York Meridian Technical Manual page 25

036-21478-001 Rev. A (0802)
Controller Wiring
All controller wiring should be in accordance with all
local, state, and national codes. It is recommended that
all wire be a minimum of 18 AWG unless otherwise
specified in the charts below. Controller connections
and wire sizing is as follows:
Zone Manager
•
24 VAC Supply Voltage (25 VA)
(2) Conductors - Determine minimum
wire size from Figure 1-16 on page 26.
•
Communications Loop
(2) Conductors 18 gauge minimum
twisted pair with shield
(York communication wire,
Belden #82760 or equal)
•
Supply Air Temperature Sensor
(2) Conductors 24 gauge minimum
•
Return Air Temperature Sensor
(2) Conductors 24 gauge minimum
•
Outside Air Sensor
(2) Conductors 24 gauge minimum
•
Supply Static Pressure Sensor
(2) Conductors 24 gauge minimum
•
Bypass Damper
(4) Conductors 24 gauge minimum
•
HVAC Unit Control Wiring
(6) Conductors 24 gauge minimum
R (Common), G (Fan), Y1 (Cool 1),
Y2 (Cool 2), W1 (Heat 1), W2 (Heat 2)

For Meridian Plus System With
Optional Staging Expansion Board up to
an additional (8) conductors Y3 through
Y6, W3 Through W6
System Manager
•
24 VAC Supply Voltage (25 VA)
(2) Conductors - Determine minimum
wire size from Figure 1-16 on page 26.
•
Communications Loop
(2) Conductors 18 gauge minimum
twisted pair with shield
(York communication wire,
Belden #82760 or equal)
Meridian Systems

Zoning Design Guide
Zone Controller
•
24 VAC Supply Voltage (10 VA)
(2) Conductors - Determine minimum
wire size from Figure 1-16 on page 26.
•
Communications Loop
(2) Conductors 18 gauge minimum
twisted pair with shield
(York communication wire,
Belden #82760 or equal)
•
Room Sensor
(2) Conductors 24 gauge minimum
(3) Conductors if using optional slide
Sensor Wiring

Meridian temperature sensors utilize a type III ther-
mistor element that is one of the most commonly used
sensors in the building controls industry. Sensor wire
should be a minimum of 24 gauge however larger wire
such as 18 gauge is commonly used.
Conventional thermostat cable is acceptable in most
commercial and institutional installations. In some in-
stallations which have the potential for high electrical
noise, such as broadcast facilities (radio, TV, etc.), heavy
industrial (machinery, welding equipment, etc.), and
medical (x-ray, scanning, etc.), it is advisable to use
shielded cable on sensors which are located in or close
to these environments. The same cable used for the com-
munication bus can be used in these situations.
Sensor requirements are:
•
Supply Air Sensor
(2) Conductors 24 gauge minimum
•
Return Sensor
(2) Conductors 24 gauge minimum
•
Outside Air Sensor
(2) Conductors 24 gauge minimum
•
Room Sensor
(2) Conductors 24 gauge minimum
(3) Conductors if using optional slide
adjust
25