OM 780-2 Page 25
3. Before the 5-minute timer expires, go to the remote I/O module and press the clear service pin button on the lower left-
hand side of the module (directly below the L
ONMARK logo). The amber LED just below the service pin will light to
indicate that you have successfully pressed the service pin. This will send the module’s Neuron ID through the
network to the CSM.
4. Verify that the Neuron ID of the desired remote I/O module has automatically been entered into the correct Neuron ID
location of the Device Addressing screen
5. Press “SAVE CHANGES” on the Device Addressing screen
This procedure performs the L
ONWORKS network administration tasks of commissioning and binding a LONWORKS device.
To remove or replace a Remote I/O module from the CSM’s L
ONWORKS network, follow the same procedures listed
previously for a chiller.
Setting up the CSM’s Chiller Data
The CSM requires you to enter certain details of the connected chillers to perform proper chiller sequencing and control.
The inputs are located on the Chiller Setup screen and described in Table 5.
Table 5. Chiller Setup (Main > Configuration > Chiller Setup)
Name Description
Type The Type variables tell the CSM what types of chillers are connected to it. The chiller type can be Centrifugal, Dual Centrifugal,
Screw (air-cooled), Screw (water-cooled), Scroll (air-cooled), Scroll (water-cooled), or Frictionless. Default = “N/A.”
Number of
Compressors
The Number of Compressors variables tells the CSM how many compressors exist on a McQuay centrifugal chiller (1 or 2
representing single or dual centrifugal). For McQuay screw or scroll chillers, this variable tells the CSM how many circuits exist
on the chiller. The CSM calculates chiller availability based on the percentage of compressors (or circuits) on an individual chiller
that is available to run. Examples: Centrifugal Chiller = 1, Dual Centrifugal Chiller = 2, Three Circuit Screw = 3. Default = 1
Tonnage The Tons variables tell the CSM the nominal capacity of the chillers connected to it. The CSM determines when to disable the
Next-OFF chiller based on the capacity which would be lost by disabling it and the spare capacity of the remaining enabled chillers.
Flow Rate The Flow Rate variables tell the CSM the flow rate through the evaporator of each chiller. If the Chiller Sequence Control Type =
Decoupled, the CSM determines when to it can disable the Next-OFF chiller by comparing the primary water flow that will be lost
to the decoupler line flow rate (from supply to return). If a chiller’s evaporator is series-piped with another chiller, this Flow Rate
variable must be the same for both chillers.
This Chiller is
Series-Piped
With Chiller #
This input tells the CSM which (if any) chiller number has it’s evaporator piped in series (see Figure 13) with this chiller. If this
chiller number is not series-piped with another chiller, leave this value = 0. If this chiller is series-piped, enter the chiller number of
the other chiller making up the pair. Special logic will be used when staging series piped chillers. Both chillers forming the series-
piped pair must have this variable set. For example, if chiller 1 is series-piped with chiller 5, the “This Chiller Is Series-Piped With
Chiller #” variable in Chiller # 1’s row must = 5 and the “This Chiller Is Series-Piped With Chiller #” variable in Chiller # 5’s row
must = 1. Default = 0
Receive
Heartbeat
This input defines the length of time (in seconds) the chiller waits without receiving a command from the CSM before determining
that communications have been lost. An input of 250 seconds or more is recommended for the Receive Heartbeat if the Comm Loss
Control at the Chiller feature will be used. This allows for a minimum of two missed communications between the CSM and
chiller. Range = 0 seconds and any number of seconds greater than 200. Default = 0 seconds (Comm loss features disabled)
Comm
Loss/Power Up
State
This input tells the chiller unit controller’s LONWORKS communication module what state to be in if communications is lost with
the CSM. If the Receive Heartbeat value = 0 (default) the chiller will ignore the value of this input and continue to run with its last
received chiller enable setpoint from the CSM. Range = Disable, Enable. Default = Disable
Comm Loss –
Cool Setpoint
This input tells the chiller unit controller’s LONWORKS communication module what cooling setpoint to use if communications are
lost with the CSM. If the Receive Heartbeat value = 0 (default) the chiller will ignore the value of this input and continue to run
with its last received cooling setpoint from the CSM. Default = 44.0°F (6.6°C)
Comm Loss –
Defaults
This read-only value of Comm Loss Defaults indicates how the chiller will respond when communications are lost with the CSM.
This value should always read “Off”. Unreliable Comm Loss Power Up State and Comm Loss Cool Setpoints may result if it does
not read “Off”
Run Time Reset The Run Time Reset variables tell the CSM what the current chiller runtime value is for an existing chiller. The CSM uses chiller
runtime when determining which chiller is to be the next chiller it will enable when multiple chillers in a row have the same
sequence number.
Solid State
Starter
The Solid State Starter variables tell the CSM if the chiller has a solid state starter. If Yes is selected, the solid state starter
variables will be displayed on the Misc page. This variable applies only to MicroTech II chillers. Default = No .
Evaporator Flow
Sensor
The Evaporator Flow Sensor variables tell the CSM if the chiller has an evaporator flow sensor. If Yes is selected, the evaporator
flow rate will be displayed on the Misc page. This variable applies only to MicroTech II chillers. Default = No .
Condenser Flow The Condenser Flow Sensor variables tell the CSM if the chiller has a condenser flow sensor. If Yes is selected, the condenser flow
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