vide cooling to the space when required. Should the capacity be insufficient for a period greater than 5 minutes, or should a high humidity condition occur, then the compressor will be started to satisfy the load. Should the SAT reach the minimum cooling SAT limit, the economizer valve will close during compressor operation.
Heating — Additionally, the economizer control will open the water valve should the entering water loop temperature be suit- able for heating (at least 5° F above space temperature) and heat is required. The valve will be controlled in a similar man- ner except to satisfy the heating requirement. Should the coil capacity be insufficient to satisfy the space load for more than 5 minutes, then the compressor will be started to satisfy the load. Should the SAT reach the maximum heating SAT limit, the economizer valve will close during compressor operation.
DEMAND LIMIT — The WSHP Open controller has the ability to accept three levels of demand limit from the network. In response to a demand limit, the unit will decrease its heating set point and increase its cooling set point to widen the range in order to immediately lower the electrical demand. The amount of temperature adjustment in response is user adjustable for both heating and cooling and for each demand level. The re- sponse to a particular demand level may also be set to zero.
CONDENSER WATER LINKAGE — The control pro- vides optimized water loop operation using an universal con- troller (UC) open loop controller. Loop pump operation is auto- matically controlled by WSHP equipment occupancy sched- ules, unoccupied demand and tenant override conditions. Positive pump status feedback prevents nuisance fault trips. The condenser water linkage operates when a request for con- denser water pump operation is sent from each WSHP to the loop controller. This request is generated whenever any WSHP is scheduled to be occupied, is starting during optimal start (for
COMPLETE C AND DELUXE D BOARD
SYSTEM TEST
Test mode provides the ability to check the control opera- tion in a timely manner. The control enters a
Test Mode — To enter Test mode, cycle the fan 3 times within 60 seconds. The LED will flash a code representing the last fault when entering the Test mode. The alarm relay will also power on and off during Test mode. See Tables 27 and 28. To exit Test mode, short the terminals for 3 seconds or cycle the fan 3 times within 60 seconds.
NOTE: The flashing code and alarm relay cycling code will both have the same numerical label. For example, flashing code 1 will have an alarm relay cycling code 1. Code 1 indi- cates the control has not faulted since the last power off to power on sequence.
Table 27 — Complete C Control Current LED
Status and Alarm Relay Operations
LED STATUS | DESCRIPTION OF OPERATION | ALARM RELAY | ||
|
| Normal Mode | Open | |
| On | Normal Mode with | Cycle | |
| (closed 5 sec., | |||
|
| PM Warning | ||
|
| open 25 sec.) | ||
|
|
| ||
| Off | Complete C Control is | Open | |
| ||||
|
|
| ||
Slow Flash | Fault Retry | Open | ||
Fast Flash | Lockout | Closed | ||
Slow Flash |
| Open, | ||
Over/Under Voltage Shutdown | (Closed after | |||
|
|
| 15 minutes) | |
Flashing Code 1 | Test Mode — No fault in memory | Cycling Code 1 | ||
Flashing Code 2 | Test Mode — | Cycling Code 2 | ||
HP Fault in memory | ||||
|
|
| ||
Flashing Code 3 | Test Mode — | Cycling Code 3 | ||
LP Fault in memory | ||||
|
|
| ||
Flashing Code 4 | Test Mode — | Cycling Code 4 | ||
FP1 Fault in memory | ||||
|
|
| ||
Flashing Code 5 | Test Mode — | Cycling Code 5 | ||
FP2 Fault in memory | ||||
|
|
| ||
Flashing Code 6 | Test Mode — | Cycling Code 6 | ||
CO Fault in memory | ||||
|
|
| ||
Flashing Code 7 | Test Mode — Over/Under | Cycling Code 7 | ||
shutdown in memory | ||||
|
|
| ||
Flashing Code 8 | Test Mode — PM in memory | Cycling Code 8 | ||
Flashing Code 9 | Test Mode — FP1/FP2 | Cycling Code 9 | ||
Swapped Fault in memory | ||||
|
|
| ||
| LEGEND |
| ||
CO | — Condensate Overflow |
| ||
FP | — Freeze Protection |
| ||
HP | — High Pressure |
| ||
LED | — |
| ||
LP | — Low Pressure |
| ||
PM | — Performance Monitor |
| ||
NOTES:
1.Slow flash is 1 flash every 2 seconds.
2.Fast flash is 2 flashes every 1 second.
3.EXAMPLE: “Flashing Code 2” is represented by 2 fast flashes followed by a
Table 28 — Complete C Control LED Code and
Fault Descriptions
LED | FAULT | DESCRIPTION | ||
CODE | ||||
|
| |||
| 1 | No fault in memory | There has been no fault since | |
|
|
| the last | |
|
|
| up sequence | |
| 2 | HP switch opens instantly | ||
| 3 | LP switch opens for | ||
|
|
| 30 continuous seconds before | |
|
|
| or during a call (bypassed for | |
|
|
| first 60 seconds) | |
| 4 | Freeze Protection Coax | FP1 below Temp limit for | |
|
| — FP1 | 30 continuous seconds | |
|
|
| (bypassed for first 60 seconds of | |
|
|
| operation) | |
| 5 | Freeze Protection Air Coil — | FP2 below Temp limit for | |
|
| FP2 | 30 continuous seconds | |
|
|
| (bypassed for first 60 seconds of | |
|
|
| operation) | |
| 6 | Condensate overflow | Sense overflow (grounded) for | |
|
|
| 30 continuous seconds | |
| 7 | Over/Under Voltage | "R" power supply is <19VAC or | |
(Autoreset) | Shutdown | >30VAC | ||
| 8 | PM Warning | Performance Monitor Warning | |
|
|
| has occurred. | |
| 9 | FP1 and FP2 | FP1 temperature is higher than | |
|
| Thermistors are swapped | FP2 in heating/test mode, or | |
|
|
| FP2 temperature is higher than | |
|
|
| FP1 in cooling/test mode. | |
| LEGEND |
| ||
FP | — Freeze Protection |
| ||
HP | — High Pressure |
| ||
LED | — |
| ||
LP | — Low Pressure |
| ||
PM | — Performance Monitor |
| ||
42
