20
Reversing valve control
The DFB has two outputs for unit reversing valve control. Opera-
tion of the reversing valves is based on internal logic; this applica-
tion does not use an “O” or “B” signal to determine reversing
valve position. Reversing valves are energized during the cooling
stages and the defrost cycle and de-energized during heating cy-
cles. Once energized at the start of a cooling stage, the reversing
valve will remain energized until the next heating cycle demand is
received. Once de-energized at the start of a Heating cycle, the re-
versing valves will remain de-energized until the next cooling
stage is initiated.
Compressor control
The DFB receives inputs indicating Stage 1 Cooling, Stage 2
Cooling and Stage 1 Heating from the space thermostat or unit
control system (PremierLink™ controller or RTU Open control-
ler); it generates commands to start compressors with or without
reversing valve operation to produce Stage 1 Cooling (one com-
pressor runs), Stage 2 Cooling (both compressors run) or Stage 1
Heating (both compressors run).
Fig. 34 — Defrost Control Board Location
NOTES:
1. Jumper for 1-3 seconds: Factory Test — The defrost interval timing is reduced
b
y a factor of 0.1 seconds/minute
b
ased on the positions of DIP
switches SW1 and SW2 (i.e. 90 minutes will
b
e reduced to 9 seconds).
2. Jumper for 5-20 seconds: Forced Defrost — Defrost runs for 30 seconds if DFT2 is open.
Table 3 — 50TCQ Defrost Board I/O and Jumper Configurations
POINT NAME
TYPE OF I/O
CONNECTION PIN NUMBER
UNIT CONNECTION
NOTE
INPUTS
G Fan
DI, 24 vac
P2-3
CTB-G
Y1 Cool 1
DI, 24 vac
P2-5
CTB-Y1
Y2 Cool 2
DI, 24 vac
P2-4
CTB-Y2
W1 Heat 1
DI, 24 vac
P2-7
CTB-W1
W2 Heat 2
DI, 24 vac
P2-6
CTB-W2
R Power
24 vac
P3-1
CONTL BRD-8
C Common
24 vac
P3-2
CONTL BRD-4
DFT 1
DI, 24 vac
DFT-1 to DFT-1
—
DFT 2
DI, 24 vac
DFT-2 to DFT-2
—
OUTPUTS
IFO Fan On
DO, 24 vac
P3-9
REHEAT/HP-2
OF OD Fan On
DO, 24 vac
OF
OFR
RVS1
DO, 24 vac
P3-7 to P3-5
—
Energize in COOL
RVS2
DO, 24 vac
P3-6 to P3-4
—
Energize in COOL
COMP 1
DO, 24 vac
P3-10
FPT1-REHEAT/HP-6
COMP2
DO, 24 vac
P3-8
FPT2-REHEAT/HP-8
HEAT 2
DO, 24 vac
E-HEAT
TB4-1
COM
24 vac
P3-3
TB4-3
CONFIGURATION
Select Jumper
24 vac
P1-1
—
2 Compressor
24 vac
P1-3
—
Use for 50TCQD
SPEED-UP CONFIGURATION
Speed-Up Jumper
—
JMP17
—
Speed-Up Jumper
—
JMP18
—
Содержание WeatherMaster 50HCQ 04 Series
Страница 4: ...4 Fig 2 50HCQ 04 06 Units Built On and After 4 15 2019 ...
Страница 5: ...5 Fig 3 50HCQ 04 06 Units Built Prior to 4 15 2019 ...
Страница 6: ...6 Fig 4 50HCQ 04 06 Corner Weights and Clearances ...
Страница 7: ...7 Fig 5 50HCQ 04 06 Base Rail Details ...
Страница 8: ...8 Fig 6 50HCQ 04 06 Thru the Base Charts ...
Страница 23: ...23 Fig 41 Electro Mechanical Control Wiring 208 230v 460v ...
Страница 24: ...24 Fig 42 Electro Mechanical Control Wiring 575v ...
Страница 25: ...25 Fig 43 Electro Mechanical Power Wiring 208 230 1 60 ...
Страница 26: ...26 Fig 44 Electro Mechanical Power Wiring 208 230 3 60 ...
Страница 27: ...27 Fig 45 Electro Mechanical Power Wiring 460 3 60 ...
Страница 28: ...28 Fig 46 Electro Mechanical Power Wiring 575 3 60 ...
Страница 29: ...29 Fig 47 PremierLink Wiring Schematic 208 230 460v ...
Страница 30: ...30 Fig 48 PremierLink Wiring Schematic 575v ...
Страница 31: ...31 Fig 49 RTU Open System Control Wiring ...