-
+
OU
T
RA
TE
F
I
R
IN
G
IN
RA
TE
F
I
R
IN
G
E
X
T
.
P
O
T
G
N
D
WI
PER
HI
G
H
G
N
D
BAR
SLI
DE
G
N
D
T
H
ER
MIS
T
O
R
IN
P
U
T
A
N
A
LO
G
T H ER MOS TAT
T 31
T 29
T 19
T 18
T 16
T 14
T 27
T 25
T 30
T 28
T 17
T 15
T 13
T 26
T 24
J10
W
R
-
+
-
+
-
+
OU
T
RA
TE
F
I
R
IN
G
IN
RA
TE
F
I
R
IN
G
E
X
T
.
P
O
T
G
N
D
WI
PER
HI
G
H
G
N
D
BAR
SLI
DE
G
N
D
T
H
ER
MIS
T
O
R
IN
P
U
T
A
N
A
LO
G
T H ER MOS TAT
T 31
T 29
T 19
T 18
T 16
T 14
T 27
T 25
T 30
T 28
T 17
T 15
T 13
T 26
T 24
ON/O FF SWI TC H
or T H ER MOS TAT
A B
A B
J10 JUM PER P OSI T ION
SHOWS " CE N TRA L"
DE SI G N AT ION A N D
" P O TE N T IOM ETER "
C ON TR OL M ET HO D .
POTENTIOMETER
(10K Ohm)
* Separate on/off s w itch is optional for "satellite" heaters (install at u ser le v el).
On/Off s w itch is u sed to disable heater operation or reset a heater that is in "locko u t" mode.
If on/off s w itch is not desired, lea v e j u mper w ire bet w een R and W terminals in place.