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95-7769—01 64
LON Bus
The terminals in Table 40 are used to connect the LON Bus
FTT-10A. The LON terminals are insensitive to polarity,
eliminating wiring errors during installation. Recommended
wire size is level IV 22 AWG nonshielded, twisted pair, solid
conductor wired.
Output Characteristics: 24 Vac, 250 mA max continuous, 650
mA max surge.
Fan Relays
These terminals are used to connect a Fan.
Characteristics: 20 to 253 Vac, 3 A max.
Power Mains In
POWER SUPPLY
W7752D and W7752E: 230 Vac + 10%, -15%; 50/60Hz
W7752F and W7752G: 115 Vac + 10%, -15%; 50/60 Hz
POWER CONSUMPTION
W7752D and W7752E: 30 VA max
W7752F and W7752G: 30 VA max
Operational temperature
32 to 122 °F (0 to 50 °C)
Reheat Relay
These terminals connect an Electric Reheat.
Characteristics: 20 to 200 Vac, 10 A max.
Configuring Hydronic Controllers
(HYD)
Description
The W7762A and B Controllers are Hydronic Controllers in
the Excel 10 product line. They cover a wide range of control
applications including radiators, induction units, and fan coil
units with manual fan switching, and are suitable for either
wall mounting or unit mounting. The controllers can operate
as stand-alone units or networked using the standard Echelon
LONWORKS bus. Interfaces are provided for a wide range of
actuator types. Heating systems can be water or electric and
cooling systems can be chilled water supply or compressors.
Extensive timing and interlock features make the W7762
especially suitable for systems using electric heat and
compressors.
Features
• LonMark HVAC profile 8020
• Stand-alone operation or on high speed 78 kilobit LON
network.
• Uses Echelon LonTalk protocol.
• Direct connection of thermal actuators.
• Direct connection to fan switch.
• Direct connection to electric heat.
• Factory-configured default parameters.
• Wide range of supported valves and actuators.
• Interlocks and time delays to protect equipment.
• Slim design fits into narrow fan coil units.
• Terminations all on one side allow controller to be
positioned at back of fan coil unit.
• Power supplied by power mains.
Description
The W7762A and B are LonMark compliant Hydronic
Controllers in the Excel 10 family product line. These
controllers provide room temperature control using different
heating and cooling sequences. The controller is provided
with default configuration settings from the factory and is fully
operable on installation. Using standard Echelon configuration
tools, the controller can be configured with job specific
settings. TR21 and TR23 wall modules interface with the
Hydronic Controllers and provide the following options:
setpoint adjustment, an occupancy bypass button and LED,
and a LON network access jack. All wall include a space
temperature sensor, however a remote C7068A return air
sensor can also be used.
Table 40. LON Bus Terminal Connections.
Output 1 /
Output 2 Terminal 14/15 Terminal 17/18
Floating 14 on = open valve 17 on = open valve
15 on = close valve 18 on = close valve
1-stage 14 = on/off 17 = on/off
15 = not used 18 = not used
2-stage 14 on = stage 1 17 on = stage 1
14 on + 15 on =
stage 2
17 on + 18 on =
stage 2
3-stage 14 on = stage 1 17 on = stage 1
15 on = stage 2 18 on = stage 2
14 on + 15 on =
stage 3
17 on + 18 on =
stage 3
PWM 14 = PWM 17 = PWM
15 = not used 18 = not used
Thermal 14 = Pulse modulated 17 = Pulse modulated
15 = not used 18 = not used
Table 41. Hydronic Heating and Cooling Options.
Output Options
Heating Floating, thermal, PWM, on/off, multi-stage electric
Cooling Floating, thermal, PWM, on/off, multi-stage
compressor