Raypak LONMARK Y-200 User Manual download pdf (Page 9)

Communication (RS485) Wiring

Required for Optional Slave

Unit(s)

Y-304 Slave Cable Installation from

System Control Module

• Y-304 slave cable or equivalent shielded commu-

nications cable (Belden #9842, Belden #8132 or

Alpha 3492C) must be used. Maximum cable

length 100 ft. Correct polarity must be observed.

Make use of wire color coding to ensure polarity.

• The shielding [foil wrapper-bare wire (drain)]

MUST be grounded. Grounding is done at the

Master Y-200 Control only. DO NOT ground the

shield at the slave unit end of the cable.

• Note: Equivalent shielded cable must be suitable

for RS485 communication applications; must have

100-140 ohm impedance and less than 30 pico-

farad per foot capacitance.

• Must be installed in conduit that does not contain

any other wiring.

• Port J18 (see Fig. 4) is used for the interconnec-

tion between the master controller and slave units.

• Master/Slave interconnection should be wired

from Master to Slave #1, Slave #1 to Slave #2,

Slave #2 to Slave #3, and Slave #3 to Slave #4.

Air Temperature Sensor

Installation

• Locate the sensor on the coldest side of building,

usually the north side.

• Install the sensor in a shaded area, out of direct

sunlight.

• Locate no higher than 2/3 way up the side of the

building, or between the 2nd and 3rd floor if the

building is more than 3 stories tall.

• Do not locate under an overhang, near wall cor-

ners, near drafts from stacks, air moving devices,

windows, doors, or balconies.

• Shielded twisted pair (18 AWG) must be used for

sensor connections. Polarity must be observed.

Cable length shall not exceed 300 feet, and the

shielding must be grounded.

• Grounding is done at the Master Y-200 control

ONLY. Do Not ground the Slave units or

Temperature Sensor enclosure.

• Must be installed with properly-sized conduit that

contains no other wiring.

• The outdoor air temperature and water tempera-

ture sensor are identical and interchangeable.

Fig. 4: Master RS485 Communications Cable

Schematic

Fig. 5: Typical Outdoor Air Temperature Sensor

1 2 3 4 5 6 7 8 9 10 11 12 13 14 ... 39 40

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Raypak LONMARK Y-200 User Manual Page 9

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