75
HELIX™ Manual
(P/N 26291)
Chapter 4: System Installation
Rev A (February 2018)
HELIX™ PCU
Fire Suppression System
TERMINAL BOARD #1 (TB1) CABLE CONNECTIONS
SCREW
TERMINAL
#
COLOR
CODE
AMEREX SUPPLIED CABLE
(Only Actuation Cables are
polarity sensitive)
1*
(
-
)
PRESSURE SWITCH
LEAD (24414
-
XX)*
2*
(+)
3**
(
-
)
DETECTION LEAD #2
(24409
-
XX)
4**
(+)
5
(
-
)
DETECTION LEAD #1
(24409
-
XX)
6
(+)
7
(
-
)
MANUAL PULL LEAD
(24412
-
XX)
8
(+)
9
(
-
) BLACK
ACTUATION LEAD #2
(24411
-
XX)
10
(+) WHITE
11
(
-
) BLACK
ACTUATION LEAD #1
(24411
-
XX)
12
(+) WHITE
Table 4.9a
1 2 3 4 5 6 7 8 9 10 11 12
TERMINAL BOARD #1 (TB1)
Figure 4.9b
TERMINATE ALL AMEREX CABLES WHERE SHOWN IN
TABLE 4.9a. ONLY ACTUATION CABLES ARE
POLARITY SENSITIVE.
LEAVE SCREW TERMINALS
EMPTY
FOR ANY UNUSED CIRCUITS
SCREWS
IF ORIGINAL COLOR
CODED P/N LABEL IS
REMOVED WHEN
TRIMMING CABLE,
AN EXTRA LABEL IS
PROVIDED WITH
EACH CABLE AND
CAN BE APPLIED TO
CABLE END TO
MAINTAIN COLOR
CODE REFERENCE
INSERT INDIVIDUAL
STRIPPED WIRE END
INTO TERMINAL AND
TIGHTEN SCREW TO 3
-
4
IN
-
LBS TO SECURE
*The Pressure Switch terminals are supplied with a jumper
wire installed. If a Pressure Switch is used, remove this
jumper wire and install Pressure Switch Lead Cable where
shown. If a Pressure Switch is NOT used, leave this jumper
wire installed.
**The Communication Cable (P/N 25264
-
XX) may be used
on an available Detection Zone to receive an alarm signal
from an additional STRIKE Unit, external FACP or alarm
initiating snap action switch. See Figures 3.6.1c/d/e.
T
E
R
M
IN
A
L
BO
A
R
D
#
2 (
T
B
2)
TERMINATE ALL
INSTALLER
SUPPLIED WIRING
WHERE SHOWN IN
TABLE 4.9b.
LEAVE
SCREW TERMINALS
EMPTY FOR
ANY
UNUSED CIRCUITS
SCREWS
Figure 4.9c
INSERT INDIVIDUAL STRIPPED WIRE
END INTO TERMINAL AND TIGHTEN
SCREW TO 3
-
4 IN
-
LBS TO SECURE
1
2
3
4
5
6
7
8
9
1
0
1
1
1
2
13
14
COM TERMINALS
FOR ALL RELAYS
USED (1, 2 OR 3)
MUST BE
CONNECTED USING
JUMPER WIRES
(FOR 24695 ONLY)
FIRE ALARM
EOL RESISTOR
TROUBLE (FAULT)
EOL RESISTOR IN
SERIES
TERMINAL BOARD #2 (TB2) CABLE CONNECTIONS
SCREW
TERMINAL
#
INSTALLER SUPPLIED WIRING
CONNECTIONS
14
COM FIRE ALARM
AUXILIARY FACP
16
-
2
4 A
W
G
W
IR
E
13
N/O FIRE ALARM
12
COM FIRE ALARM
EOL RESISTOR
11
10
COM TROUBLE WITH
EOL RESISTOR IN
SERIES
9
N/C TROUBLE
8
COM
RELAY #1
(GAS VALVE)
14
-
2
6 A
W
G
W
IR
E
7
N/C
6***
COM
RELAY #2***
(FOR USE WITH
RELAY MODULE
24695 )
5
N/C
4***
N/O
3***
COM
RELAY #3***
(FOR USE WITH
RELAY MODULE
24695 ONLY)
2
N/C
1***
N/O
Table 4.9b
*** Normally Open (N/O) & COM contacts may be used
for Communication Cable (P/N 25264–XX) connection
for alarm indication to an additional STRIKE Unit or
external FACP. See Figures 3.6.1c/d.