20
256
2
12 13A
13B
13C
1
2
3
TO MOTOR(S)
BLK
YEL
BLU
FROM FUSE BLOCK
B
TO PRESSURE
TRANSDUCER
1
2
5
6
1
12
2
14
13A
13B
13C
15
25
2
30
31
TXA
TXB
COM
+5V
TERMINAL
BLOCK
L1
L2
L3
T1 T2 T3 B- B+
PRESSURE
TRANSDUCER
C10773
Fig. 22 -- MM--V Bypass Conns PT Conns
Bypass Motormaster Controller and LAS
To bypass the 32LT and run outdoor fan motors OFM1
and OFM2 at full speed:
1. Disconnect power to unit.
2. At terminal block TB2--1, disconnect the BLK wire
from the 32LT Speed Control device. See Fig.
?“E16”.
3. Fabricate a jumper wire to connect TB2--1 to relay
OFR terminal 6.
4. Fabricate a jumper wire to connect TB2--1 to TB2--2.
5. Restore power to unit.
6. On restart, confirm all three outdoor fans are running
at full speed.
When the charge check/adjustment procedure is complete,
restore the 32LT and fan staging functions by
disconnecting unit power, then reversing steps 4 through 2
above. Restore power to the unit.
Charge check and adjustment
Adjust the humidistat setting to highest setpoint possible
(no demand). Start/run the unit in base Cooling mode.
Check and adjust unit charge for each circuit.
Read the discharge pressure gauge; record the pressure.
Read the liquid line temperature. Plot the test discharge
pressure (using the X--axis) and test liquid temperature
(using the Y--axis) on the unit charging chart. If the
plotted test condition point is to the left/above the
charging curve, add refrigerant. If the plotted test
condition is to the right/below the charging curve,
carefully recover some of the charge.
Allow the unit to operate in Cooling mode for
approximately five minutes, then recheck conditions
against the charging chart. Repeat the charge adjustment
procedure until the plotted test condition falls on the
charging curve.
Change unit mode to Reheat2. Adjust the humidistat to
lowest possible setting, then adjust the thermostat to a
high setting until there is no demand on Y1. Allow the
unit to operate in Reheat2 mode for approximately five
minutes, then return the unit to Cooling mode. Recheck
conditions against the charging chart. If charge adjustment
is necessary, then repeat the steps in this paragraph until
no charge adjustment is necessary. When no more charge
adjustment is necessary after switching from Reheat2
mode back to Cooling mode, then charge adjustment
procedure is complete.
When charging procedure is completed, remove the
bypass wiring on the Motormaster control. Readjust the
cooling thermostat setting and the humidistat setting to
appropriate design setpoints.
48TC
Summary of Contents for 48TC 04 Series
Page 27: ...27 COOLING CHARGING CHARTS cont C14064 Fig 33 Cooling Charging Charts 12 5 Ton 48TC...
Page 29: ...29 COOLING CHARGING CHARTS cont C13218 Fig 35 Charging Chart 48TC Size D16 48TC...
Page 40: ...40 C14052 Fig 51 Typical Smoke Detector System Wiring 48TC...
Page 122: ...122 APPENDIX III WIRING DIAGRAMS C12413 Fig 103 48TC A04 A07 Power Diagram 208 230 1 60 48TC...
Page 124: ...124 APPENDIX III WIRING DIAGRAM LIST C12415 Fig 105 48TC A04 A07 Power Diagram 575 3 60 48TC...
Page 126: ...126 APPENDIX III WIRING DIAGRAM LIST C13246 Fig 107 48TC A08 A12 Power Diagram 575 3 60 48TC...
Page 128: ...128 APPENDIX III WIRING DIAGRAM LIST C13247 Fig 109 48TC D08 D12 Power Diagram 575 3 60 48TC...
Page 130: ...130 APPENDIX III WIRING DIAGRAM LIST C13249 Fig 111 48TC D14 Power Diagram 575 3 60 48TC...
Page 139: ...139 APPENDIX III WIRING DIAGRAMS C12423 Fig 120 48TC D16 Power Diagram 575 3 60 48TC...
Page 143: ...143 APPENDIX III WIRING DIAGRAM LIST C13485 Fig 124 48TC 16 PremierLink Control Diagram 48TC...
Page 145: ...145 APPENDIX III WIRING DIAGRAM LIST C13487 Fig 126 48TC 16 RTU Open Control Diagram 48TC...
Page 146: ...146 APPENDIX III WIRING DIAGRAM LIST C14124 Fig 127 48TC D08 14 E08 14 W7220 2 Speed IFM 48TC...
