Honeywell SV2 Series User Manual page 40

SV2 Series Safety Shut-off Valves
Description
FIRE RATE
2
O2 SENSOR
2
1. Run line voltage wires in separate conduit.
2. Run low voltage wires in separate conduit. For the best Modbus communication performance, use shielded wire with two twisted pairs (Belden 9842 or
equivalent). Connect + and – to one twisted pair, and C to both wires of the other twisted pair. Connect the shield to Earth Ground at the end of the connected
external device (i.e. HMI or building automation system). Do not connect C to the shield. Route any noise producing wires in conduit separate from the HMI and
as far away from the HMI as possible. For further Modbus wiring information, refer to HMI installation instructions, document 32-00030.
3. MV2 and MV1 may be jumpered if there is no need to individually power them. MV2 and MV1 should NOT be jumpered if an external VPS control is used, which
requires MV2 and MV1 to be powered individually. On valve models with internal VPS functionality, MV2 and MV1 may be jumpered as the VPS sequence is
directed by the valve itself, rather than an external control.
4. Installation, operation and maintenance shall conform with National Fire Protection Association standards, national and local codes and authorities having
jurisdiction.
5. Use of the Pressure Module is only applicable to valve versions with embedded intelligence;
6. Rating may be valve supply voltage dependent.
– 5 = BASIC. No Modbus or Pressure Module capability.
– 6 = STANDARD. Includes Modbus, Pressure Module, external VPS using Pressure Module.
D. Stringing Wires
If purchased with the valve, the electrical connectors will be included in the valve accessory box. NEMA 4/IP66 valve models will
also have line voltage and low voltage nuts, plugs and cord grips in the accessory box.
Depending on the NEMA / IP rating of the valve, there are different steps for stringing and connecting the wires to the proper
terminals. The wires should always be strung through the proper openings and fitting before wiring to the connectors. Refer to
the SV2 Series Installation Instructions for detailed instructions.
NEMA 4/IP66 Enclosures:
NOTES:
• Use only flexible conduit with the SV2 Series valve NEMA 4/IP66 enclosures.
• There are 6 low voltage entry points using M16 x 1.5 cord grips and retaining nuts.
• There are 6 entry points with 0.875 in (2.223 cm) holes for use with:
– ½ in (1.27 cm) conduit
– The provided ½ in NPT cord grip (for the RS-485 Modbus cable due to the recommended cable size).
• To maintain the NEMA 4/IP66 enclosure rating when using the cord grips, the recommended wire ODs are as follows:
– M16 x 1.5 cord grip: Cable OD 1.7-5.8 mm (0.07-0.23 in)
– ½ in NPT cord grip: Cable OD 4.3-11.4 mm (0.17-0.45 in)
• Cord grips may be used for low voltage wiring with the included retaining nuts. Before wiring to the connectors, string the
wires through the cord grips, low voltage entry points and retaining nuts.
• Flexible conduit may be used for low and line voltage wiring. Before wiring to the electrical connectors, string the wires
through the external conduit, the valve electrical enclosure entry points and conduit retaining fittings.
• For the Pressure Module, use the cable entry point just above its mounting location or in the center of the electrical enclosure.
Be sure to place a retaining nut in the selected electrical enclosure entry location before threading the connector end through
the hole and nut.
NOTE: A NEMA 4/IP66 Pressure Module (PRESSMOD4x-000) must be used with the NEMA 4/IP66 valve electrical
enclosure to retain the enclosure rating.
Terminal Purpose
GND Ground connection for firing rate analog input
IN1 Firing rate 4-20mA / 2-10VDC analog input for metering function
GND Ground connection for oxygen sensor analog input
IN2 O2 sensor 4-20mA / 2-10VDC analog input for fuel/air adaptive
Rating
40
6 Applicable
Model(s)
-
For future enhancements
-
32-00029—02
5