Lennox HARMONY II, Руководство по установке, Страница: 7 / 30

Page 7
HARMONY III
T
SERIES
Variable-Speed Blower Unit − Jumper Settings
Locate the BDC3 board in the blower control box. Jumper
settings on the BDC3 board control the blower CFM.
Before connecting the zone control board to the BDC3
board, complete the following electrical adjustments.
Figure 7
Blower Coil Control Box
1
4
7
3
6
9
K20 INDOOR
BLOWER RELAY
JUMPER
DS − Y1
JUMPER
Y1 − Y2
JUMPER
R − W2
JUMPER
R − O
JP1
CUT
wire near the
BDC3 board
JP1 pin 2
then,
RE−ROUTE
to G terminal
1. Electrical Adjustments − BDC3 Board
D
IF 2-stage outdoor unit − remove jumper Y1 − Y2
(see figure 7).
D
IF heat pump − cut jumper R − O.
D
In all cases − remove jumper DS − Y1.
D In all cases − the wire from K20 terminal 4 to
BDC3 board JP1 pin 2 must be re−routed to estab-
lish an electrical connection between K20 terminal
4 and terminal G, as shown in figure 7. Cut the wire
near JP1 pin 2. Using the wire still connected to
K20 terminal 4, strip the cut end and connect it to
terminal G. Tape the exposed end of the short JP1
pin 2 wire.
D
In all cases − remove any factory−installed jumper
between terminal R and W1, W2, or W3.
D
In all cases − cut and tape wire 7 (see figure 8) on
the VSM harness that runs from the BDC3 board
to the motor.
9
Figure 8
4
5
1
12
2
11
13
3
9
10
7
8
6
14
15
(LOOK FOR
RAISED NUMBERS
ON BACK OF
PLUG)
CUT & TAPE WIRE #7
BDC3 Board Cable Modifications
2. Set the upper limit of blower CFM as follows:
D
Determine the maximum system CFM require-
ments (sum of all the individual zones).
D From the Blower Motor Performance table in the
unit’s installation instructions, determine the
COOL Speed jumper setting that corresponds to
this CFM.
D
Set the COOL Speed jumper setting on the BDC3
board to this value.
For more information on setting blower speed, refer to sec-
tion on Blower Speed and Adjustment" in the blower unit’s
installation instructions.
BDC3 Control Board Selections
JP1 15 PIN PLUG
(BOARD TO MOTOR)
1
2
3
4
1
2
3
4
1
2
3
4
TEST
−
+
NORM
ADJUST HEAT COOL DELAY
CFM RUN
24V/1A
ACC
JP1
ACCESSORY RELAY CONTACTS (DRIVES
OPTIONAL ACCESSORY RELAY)
OPERATIONAL SELECTOR PINS
(Affects both heating and cooling modes)
DIAGNOSTIC
LEDS
FAN DELAY
SELECTOR PINS
MAXIMUM CFM SELEC-
TION (see note) NOT USED
NOTE − Minimum
blower CFM is not
adjustable.
Figure 9