Blower Speed Selection - Bryant HRVBBLHU Installation, Start-Up, And Operating Instructions Manual

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