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Option: Lonworks interface system

Units shall have all the features listed above (either CXM or DXM) and the control board will be supplied with a LONWORKS interface board, which is LONMark certified. This will permit all units to be daisy chained via a 2-wire twisted pair shielded cable. The following points must be available at a central or remote computer location:

a.Space temperature

b.Leaving water temperature

c.Discharge air temperature

d.Command of space temperature setpoint

e.Cooling status

f.Heating status

g.Low temperature sensor alarm

h.Low pressure sensor alarm

i.High pressure switch alarm

j.Condensate sensor alarm

k.Hi/low voltage alarm

l.Fan “ON/AUTO” position of space thermostat as specified above

m.Unoccupied/occupied command

n.Cooling command

o.Heating command

p.Fan “ON/AUTO” command

q.Fault reset command

r.Itemized fault code revealing reason for specific shutdown fault (any one of 7)

This option also provides the upgraded 75VA control transformer with load side short circuit and overload protection via a built in circuit breaker.

Option: MPC (Multiple Protocol Control) interface system

Units shall have all the features listed above (either CXM or DXM) and the control board will be supplied with a Multiple Protocol interface board. Available protocols are BACnet MS/TP, Modbus, or Johnson Controls N2. The choice of protocol shall be field selectable/changeable via the use of a simple selector switch. Protocol selection shall not require any additional programming or special external hardware or software tools. This will permit all units to be daisy chain connected by a 2-wire twisted pair shielded cable. The following points must be available at a central or remote computer location:

a.Space temperature

b.Leaving water temperature

c.Discharge air temperature

d.Command of space temperature setpoint

e.Cooling status

f.Heating status

g.Low temperature sensor alarm

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