Carrier HRVCCLHA Installation Instructions Manual page 15

Table 7 – Temperature/Ohm Relationship
TEMP 〈°F/°C)
30/--- 1
32/0
34/1
36/2
38/4
40/5
42/6
44/7
46/8
48/9
50/10
52/11
54/12
56/14
58/15
60/16
62/17
64/18
66/19
68/20
70/21
72/22
74/24
76/25
78/26
80/27
82/28
84/29
86/30
88/31
90/32
92/33
94/34
96/35
98/36
100/38
102/39
104/40
106/41
108/42
110/43
112/44
114/46
116/47
118/48
120/49
Override Test
To use override test function, a thermistor must be connected to the
control board. Unit must not be in defrost mode during an override
test.
HIGH SPEED
1. Disconnect HRV from 115VAC.
1. Unplug wall control wires at control module terminal block in-
side HRV.
2. Plug HRV back to 115VAC.
3. Attach a wire across J3- -8 and J3- -9 (B and G) on control mod-
ule terminal block.
4. Push in door switch, this will initiate a high- -speed exchange.
LOW SPEED
1. Unplug HRV from 115VAC.
2. Disconnect wall control wires at control module terminal block
inside HRV.
3. Plug HRV back to 115VAC.
4. Connect a 3.0 K ohm resistor between J3- -8 and J3- -9 (B and
OHMS
34,480
5. Push in door switch, this will initiate a low- -speed exchange.
32,630
30,760
Blower Speed Selection
29,220
Three- -speed blowers are factory connected to electronic control
27,470
board on HIGH- - and LOW- -speed taps of blowers. Installer can
26,020
easily change low- -speed tap to medium- -speed tap so electronic
24,680
control will select between high and medium speed. Connections
23,320
can be changed at motor location (see Table 8 and 9).
22,070
20,910 To change low speed to medium speed, proceed as follows:
19,830
1. Unplug unit from 115VAC.
18,820
2. Locate blower assembly.
17,870
3. Locate red wire and blue wire coming from blower assembly.
16,920
16,160 4. Unplug red wire from quick connect.
15,260
5. Unplug protecting cap quick connection from blue wire and
14,530
13,790
13,090
6. Connect red wire of main harness to blue wire.
12,480
7. Replace wires.
11,860
11,270
10,750
Table 8 – Factory Set Blower Connection High or Low Speed
10,250
9,750
9,300
8,840
8,432
8,042
No Connection
7,668
7,310
6,993
6,661
Table 9 – Modify Blower Connection High or Medium Speed
6,368
6,085
5,811
5,571
5,313
5,088
4,869
No Connection
4,660
4,450
4,268
4,019
VOLTAGE DC VOLTS (J4)
3,918
3,750
Defrost Cycle
Defrost cycle is controlled by a thermistor which is located in the
fresh- -air intake passage (the thermistor unit is connected to J4 of
control module (see Fig. 19 and 20). When defrost temperature
sensor detects the need for defrost, K5 relay will close for 6
minutes while K1 and K2 remain energized.
This closes the outdoor air damper while running HRV blower on
high- -speed. This process recirculates warm indoor air through heat
recovery core which melts any frost that has formed. Water created
in this process is collected by HRV and drained away. Frequency
of the defrost cycle depends on outdoor temperature (see Table 11).
15
G) on control module terminal block.
put on red wire coming from blower. The cap is a safety insu-
lator.
MAIN
CONTROL ELECTRICAL
MODULE HARNESS
CABLE
J1--- 6 Orange
No Connection
J1--- 4 Red
MAIN
CONTROL ELECTRICAL
MODULE HARNESS
CABLE
J1--- 6 Orange
J1--- 4 Red
No Connection
Table 10 – Temperature and Voltage
3.5
2.7
2.3
2.0
1.4
1.1
0.9
0.6
BLOWER
SPEED
WIRE
Orange High
Blue + Cap Medium
Red Low
BLOWER
SPEED
WIRE
Orange High
Blue Medium
Red + Cap Low
TEMP °F (°C)
--- 22 (--- 30)
--- 4 (--- 20)
4 (--- 15)
14 (--- 10)
32 (0)
41 (5)
50 (10)
68 (20)