Temperature Reset - Carrier AQUASNAP MPW015-045 Operation And Service Manual

Table 21 — Dual Chiller Configuration (Master Chiller Example) (cont)
SUB-MODE ITEM
RSET
LLBL
LLBD
LLDY
LLDY
PARA
NOTES:
1. Master Control Method (CTRL) can be configured as 0-Switch, 2-Occupancy or 3-CCN.
2. Parallel Configuration (PARA) cannot be changed.
PART
NUMBER
10HB50106801 3.10 (78.7)
10HB50106802 4.10 (104.1)
A
B
1/4 N.P.T.
Fig. 14 — Dual Leaving Water Thermistor Well
KEYPAD ENTRY DISPLAY
2
ENTER
LLBL
ESCAPE
LLBD
168
ENTER
LLBD
ESCAPE
LLDY
5
ENTER
5
ENTER
10
10
ENTER
LLDY
ESCAPE
RSET
ESCAPE
YES
ENTER
DIMENSIONS in. (mm)
A B
1.55 (39.4)
1.28 (32.5)
0.505/0.495
6" MINIMUM
CLEARANCE FOR
THERMISTOR
REMOVAL
ITEM EXPANSION
LEAD/LAG BALANCE SELECT
LEAD/LAG BALANCE DELTA
LEAD/LAG BALANCE DELTA
LAG START DELAY
LAG START DELAY
Temperature Reset —
handling leaving-fluid temperature reset based on return cooler
fluid temperature. Because the change in temperature through
the cooler is a measure of the building load, the return tempera-
ture reset is in effect an average building load reset method.
The control system is also capable of temperature reset based
on outdoor-air temperature (OAT), space temperature (SPT), or
from an externally powered 4 to 20 mA signal. Accessory sen-
sors must be used for SPT reset (33ZCT55SPT) and for OAT
reset (HH79NZ014). The energy management module (EMM)
0.61
DIA
must be used for temperature reset using a 4 to 20 mA signal.
See Tables 23 and 24.
27
COMMENTS
CHANGE ACCEPTED
DEFAULT 168
SCROLLING STOPS
VALUE FLASHES
SELECT 10
CHANGE ACCEPTED
MASTER COMPLETE
The control system is capable of