ONICON System-10 BTU - Manual (Page 23)

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System-10 BTU Meter Manual 03/15 - 0651-16 / 18323 Page 23
3.3.3 Contact Closure Input For Flow Direction
The System-10 is provided with a separate input for determining flow direction.
Connections for this input are made at T4 terminals 8 (+) and 9 (-). This input can be
connected to a non-polarized contact closure relay or an open connector output. Note that
the input is polarized for sinking (NPN) open collector outputs. Totals will accumulate in
the mode 1 registers whenever the contacts are closed.
3.3.4 Contact Closure Output For Energy Total(s) And Mode Status
For single mode applications (heating or cooling), the output relay for energy total is
located on the mother board at T1, pins 1 and 2. The value of each “closure” is listed on
the certificate of calibration and is the same as the energy total multiplier displayed on the
LCD (example: each closure = 10,000 Btu’s).
For dual mode applications (two-pipe heat/cool), the energy total for the heating mode
(where supply temp is greater than return temp) is provided at T1, pins 1 and 2. The
energy total in the cooling mode is provided at T1, pins 3 and 4. Mode status is at T1, pins
5 and 6 (open contact = mode 1 operation).
For bi-directional applications, the table below describes the relationship between mode 1
and mode 2 totals and forward and reverse flow for ONICON insertion turbine and inline
electromagnetic flow meters.
Do not exceed 4.5 in-lb (0.5 Nm) of torque when tightening the terminals.
FLOW
METER
MODEL
FLOW DIRECTION
RELATIVE TO
DIRECTION ARROW ON METER
FLOW METER
OUTPUT
CONDITION
SYSTEM-10 MODE
STATUS INDICATOR
(T1 - PINS 5 & 6)
SYSTEM-10 REGISTER
ACCUMULATING
TOTALS
FB-1200 or
FB-3500
Series
Flow in the direction of arrow Closed contact Open contact Mode 1
Flow reverse from direction arrow Open contact Closed contact Mode 2
F-3000 Series
Inline
Flow Meter
Flow toward (+) sign
Not energized
(open)
Closed contact Mode 2
Flow toward (-) sign
Energized
(closed)
Open contact Mode 1
J1
5
G 60HZ
1
J2-1
+15 +24
J2-12
G G
10
R7
H3
R1
20075-50 REV. A
LED1
T1
D1
D2
VAR1
F1 1/4 AMP
TB1
D4
D3
H1
1
BTU METER OUTPUTS
BTU CONTACT OUTPUT
MODE 1
BTU CONTACT OUTPUT
MODE 2
MODE STATUS
T1
1
2
3
4
5
6
L1 N Not Used