Carrier 30GTR Specifications download pdf (Page 17)

The capacity routine runs every 30 seconds. The routine

attempts to maintain the Control Point at the desired set point.

Each time it runs, the control reads the entering and leaving

ﬂuid temperatures. The control determines 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 compres-

sor, 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 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)

Fig. 15 — Energy Management Module

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Carrier 30GTR Specifications Page 17