HeatRite VM-115, Инструкция по установке, эксплуатации и обслуживанию, Страница: 55 / 80

SECTION 10: W
IRING
49 of 71
For 4-20mA control of the heater(s) firin g rate, the
followin g control conditions apply:
ON/OFF relay at the external controller or BMS m u st
be w ired to R and W terminals on the heater control
board to t u rn the heater ON and OFF.
(Open Circ u it = OFF, Closed Circ u it = ON).
Minim u m rated inp u t at 1% of signal (0-4 mA).
F u ll rated inp u t at 90% of signal (18 mA).
Inp u t v aries linearly bet w een 4 mA and 18 mA.
BMS controllers often offer PID loop control that can
optimize o
u tp u t signal and rate of change of the
o u tp u t signal. Common analog application is defined
as follo w s:
1. BMS sensors that monitor zone air
temperat u res are located in the heating space.
2. Based on sensed temperat u res, the BMS w ill
o u tp u t an analog signal for the desired heater(s)
firing rate.
3. As heater(s) recei v e the analog signal from the
BMS, the heater(s) mod u late to the correspond-
ing firing rate.
4. As sensed air temperat u re rises closer to the
desired temperat u re setpoint, the BMS w ill
red u ce the o u tp u t signal, in t u rn red u cing heater
firing rate.
5. Upon satisfying temperat u re setpoint, the BMS
w ill either:
a. T u rn off the heater.
b. Red u ce the signal so that the minim u m
heater firing rate is maintained u ntil the
sensed temperat u re rises abo v e the
setpoint to a c u t-off limit temperat u re w hen
the BMS t u rns off the heater.
FIGURE 26: Analo g Control Si g nal Wirin g Dia g ram
*OPTIO N AL
S W ITCH
SATELLITE HEATER CONTROL
FOR SATELITTE
CO
N TROLLERS, J9 JUMPER CA N BE
LEFT I N ORIGI N AL POSITIO N
REGARDLESS OF CO N TROL METHOD.
J10 JUMPER POSITIO N
SHO W S "SATELLITE" DESIG N ATIO N .
MODULATIO N CO N TROL W IRI N G
TO ADDITIO N AL SATELLITE
HEATER CO N TROL TERMI N ALS
T2 8 and T29.
O N /OFF S W ITCH
REQUIRED
MODULATIO N CO N TROL W IRI N G
TO SATELLITE HEATERS
CENTRAL HEATER CONTROL
REMOTE A N ALOG
CO N TROL
SIG N AL FROM SEPARATE
CO N TROLLER
0-10 V dc OR 4-20mA
A N ALOG I N PUT CO N TROL IS
USED TO SELECT A N ALOG
SIG N AL TYPE 0-10 V dc OR 4-20mA
(4-20mA POSITIO N SHO WN ).
J10 JUMPER POSITIO N
SHO W S "CE N TRAL"
DESIG N ATIO N A N D
"A N ALOG" CO N TROL METHOD.
J10
J9
W
R
-
+
-
+
-
+
OUT
RA
TE
FIRI
N
G
I
N
RA
TE
FIRI
N
G
EXT
. PO
T
G
N
D
W
IPER
HIGH
G
N
D
BA
R
SLIDE
G
N
D
THERMIS
T
OR
I
N
PUT
A
N
AL
OG
THERMOSTAT
T31
T29
T19
T1 8
T16
T14
T27
T25
T30
T2 8
T17
T15
T13
T26
T24
-
+
J10
J9
W
R
-
+
-
+
-
+
OUT
RA
TE
FIRI
N
G
I
N
RA
TE
FIRI
N
G
EXT
. PO
T
G
N
D
W
IPER
HIGH
G
N
D
BA
R
SLIDE
G
N
D
THERMIS
T
O
R
I
N
PUT
A
N
AL
OG
THERMOSTAT
T31
T29
T19
T1 8
T16
T14
T27
T25
T30
T2 8
T17
T15
T13
T26
T24
A B
A B
* 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.