18
Fig. 34 — Defrost Control Board Location — 547K*14 Electromechanical Unit Shown
NOTES:
1. Jumper for 1-3 seconds: Factory Test — The defrost interval timing is reduced by a factor of 0.1 seconds/minute based on the positions of DIP
switches SW1 and SW2 (i.e., 90 minutes will be reduced to 9 seconds).
2. Jumper for 5-20 seconds: Forced Defrost — Defrost runs for 30 seconds if DFT2 is open.
Defrost
The defrost control mode is a time/temperature sequence.
There are 2 time components: The continuous run period and
the test/defrost cycle period. The temperature component is
provided by Defrost Thermostat (DFT2) mounted on the out
-
door coil.
The continuous run period is a fixed time period between the
end of the last defrost cycle (or start of the current Heating cy
-
cle) during which no defrost will be permitted. This period can
be set at 30, 60, 90 or 120 minutes by changing the positions of
DIP switches SW1 and SW2 (see Fig. 35 and Table 4). The de
-
fault run period is 60 minutes.
Fig. 35 — DIP Switch Settings — Defrost Board
Table 3 — 547K 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
SWITCH
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
—
SPEED-UP CONFIGURATION
Speed-Up Jumper
—
JMP17
—
Speed-Up Jumper
—
JMP18
—
Table 4 — DIP Switch Positions
1
2
1
2
1
2
1
2
3
1
•
1
•
1
1
•
•
1
•
On
0
•
0
•
0
•
•
0
0
Off
30 minutes
60 minutes
(factory default)
90 minutes
120 minutes
Fan Delay
Summary of Contents for Legacy 547K 14
Page 4: ...4 Fig 2 547K 14 Unit Dimensional Drawing...
Page 5: ...5 Fig 2 547K 14 Unit Dimensional Drawing cont...
Page 8: ...8 Fig 5 547K 14 Roof Curb Details...
Page 21: ...21 Fig 41 Typical Control Wiring Diagram Electromechanical with W7220 Controller...
Page 22: ...22 Fig 42 Typical Power Wiring Diagram 208 230 460 3 60 Unit Shown...
Page 23: ...23 Fig 43 Typical Power Wiring Diagram 575 3 60 Unit Shown...
Page 41: ......
