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37
User Interface
Provides status for normal operation, setup parameters, check-
out tests, and alarm and error conditions with a 2-line 16 char-
acter LCD display and four button keypad.
Electrical
• Rated Voltage —
20 to 30 vac RMS, 50/60 Hz
• Transformer — 100 va maximum system input
• Nominal Power Consumption (at 24 vac, 60 Hz) —
11.5 VA without sensors or actuators
• Relay Digital Output Rating at 30 vac (maximum power
from Class 2 input only) — 1.5A run:
3.5A inrush at 0.45PF (200,000 cycles) or
7.5A inrush at 0.45PF (100,000 cycles)
• External Sensors Power Output — 21 vdc ± 5% at 48mA
INPUTS
Sensors
NOTE: A mixed air (MA) analog sensor is required on all W7220
units; either an outdoor air (OA) sensor for dry bulb change over
or an OA bus sensor for outdoor enthalpy change over is required
in addition to the MA sensor. An additional return air (RA) bus
sensor can be added to the system for differential enthalpy or dry
bulb changeover. For differential dry bulb changeover, a 20k ohm
sensor is required in the OA and a bus sensor in the RA. DIP
switch on RA bus sensor must be set in the RA position.
Dry Bulb Temperature (optional) and Mixed Air (required),
20k NTC
2-wire (18 to 22 AWG);
Temperature range: –40°F to 150°F (–40°C to 66°C)
Temperature accuracy: 0°F/+2°F
Temperature and Humidity, C7400S1000 (optional)
S-Bus; 2-wire (18 to 22 AWG)
Temperature: range: –40°F to 150°F (–40°C to 65°C)
Temperature accuracy: 0°F/+2°F (–18°C/–17°C)
Humidity: range 0 to 100% RH with 5% accuracy.
NOTE: Up to three (3) S-Bus sensors may be connected to the
W7220 economizer module for outdoor air (OA), return air (RA)
and discharge (supply) air (DA).
4 Binary Inputs
1-wire 24 vac + common GND (see page 38 for wiring details).
24 vac power supply
20 to 30 vac 50/60Hz; 100 VA Class 2 transformer.
OUTPUTS
Actuator Signal
2 to 10 vdc; minimum actuator impedance is 2k ohm; bus two-
wire output for bus communicating actuators.
Exhaust fan, Y1, Y2 and AUX1 O
All Relay Outputs (at 30 vac):
Running: 1.5A maximum
Inrush: 7.5A maximum
ENVIRONMENTAL
Operating Temperature
–40°F to 150°F (–40°C to 65°C).
Exception of display operation down to –4°F (–20°C) with full
recovery at –4°F (–20°C) from exposure to –40°F (–40°C)
Storage Temperature
–40°F to 150°F (–40°C to 65°C)
Shipping Temperature
–40°F to 150°F (–40°C to 65°C)
Relative Humidity
5% to 95% RH non-condensing
ECONOMIZER MODULE WIRING DETAILS
Use Fig. 49 and Tables 7 and 8 to locate the wiring terminals
for the Economizer module.
NOTE: The four terminal blocks are removable. Slide out each
terminal block, wire it, and then slide it back into place.
Fig. 49 — W7220 Wiring Terminals
IMPORTANT: All inputs and outputs must be Class 2 wiring.
NA
AUX2-
OCC
E-GND
EXH1
AUX1-O
Y2-
Y1-
Y2-O
Y1-O
C
R
50048848-002
Rev. A
NA
A2
OCC
EX
A1
Y2I
Y2O
Y1I
Y1O
C
R
MAT
MAT
OAT
OAT
S
-BU
S
S
-BU
S
IAQ 2-10
IAQCOM
IAQ 24V
ACT 2-10
ACT COM
ACT 24V
MA
MA
OA
OA
S
B
S
B
S
B
S
B
S
B
S
B
V
C
R
V
C
R
NA
500408
3
9-001
Rev. G
HJW10
www.energy.c
a
.gov
Certified FDD Prod
u
ct
C
a
liforni
a
Title 24, P
a
rt 6
Summary of Contents for 50LC 14
Page 26: ...26 Fig 34 50LC 14 26 Control Wiring Diagram...
Page 27: ...27 Fig 35 50LC 14 26 RTU Open Control Wiring Diagram...
Page 28: ...28 Fig 36 50LC 14 20 208 230V 3 Phase Power Wiring Diagram...
Page 29: ...29 Fig 37 50LC 24 26 208 230V 3 Phase Power Wiring Diagram...
Page 30: ...30 Fig 38 50LC 14 26 460V 575V 3 Phase Power Wiring Diagram...