Carrier WeatherMaster 50HC14 Installation Instructions Manual page 25

Single package rooftop cooling only unit with puron (r-410a) refrigerant
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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
IMPORTANT: All inputs and outputs must be Class 2
wiring.
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 dif-
ferential 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 to 150 F (-40 to 65 C)
Temperature accuracy -0 F/+2 F
Temperature and Humidity, C7400S1000 (optional)
S-Bus; 2-wire (18 to 22 AWG)
Temperature: range -40 to 150 F (-40 to 65 C)
Temperature accuracy -0 F/+2 F
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
27 for wiring details).
24 Vac power supply — 20 to 30 Vac 50/60Hz; 100 VA Class
2 transformer.
OUTPUTS
Actuator Signal: 2-10 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 to 150 F (-40 to 65 C).
Exception of display operation down to -4 F with full
recovery at -4 F from exposure to -40 F
Storage Temperature:
-40 to 150 F (-40 to 65 C)
Shipping Temperature:
-40 to 150 F (- 40 to 65 C)
Relative Humidity:
5% to 95% RH non-condensing
ECONOMIZER MODULE WIRING DETAILS — Use
Fig. 47 and Tables 3 and 4 to locate the wiring terminals for the
Economizer module.
NOTE: The four terminal blocks are removable. You can slide
out each terminal block, wire it, and then slide it back into
place.
MAT
MAT
OAT
OAT
S-BUS
S-BUS
IAQ 2-10
IAQ COM
IAQ 24V
ACT 2-10
ACT COM
ACT 24V
50040839-001
Rev. G
Fig. 47 — W7220 Wiring Terminals
Table 3 — Economizer Module - Left Hand
Terminal Blocks
LABEL
TYPE
Top Left Terminal Block
MAT
20k NTC
MAT
and COM
OAT
20k NTC
OAT
and COM
S-BUS
S-BUS
S-BUS
(Sylk Bus)
Bottom Left Terminal Block
IAQ 2-10
2-10 vdc
IAQ COM
COM
IAQ 24V
24 vac
ACT 2-10
2-10 vdc
ACT COM
COM
ACT 24v
24 vac
25
MA
NA
MA
A2
OA
OC C
OA
EX
SB
SB
A1
SB
SB
Cert
Product
California Title 24, Part 6
HJW10
SB
SB
www.energy.ca.gov
V
Y2I
C
R
Y2O
Y1I
V
Y1O
C
R
C
NA
R
50048848-002
DESCRIPTION
Mixed Air Temperature Sensor (Polarity
Insensitive Connection)
Outdoor Air Temperature Sensor
(Polarity Insensitive Connection)
Enthalpy Control Sensor
(Polarity Insensitive Connection)
Air Quality Sensor Input (e.g. CO
sensor)
Air Quality Sensor Common
Air Quality Sensor 24 vac Source
Damper Actuator Output (2-10 vdc)
Damper Actuator Output Common
Damper Actuator 24 vac Source
NA
AUX2-
OCC
E-GND
EXH1
AUX1-O
Y2-
Y2-O
Y1-
Y1-O
C
R
Rev. A
2

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