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Variable-Frequency Drives —
The input signal for
the inverter must be 4 to 20 mA. Use a 2-conductor
20 AWG (American Wire Gage) cable (single twisted pair,
unshielded) to connect the input of the inverter to the output
of the PIC control terminals. See Fig. 8.
Wire the inverter so that if it is placed in the manual or
bypass mode the low temperature thermostat and the high-
pressure switch (if supplied) are still in the motor control
circuit to protect the unit.
Adjust the minimum inverter speed to provide at least 10%
airflow when inlet guide vanes are at 0% (4 mA) and maxi-
mum design airflow when inlet guide vanes are at 100%
(20 mA). Use the local interface device to verify that the
supply fan status (
) shows the fan is ON and that the
supply fan is operating at the lowest airflow adjustment. In-
crease inverter minimum speed as required. For additional
information, see the Quick Test section on page 103.
Water Valve Assemblies —
Water valve assemblies
(Fig. 13) are shipped inside the fan section for field instal-
lation. All valve assemblies have electrically powered ac-
tuators. Each actuator has an external junction box for field
wiring. The junction box contains 24 vac power wires (WHITE/
BLUE, BLACK) and 4 to 20 mA signal wires (
1
RED,
−GREEN). The actuators operate the valve through a linear
stroke; if power is lost, a return spring reverses the stroke
and returns the valve stem to the normal position.
To prevent electric shock and equipment damage, dis-
connect the power to the control box before installing
valve assemblies. Turn power switch located on control
box door to OFF.
On installations where valve mounting space is limited,
use unions to couple valve assemblies to water lines. If unions
do not provide sufficient clearance, refer to the Valve
Troubleshooting section, page 109.
On chilled water applications or hot water applications with
1
1
⁄
2
to 3-in. valves, the valve actuators can be mounted in
any position above the centerline of the valve body. For steam
applications or hot water applications with
1
⁄
2
to 1
1
⁄
4
-in. valves
that have actuators and high-temperature linkage exten-
sions, mount the actuator above the centerline of the valve
body and 45 degrees from vertical. This position helps to
prevent actuator exposure to direct heat convection.
DO NOT install valve assembly where excessive mois-
ture, corrosive fumes, and/or vibration are present.
INSTALL all 2-way valve assemblies so that they close
against system flow. An arrow on the valve body indi-
cates the proper flow direction.
ALWAYS install 3-way mixing valve with 2 inlet flows
and one outlet. Normal flow will be from port B to port
AB with stem up. See Fig. 14.
ACTUATOR LINKAGE
VALVE BODY
VALVE ACTUATOR
Fig. 13 — Valve Assembly (Typical)
Fig. 14 — Three-Way Mixing Valve — Normal Flow,
Typical Piping
38
Summary of Contents for 39L Series
Page 9: ...Fig 6 PIC Section Control Box Component Arrangement 39NX Sizes 07 21 9...
Page 10: ...Fig 7 PIC Section Control Box Component Arrangement 39NX Sizes 26 92 10...
Page 13: ...Fig 9 Unit Wiring Schematic 39L Sizes 03 35 115 v Typical 13...
Page 14: ...Fig 9 Unit Wiring Schematic 39L Sizes 03 35 115 v Typical cont 14...
Page 15: ...Fig 9 Unit Wiring Schematic 39L Sizes 03 35 115 v Typical cont 15...
Page 16: ...Fig 9 Unit Wiring Schematic 39L Sizes 03 35 115 v Typical cont 16...
Page 17: ...Fig 9 Unit Wiring Schematic 39L Sizes 03 35 115 v Typical cont 17...
Page 18: ...Fig 9 Unit Wiring Schematic 39L Sizes 03 35 115 v Typical cont 18...
Page 19: ...Fig 10 Unit Wiring Schematic 39NX Sizes 07 21 115 v Typical 19...
Page 20: ...Fig 10 Unit Wiring Schematic 39NX Sizes 07 21 115 v Typical cont 20...
Page 21: ...Fig 10 Unit Wiring Schematic 39NX Sizes 07 21 115 v Typical cont 21...
Page 22: ...Fig 10 Unit Wiring Schematic 39NX Sizes 07 21 115 v Typical cont 22...
Page 23: ...Fig 10 Unit Wiring Schematic 39NX Sizes 07 21 115 v Typical cont 23...
Page 24: ...Fig 10 Unit Wiring Schematic 39NX Sizes 07 21 115 v Typical cont 24...
Page 25: ...Fig 11 Unit Wiring Schematic 39NX Sizes 26 92 115 v Typical 25...
Page 26: ...Fig 11 Unit Wiring Schematic 39NX Sizes 26 92 115 v Typical cont 26...
Page 27: ...Fig 11 Unit Wiring Schematic 39NX Sizes 26 92 115 v Typical cont 27...
Page 28: ...Fig 11 Unit Wiring Schematic 39NX Sizes 26 92 115 v Typical cont 28...
Page 29: ...Fig 11 Unit Wiring Schematic 39NX Sizes 26 92 115 v Typical cont 29...
Page 30: ...Fig 11 Unit Wiring Schematic 39NX Sizes 26 92 115 v Typical cont 30...
Page 31: ...Fig 12 Unit Wiring Schematic 39L and 39NX PIC with Remote Control Box 31...
Page 32: ...Fig 12 Unit Wiring Schematic 39L and 39NX PIC with Remote Control Box cont 32...
Page 33: ...Fig 12 Unit Wiring Schematic 39L and 39NX PIC with Remote Control Box cont 33...
Page 34: ...Fig 12 Unit Wiring Schematic 39L and 39NX PIC with Remote Control Box cont 34...
Page 35: ...Fig 12 Unit Wiring Schematic 39L and 39NX PIC with Remote Control Box cont 35...
Page 36: ...Fig 12 Unit Wiring Schematic 39L and 39NX PIC with Remote Control Box cont 36...