50
Fig. 71 — EconoMi$er IV Controller Potentiometer
and LED Locations
Fig. 72 — Outside Air Temperature Changeover Set
Points
Fig. 73 — Outdoor-Air Damper Leakage
Differential Dry Bulb Control
For differential dry bulb control, the standard outdoor dry bulb
sensor is used in conjunction with an additional accessory dry bulb
sensor (P/N: CRTEMPSN002A00). The accessory sensor must be
mounted in the return airstream. See Fig. 74. Wiring is provided in
the EconoMi$er IV wiring harness.
In this mode of operation, the outdoor-air temperature is compared
to the return-air temperature and the lower temperature airstream
is used for cooling. When using this mode of changeover control,
turn the enthalpy set point potentiometer fully clockwise to the D
setting. See Fig. 71.
OUTDOOR ENTHALPY CHANGEOVER
For enthalpy control, accessory enthalpy sensor (P/N:
HH57AC078) is required. Replace the standard outdoor dry bulb
temperature sensor with the accessory enthalpy sensor in the same
mounting location. See Fig. 75. When the outdoor air enthalpy ris-
es above the outdoor enthalpy changeover set point, the outdoor-
air damper moves to its minimum position. The outdoor enthalpy
changeover set point is set with the outdoor enthalpy set point po-
tentiometer on the EconoMi$er IV controller. The set points are A,
B, C, and D. See Fig. 76. The factory-installed 620-ohm jumper
must be in place across terminals S
R
and SR+ on the EconoMi$er
IV controller.
Fig. 74 — Return Air Temperature or Enthalpy Sensor
Mounting Location
Fig. 75 — EconoMi$er IV Control
LED ON
LED ON
LED ON
LED ON
LED OFF
19
1
8
LED OFF
LED OFF
LED OFF
17
16
15
14
1
3
12
11
10
9
40
45
50
55
60
65
70
75
8
0
8
5
90
95
100
DEGREE
S
FAHRENHEIT
mA
D
C
B
A
0
5
10
15
20
25
3
0
0.1
3
0.20
0.22
0.25
0.
3
0
0.
3
5
0.40
0.45
0.50
S
TATIC PRE
SS
URE (in. wg)
FLOW
IN
CUBIC
FEET
PER
MINUTE
(cfm)
ECONOMI$ER IV
ECONOMI$ER IV
CONTROLLER
GROMMET
RETURN AIR
S
EN
S
OR
RETURN DUCT
(FIELD-PROVIDED)
TR1
24 V
a
c
COM
TR
24
V
a
c
HOT
1
2
3
4
5
EF
EF1
+
_
P1
T1
P
T
N
EXH
2V
10V
EXH
S
et
S
et
2V
10V
2V
10V
DCV
DCV
Free
Cool
B
C
A
D
S
O+
S
R+
S
R
S
O
AQ1
AQ
DCV
Min
Po
s
Open
M
a
x
N1
Summary of Contents for WeatherMaster 48HC04 Series
Page 37: ...37 Fig 60 Integrated Gas Control IGC Board RED LED STATUS ...
Page 45: ...45 Fig 65 RTU Open Overlay for Economizer Wiring ...
Page 46: ...46 Fig 66 VFD Overlay for W2770 Controller Wiring ...
Page 98: ...98 Fig E 48HC A07 YAC Control Diagram 208 230 3 60 460 575 3 60 APPENDIX D WIRING DIAGRAMS ...
Page 100: ...100 Fig G 48HC D11YAC Control Diagram 208 230 3 60 460 575 3 60 APPENDIX D WIRING DIAGRAMS ...
Page 101: ...101 Fig H 48HC D12 YAC Control Diagram 208 230 3 60 460 575 3 60 APPENDIX D WIRING DIAGRAMS ...
Page 102: ...102 Fig I 48HC A04 A06 YAC Power Diagram 208 230 1 60 APPENDIX D WIRING DIAGRAMS ...
Page 103: ...103 Fig J 48HC A04 A06 YAC Power Diagram 208 230 3 60 460 3 60 APPENDIX D WIRING DIAGRAMS ...
Page 104: ...104 Fig K 48HC A04 A06 YAC Power Diagram 575 3 60 APPENDIX D WIRING DIAGRAMS ...
Page 107: ...107 Fig N 48HC A07 A12 YAC Power Diagram 208 230 3 60 460 3 60 APPENDIX D WIRING DIAGRAMS ...
Page 108: ...108 Fig O 48HC A07 A12 YAC Power Diagram 575 3 60 APPENDIX D WIRING DIAGRAMS ...
Page 109: ...109 Fig P 48HC D08 D09 YAC Power Diagram 230 460 3 60 APPENDIX D WIRING DIAGRAMS ...
Page 110: ...110 Fig Q 48HC D08 D09 YAC Power Diagram 575 3 60 APPENDIX D WIRING DIAGRAMS ...
Page 111: ...111 Fig R 48HC D11 YAC Power Diagram 208 230 3 60 APPENDIX D WIRING DIAGRAMS ...
Page 112: ...112 Fig S 48HC D11 YAC Power Diagram 460 3 60 APPENDIX D WIRING DIAGRAMS ...
Page 113: ...113 Fig T 48HC D11 YAC Power Diagram 575 3 60 APPENDIX D WIRING DIAGRAMS ...
Page 114: ...114 Fig U 48HC D12 YAC Power Diagram 230 460 3 60 APPENDIX D WIRING DIAGRAMS ...
Page 115: ...115 Fig V 48HC D12 YAC Power Diagram 575 3 60 APPENDIX D WIRING DIAGRAMS ...
Page 116: ...116 Fig W 48HC D14 YAC Control Diagram 208 230 3 60 460 575 3 60 APPENDIX D WIRING DIAGRAMS ...
Page 117: ...117 Fig X 48HC D14 YAC Power Diagram 208 230 3 60 APPENDIX D WIRING DIAGRAMS ...
Page 118: ...118 Fig Y 48HC D14 YAC Power Diagram 460 3 60 APPENDIX D WIRING DIAGRAMS ...
Page 119: ...119 Fig Z 48HC D14 YAC Power Diagram 575 3 60 APPENDIX D WIRING DIAGRAMS ...
Page 142: ...142 Fig AW PremierLink System Control Wiring Diagram System APPENDIX D WIRING DIAGRAMS ...
Page 144: ...144 Fig AY RTU Open Wiring Diagram APPENDIX D WIRING DIAGRAMS ...