5. Push in door switch, this will initiate a low-speed exchange.
IV. BLOWER SPEED SELECTION
Three-speed blowers are factory connected to electronic control
board on HIGH- and LOW-speed taps of blowers. Installer can
easily change low-speed tap to medium-speed tap so electronic
control will select between high and medium speed. Connections
can be changed at motor location (See Tables 7 and 8).
To change low speed to medium speed, proceed as follows:
1. Unplug unit from 115vac.
2. Locate blower assembly.
3. Locate red wire and blue wire coming from blower assem-
bly.
4. Unplug red wire from quick connect.
5. Unplug protecting cap quick connection from blue wire and
put on red wire coming from blower. The cap is a safety
insulator.
6. Connect red wire of main harness to blue wire.
7. Replace wires.
TABLE 5—TROUBLESHOOTING CHART
SYMPTOMS CAUSES SOLUTIONS
Air too humid
Continuous exchange mode
used in small houses
Use Intermittent Mode
Check humidity level settings
Unit not responding to wall control
Defrost condition is in effect
Outdoor temperatue is below 23°F
Unit will operate when not in defrost mode.
Defrost cycle is based on outdoor ambient (see
Table 10)
Broken control wire
Test wall control
Check connections
Check thermistor
Unit stops momentarily Electrical supply interrupted Check units circuit breaker
Air from distribution register too cold Improper calibration of air flow Check calibration of flow rates
Unit makes annoying noise Ventilation wheel out of adjustment Remove the motor and screw wheel on properly
Noise level too high at distribution
registers when in high speed
Air duct system too short Install a duct silencer
TABLE 6—TEMPERATURE/OHM RELATIONSHIP
TEMP F° OHMS
30 34,480
32 32,630
34 30,760
36 29,220
38 27,470
40 26,020
42 24,680
44 23,320
46 22,070
48 20,910
50 19,830
52 18,820
54 17,870
56 16,920
58 16,160
60 15,260
62 14,530
64 13,790
66 13,090
68 12,480
70 11,860
72 11,270
74 10,750
76 10,250
78 9,750
80 9,300
82 8,840
84 8,432
86 8,042
88 7,668
90 7,310
92 6,993
94 6,661
96 6,368
98 6,085
100 5,811
102 5,571
104 5,313
106 5,088
108 4,869
110 4,660
112 4,450
114 4,268
116 4,019
118 3,918
120 3,750
TABLE 7—FACTORY SET BLOWER CONNECTION HIGH
OR LOW SPEED
CONTROL
MODULE
MAIN ELECTRICAL
HARNESS CABLE
BLOWER
WIRE
SPEED
J1-6 Orange Orange High
No Connection No Connection Blue + Cap Medium
J1-4 Red Red Low
TABLE 8—MODIFY BLOWER CONNECTION HIGH
OR MEDIUM SPEED
CONTROL
MODULE
MAIN ELECTRICAL
HARNESS CABLE
BLOWER
WIRE
SPEED
J1-6 Orange Orange High
J1-4 Red Blue Medium
No Connection No Connection Red + Cap Low
TABLE 9—TEMPERATURE AND VOLTAGE
TEMPERATURE
°F (°C)
VOLTAGE DC
VOLTS (J4)
-22 (-30) 3.5
-4 (-20) 2.7
5 (-15) 2.3
14 (-10) 2.0
32 (0) 1.4
41 (5) 1.1
50 (10) 0.9
68 (20) 0.6
—15—
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