Table 21 — Control Methods and Cooling Set Points
| CONTROL | OCCUPANCY |
| COOLING SET POINT SELECT (CLSP) |
| ||
| TYPE | STATE | 0 | 1 | 2 | 3 | |
| (CTRL) | (single) | (dual, switch) | (dual, occ) | (4 to 20 mA) | ||
|
| ||||||
0 | (switch) | Occupied | ON,CSP1 | ON* | ON,CSP1 | ON† | |
Unoccupied | ON,CSP1 | ON* | ON,CSP2 | ON | |||
|
| ||||||
2 | (Occupancy) | Occupied | ON,CSP1 | ON* | Illegal | ON† | |
Unoccupied | OFF | OFF | Illegal | OFF | |||
|
| ||||||
3 | (CCN) | Occupied | ON,CSP1 | ON* | ON,CSP1 | ON† | |
Unoccupied | ON,CSP1 | ON* | ON,CSP2 | ON† | |||
|
|
*Dual set point switch input used. CSP1 used when switch input is open. CSP2 used when switch input is closed. †Cooling set point determined from 4 to 20 mA input to energy management module (EMM) to terminals
4 TO 20 mA INPUT — Unit operation is based on an external 4 to 20 mA signal input to the Energy Management Module (EMM).
Low Sound Mode Operation — All models are fac- tory configured with the Low Sound Mode disabled. In the Configuration mode under
Heating Operation — The chiller can be used for pump outputs or optional
Service Test (See Table 4) — Both main power and control circuit power must be on.
The Service Test function should be used to verify proper operation of condenser fan(s), compressors, minimum load valve solenoid (if installed), cooler pump(s), EXVs, and re- mote alarm relay. To use the Service Test mode, the Enable/ Off/Remote Contact switch must be in the OFF position. Use the display keys and Table 4 to enter the mode and display TEST. Press ENTER twice so that OFF flashes. Enter the password if required. Use either arrow key to change the TEST value to the ON position and press ENTER . Press ESCAPE and the button to enter the OUTS or COMP
Test the condenser fans, cooler pump(s) and alarm relay by changing the item values from OFF to ON. These discrete outputs are then turned off if there is no keypad activity for 10 minutes. Use the arrow keys to select the desired percentage when testing expansion valves and Motormaster® V controller. When testing compressors, lead compressor must be started first. All compressor outputs can be turned on, but the control will limit the rate by staging one compressor per minute. Com- pressor unloaders and hot gas bypass relays/solenoids (if in- stalled) can be tested with the compressors on or off. The relays
under the COMP mode will stay on for 10 minutes if there is no keypad activity. Compressors will stay on until they are turned off by the operator. The Service Test mode will remain enabled for as long as there is one or more compressors run- ning. All safeties are monitored during this test and will turn a compressor, circuit or the machine off if required. Any other mode or
Optional Factory-Installed Hydronic Pack-
age — If the chiller has
The pump(s) in the hydronic package come factory
CAUTION
Operation of pump in wrong direction, even for a few seconds, can cause irreversible damage to pump impeller and housing. Always verify correct wiring/pump rotation before operation.
Use Service Test function to test operation of pumps. Verify that the flow switch input is made when the pump is running. For dual pump hydronic systems, the control only uses one pump at a time. Consult the Installation Instructions supplied with this chiller and use the circuit setter balancing valve installed in hydronic package to adjust fluid flow rate.
Cooler Pump Control — The AquaSnap® 30RAP ma- chines equipped with a
Machines not equipped with a pump package are config- ured with the cooler pump control OFF. It is recommended that the machine control the chilled water pump. If not, a
With or without this option enabled, the cooler pump relay will be energized when the machine enters an ON status (i.e., On Local, On CCN, On Time). An A207 - Cooler Freeze Protection Alarm, will energize the cooler pump relay also, as an override. The cooler pump relay will remain energized if the machine is in MODE 10 – Minimum Off Time.
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