Carrier GTR040-420 Spezifikationen PDF herunterladen (Seite 18)

The capacity control algorithm runs every 30 seconds. The

algorithm attempts to maintain the leaving chilled water tem-

perature at the control point. Each time it runs, the control reads

the entering and leaving fluid temperatures. The control deter-

mines the rate at which conditions are changing and calculates

2 variables based on these conditions. Next, a capacity ratio is

calculated using the 2 variables to determine whether or not to

make any changes to the current stages of capacity. This ratio

value ranges from –100 to + 100%. If the next stage of capacity

is a compressor, the control starts (stops) a compressor when

the ratio reaches +100% (–100%). If the next stage of capacity

is an unloader, the control deenergizes (energizes) an unloader

when the ratio reaches +60% (–60%). Unloaders are allowed to

cycle faster than compressors, to minimize the number of starts

and stops on each compressor. A capacity stage delay of

90 seconds occurs after each capacity step change.

CEBD430351-0396-01C

TEST 1

CEPL130351-01

PWR

TEST 2

J4 J3

LEN

STATUS

RED LED - STATUS

GREEN LED -

LEN (LOCAL EQUIPMENT NETWORK)

ADDRESS

DIP SWITCH

Fig. 16 — Energy Management Module

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Carrier GTR040-420 Spezifikationen Seite 18