Carrier AquaSnap 30MPA Series - Configuring Return Temperature Reset; Outdoor-Air Temperature Reset; Return Fluid Reset; Space Temperature Reset

33
Table 30 — Configuring Return Temperature Reset
MODE
(RED LED)
KEYPAD
ENTRY
SUB-MODE
KEYPAD
ENTRY
ITEM DISPLAY
ITEM
EXPANSION
COMMENT
CONFIGURATION
DISP TEST ON/OFF TEST DISPLAY LEDs
UNIT TYPE X UNIT TYPE
OPT1 FLUD X COOLER FLUID
OPT2 CTRL X CONTROL METHOD
CCN
EXV.A
RSET CRST 3 COOLING RESET TYPE
0 = No Reset
1 = 4 to 20 mA Input (EMM required)
(Connect to EMM TB6-2,3)
2 = Outdoor-Air Temperature
3 = Return Fluid
4 = Space Temperature
(Connect to TB5-5,6)
RT.NO 10.0 F
RETURN FLUID - NO
RESET TEMP
Default: 10.0 F (5.6 C)
Range: 0° to 30 F COOLER DT
(0.0 to 16.7 C)
RT.F 2.0 F
RETURN FLUID - FULL
RESET TEMP
Default: 0 F (–17.8 C)
Range: 0° to 30 F COOLER DT
(0.0 to 16.7 C)
RT.DG 5.0 F
RETURN - DEGREES
RESET
Default: 0 F (0 C)
Range: –30 to 30°F (–16.7 to 16.7 C)
ENTER
ENTER
ENTER
ENTER
ENTER
ENTER
LEGEND
LWT — Leaving Water (Fluid) Temperature
Fig. 19 — Outdoor-Air Temperature Reset
LEGEND
LWT — Leaving Water (Fluid) Temperature
Fig. 20 — Space Temperature Reset
LEGEND
Fig. 21 — Standard Chilled Fluid
Temperature Control — No Reset
EWT —
Entering Water (Fluid) Temperature
LWT —
Leaving Water (Fluid) Temperature
DESIGN RISE
EWT
LWT
LWT TEMPERATURE (F)
LWT TEMPERATURE (C)
54
54
50
48
46
44
42
12.2
11.1
10.0
8.9
7.8
6.7
5.6
010203040506070 80 90 100
% UNIT LOADING
SET POINT — 44 F
DESIGN RISE — 10 F
0
1
2
3
4
5
6
7
8
9
10
0123 45678 910
Reset Amount (°F or °C)
ΔT (°F or °C), Entering Fluid Temperature - Leaving Fluid Temperature
RT.DG = 5
DESIGN RISE
CHANGE IN CHILLED
FLUID, ΔT
CHANGE IN
LIMIT SETPOINT
RESET AMOUNT RT.NO = 10
RT.F = 2
Fig. 22 — Return Fluid Reset