MODELS: Q24H2D, Q30H2D, Q36H2D Q42H2D, Q48H2D, Q60H2D MODEL FEATURES

MODELS: Q24H2D, Q30H2D, Q36H2D Q42H2D, Q48H2D, Q60H2D MODEL FEATURES
MODELS:
Bard Manufacturing Company, Inc.
Bryan, Ohio 43506
Q24H2D, Q30H2D, Q36H2D
Q42H2D, Q48H2D, Q60H2D
MODEL FEATURES
This model provides a unique dehumidification circuit for periods of high indoor humidity conditions. Additionally
an “energy recovery ventilator” may be provided to allow for outside ventilation air requirements by eliminating
excessive sensible and latent loads as a result of the increased ventilation requirement.
Refer to specification sheet S3407 for the standard features of the base unit Q**H2D Q-Tec. Electrical data for the
Q**H dehumidification Q-Tec models is identical to the electrical data for the standard QH models.
SPECIAL FEATURES
DEHUMIDIFICATION CIRCUIT
The dehumidification circuit incorporates an independent heat exchanger coil in the supply air stream in addition
to the standard evaporator coil. This coil reheats the supply air after it passes over the cooling coil, and is sized
to nominally match the sensible cooling capacity of the evaporator coil. Extended run times in dehumidification
mode can be achieved using waste heat from the refrigeration cycle to achieve the reheat process, while at the
same time large amounts of moisture can be extracted from the passing air stream. Models that also have electric
heaters installed have the electric heat inhibited during dehumidification mode, although it remains available for
additional reheat during certain conditions. See below for specific operating sequences, and see attached tables for
performance on sensible and latent capacities, water removal ratings, and supply air delivery conditions.
The dehumidification refrigerant reheat circuit is controlled by a 3-way valve directing the refrigerant gas to
the normal condenser during periods when standard air conditioning is required. During periods of time of low
ambient temperature (approximately 65° to 75° outdoor) and high indoor humidity, a humidistat senses the need
for mechanical dehumidification. It then energizes both the compressor circuit and the 3-way valve, thus directing
the hot refrigerant discharge gas into a separate desuperheating condenser circuit which reheats the conditioned
air before it is delivered to the room. The refrigerant gas is then routed from the desuperheating condenser to the
system condenser for further heat transfer. A small capillary tube inserted between the reheat coil return line and
suction line will prevent liquid from accumulating in the reheat coil when it is inactive. This drain does not affect the
normal operation of the system. A check valve is located in the reheat coil return line. It has a soft spring to hold the
ball on the seat. Refer to Page 2 for the location of the check valve and drain back capillary. When the humidistat
is satisfied, the system automatically switches back to normal A/C mode and either continues to operate or turns off
based on the signal from the wall thermostat. The result is separate humidity control at minimum operating cost.
DEHUMIDIFICATION SEQUENCE OF OPERATION
Dehumidification is controlled through a humidistat and is independent of the thermostat. On a call for
dehumidification mode of operation, the compressor and 3-way valve that feeds the reheat coil are energized
through circuit 4-5. Dehumidification will continue until the humidistat is satisfied.
If the room temperature falls below 1st stage heating setpoint, electric heat will be energized by the room thermostat
and cycle to maintain room temperature.
If 2nd stage heating setpoint is reached, dehumidification cycle is de-energized and heat pump heating is energized.
If the mixed (return and ventilation, if used) temperature (measured at the internal filter location) drops below 65°F
during dehumidification cycle, electric heat will cycle to help maintain room temperature to the 65°F condition.
Note: On installations with ventilation package installed and controlled from the O1 terminal on Bard 24V terminal
strip, this feature is inhibited anytime the O1 terminal is energized.
If the unit is operating in heat pump mode and there is a call for dehumidification, the dehumidification mode takes
precedence over the heat pump heating mode. The unit will not return to heating mode until 2nd stage heating is
called for.
Anytime there is a R-Y call for cooling, dehumidification is canceled and the unit will operate in the cooling mode
until satisfied. If dehumidification call is still present when cooling call is satisfied, the unit will continue to operate
and revert to dehumidification mode.
AUGUST 14, 2013
Manual7960-701
Page
1 of 5
COOLING MODE
CIRCUIT DIAGRAM
DEHUMIDIFICATION
MODE
CIRCUIT DIAGRAM
Manual7960-701
Page 2 of 5
Q24H2D Application Performance Data
Indoor
Conditions
Outdoor
Conditions
System Capacity
Pounds of
Water/Hour
Evaporator
Airflow
Approximate
Supply Air
Mode
A/C
vs.
Dehum
DB/WB
% RH
DB
Total
Sensible
Latent
S/T
Lbs.
CFM
DB/WB
65/63
90
65
27,200
11,200
16,000
0.41
15.10
800
52.4 / 51.8
A/C
65/63
90
65
15,200
500
14,700
0.03
13.91
800
64.4 / 57.1
Dehum
75/62.5
50
75
25,100
18,400
6,700
0.73
6.30
800
54.5 / 51.6
A/C
75/62.5
50
75
10,700
5,200
5,500
0.49
5.15
800
69.1 / 58.1
Dehum
75/65.5
60
75
26,700
16,300
10,400
0.61
9.88
800
56.8 / 54.7
A/C
75/65.5
60
75
12,900
3,700
9,200
0.29
8.68
800
70.9 / 60.6
Dehum
75/68
70
75
28,200
14,400
13,800
0.51
12.98
800
59.0 / 57.4
A/C
75/68
70
75
14,600
2,200
12,400
0.15
11.67
800
72.6 /57.3
Dehum
80/67
50
95
25,000
17,800
7,200
0.71
6.82
800
60.3 / 57.3
A/C
80/67
50
95
8,000
2,000
6,000
0.25
5.68
800
77.8 / 64.0
Dehum
Pounds of
Water/Hour
Evaporator
Airflow
Approximate
Supply Air
Mode
Rated CFM 800
Q30H2D Application Performance Data
Indoor
Conditions
Outdoor
Conditions
System Capacity
DB/WB
% RH
DB
Total
Sensible
Latent
S/T
Lbs.
CFM
DB/WB
A/C
vs.
Dehum
65/63
90
65
34,000
14,000
20,000
0.41
18.84
1000
51.4 / 50.6
A/C
65/63
90
65
20,400
1,300
19,100
0.06
18.06
1000
63.8 / 56.0
Dehum
75/62.5
50
75
31,700
22,900
8,800
0.72
8.35
1000
52.8 / 50.7
A/C
75/62.5
50
75
15,600
7,300
8,300
0.46
7.88
1000
72.0 / 62.0
Dehum
75/65.5
60
75
33,700
20,300
13,400
0.60
12.58
1000
55.5 / 53.7
A/C
75/65.5
60
75
17,400
5,000
12,400
0.29
11.73
1000
70.1 / 59.8
Dehum
75/68
70
75
35,500
17,800
17,700
0.50
16.65
1000
57.9 / 56.5
A/C
75/68
70
75
19,500
3,000
16,500
0.15
15.57
1000
72.1 / 62.1
Dehum
80/67
50
95
29,800
21,800
8,000
0.73
7.54
1000
58.9 / 56.5
A/C
80/67
50
95
10,900
2,300
8,600
0.21
8.13
1000
77.7 / 63.5
Dehum
Pounds of
Water/Hour
Evaporator
Airflow
Approximate
Supply Air
Mode
A/C
vs.
Dehum
Rated CFM 1000
Q36H2D Application Performance Data
Indoor
Conditions
Outdoor
Conditions
System Capacity
DB/WB
% RH
DB
Total
Sensible
Latent
S/T
Lbs.
CFM
DB/WB
65/63
90
65
38,400
16,200
21,700
0.42
20.99
1000
49.8 / 49.2
A/C
65/63
90
65
17,400
-2,800
20,200
-0-
19.04
1000
67.7 / 57.4
Dehum
75/62.5
50
75
36,000
24,800
11,200
0.69
10.55
1000
51.4 / 49.1
A/C
75/62.5
50
75
11,800
2,200
9,600
0.18
9.13
1000
72.9 / 58.6
Dehum
75/65.5
60
75
38,000
21,900
16,100
0.58
15.16
1000
54.3 / 52.4
A/C
75/65.5
60
75
14,300
-5,300
19,600
-0-
18.47
1000
75.0 / 61.1
Dehum
75/68
70
75
39,600
19,400
20,200
0.49
19.08
1000
56.6 / 55.1
A/C
75/68
70
75
16,500
-2,100
18,500
-0-
17.47
1000
77.0 / 63.3
Dehum
80/67
50
95
35,600
26,200
9,400
0.72
9.22
1200
59.6 / 57.3
A/C
80/67
50
95
35,000
23,500
11,500
0.67
10.84
1000
57.8 / 55.4
A/C
80/67
50
95
6,300
-3,700
10,000
-0-
9.45
1000
83.6 / 65.2
Dehum
Rated CFM 1200. Shipped from the factory on optional CFM of 1000.
Manual7960-701
Page
3 of 5
Q42H2D Application Performance Data
Indoor
Conditions
Outdoor
Conditions
System Capacity
Pounds of
Water/Hour
Evaporator
Airflow
Approximate
Supply Air
Mode
DB/WB
% RH
DB
Total
Sensible
Latent
S/T
Lbs.
CFM
DB/WB
A/C
vs.
Dehum
65/63
90
65
42,200
17,700
24,500
0.41
23.18
1000
50.2 / 49.4
A/C
65/63
90
65
20,000
-2,900
22,900
-0-
21.58
1000
67.5 / 57.4
Dehum
75/62.5
50
75
39,000
27,000
12,000
0.69
11.26
1000
52.2 / 49.8
A/C
75/62.5
50
75
12,200
2,900
9,300
0.24
8.78
1000
72.6 / 58.8
Dehum
75/65.5
60
75
41,500
23,900
17,600
0.57
16.66
1000
54.9 / 52.9
A/C
75/65.5
60
75
16,300
200
16,100
0.01
15.20
1000
74.7 / 61.0
Dehum
75/68
70
75
43,200
21,300
21,900
0.49
20.68
1000
57.1 / 55.4
A/C
75/68
70
75
18,600
-1,800
20,400
-0-
19.21
1000
76.6 / 63.1
Dehum
80/67
50
95
39,000
27,700
11,300
0.72
10.26
1200
60.2 / 57.3
A/C
80/67
50
95
37,900
25,500
12,400
0.67
11.66
1000
58.5 / 55.9
80/67
50
95
7,300
-3,500
10,800
-0-
10.23
1000
83.0 / 65.1
Dehum
Pounds of
Water/Hour
Evaporator
Airflow
Approximate
Supply Air
Mode
A/C
vs.
Dehum
Rated CFM 1200. Shipped from the factory on optional CFM of 1000.
Q48H2D Application Performance Data
Indoor
Conditions
Outdoor
Conditions
System Capacity
DB/WB
% RH
DB
Total
Sensible
Latent
S/T
Lbs.
CFM
DB/WB
65/63
90
65
50,800
21,100
29,700
0.42
28.00
1250
49.7 / 48.9
A/C
65/63
90
65
23,200
-4,700
27,900
-0-
26.37
1250
68.6 / 57.2
Dehum
75/62.5
50
75
47,100
32,800
14,300
0.70
13.47
1250
51.2 / 49.1
A/C
75/62.5
50
75
16,300
3,000
13,300
.18
12.52
1250
72.8 / 58.3
Dehum
75/65.5
60
75
50,000
29,000
21,000
0.58
19.74
1250
54.0 / 52.2
A/C
Dehum
75/65.5
60
75
19,300
-0-
19,300
-0-
18.32
1250
75.1 / 60.8
75/68
70
75
52,300
25,600
27,700
0.49
25.11
1250
56.4 / 54.9
A/C
75/68
70
75
21,200
-2,700
23,900
-0-
22.56
1250
77.4 / 63.0
Dehum
80/67
50
95
45,000
32,600
12,400
0.70
13.29
1400
59.4 / 56.8
A/C
80/67
50
95
44,000
30,600
16,000
0.67
14.45
1250
57.7 / 55.2
80/67
50
95
6,700
-5,500
11,200
-0-
10.62
1250
83.4 / 65.5
Dehum
Pounds of
Water/Hour
Evaporator
Airflow
Approximate
Supply Air
Mode
A/C
vs.
Dehum
Rated CFM 1400. Shipped from the factory on optional CFM of 1100.
Q60H2D Application Performance Data
Indoor
Conditions
Outdoor
Conditions
System Capacity
DB/WB
% RH
DB
Total
Sensible
Latent
S/T
Lbs.
CFM
DB/WB
65/63
90
65
57,100
24,300
32,800
0.42
30.98
1250
47.9 / 47.3
A/C
65/63
90
65
37,100
6,300
30,800
0.17
29.06
1250
60.6 / 53.2
Dehum
75/62.5
50
75
51,800
34,900
16,900
0.67
15.91
1250
62.5 / 50.2
A/C
75/62.5
50
75
31,000
16,000
15,000
0.52
14.16
1250
64.3 / 54.2
Dehum
75/65.5
60
75
55,500
31,200
24,200
0.56
22.86
1250
52.8 / 51.1
A/C
Dehum
75/65.5
60
75
34,100
11,300
22,800
0.33
21.50
1250
67.0 / 57.0
75/68
70
75
59,100
28,200
30,900
0.48
29.10
1250
54.9 / 53.5
A/C
75/68
70
75
37,400
7,900
29,500
0.21
27.79
1250
69.4 / 59.5
Dehum
80/67
50
95
53,000
36,000
17,000
0.69
15.43
1550
58.7 / 56.1
A/C
80/67
50
95
52,900
34,000
18,900
0.64
17.93
1250
56.0 / 53.6
A/C
80/67
50
95
26,200
8,800
17,400
0.34
16.38
1250
73.7 / 60.8
Dehum
Rated CFM 1550. Shipped from the factory on optional CFM of 1250.
Manual7960-701
Page 4 of 5
Electrical Specifications – Dehumidification Models
MODEL
Q24H2DA0Z
A05
A10
Q24H2DB0Z
B06
B09
Q24H2DC0Z
C06
C09
Q30H2DA0Z
A05
A10
Q30H2DB0Z
B06
B09
B12
Q30H2DC0Z
C06
C09
C12
Q36H2DA0Z
A05
A10
 A15
Q36H2DB0Z
B06
B09
 B15
Q36H2DC0Z
C06
C09
 C15
Q42H2DA0Z
A05
A10
 A15
Q42H2DB0Z
B06
B09
 B15
Q42H2DC0Z
C06
C09
 C15
Q48H2DA0Z
A05
A10
 A15
Q48H2DB0Z
B06
B09
 B15
Q48H2DC0Z
C06
C09
 C15
Q60H2DA0Z
A05
A10
 A15
Q60H2DB0Z
B09
 B15
Q60H2DC0Z
C09
 C15
Rated
Volts &
Phase
230/208-1
230/208-3
460-3
230/208-1
230/208-3
460-3
230/208-1
230/208-3
460-3
230/208-1
230/208-3
460-3
230/208-1
230/208-3
460-3
230/208-1
230/208-3
460-3
No. Field
Power
Circuits

Minimum
Circuit
Ampacity
1
1
1 or 2
1
1
1
1
1
1
1
1
1 or 2
1
1
1
1
1
1
1
1
1
1
1 or 2
1 or 2
1
1
1
1
1
1
1
1
1
1
1 or 2
1 or 2
1
1
1
1
1
1
1
1
1
1 or 2
1 or 2
1 or 2
1
1
1
1
1
1
1
1
1
1 or 2
1 or 2
1 or 2
1
1
1
1
1
1
22
47
72
17
35
44
10
19
23
25
50
75
18
37
45
55
12
21
25
30
31
56
81
83
25
43
52
53
12
21
26
27
34
59
84
84
25
43
52
53
13
22
26
27
38
63
88
88
29
47
56
56
15
24
28
28
45
70
95
95
31
58
58
17
31
31
Single Circuit


Maximum
Field
External
Power
Fuse or
Wire
Ckt. Brkr.
Size
30
10
50
8
80
4
20
12
35
8
45
8
15
14
20
12
25
10
8
35
50
8
80
4
25
10
40
8
45
8
60
6
15
14
25
10
25
10
30
10
45
8
60
6
90
4
4
90
30
10
50
8
60
6
60
6
15
14
25
10
30
10
30
10
50
8
60
6
90
4
90
4
35
8
50
8
60
6
60
6
15
14
25
10
30
10
30
10
50
8
70
6
3
90
90
3
40
8
50
8
60
6
60
6
20
12
25
10
30
10
30
10
60
8
90
4
100
3
100
3
45
8
60
6
60
6
25
10
35
8
35
8

Ground
Wire
10
10
8
12
10
10
14
12
10
10
10
8
10
10
10
10
14
10
10
10
10
10
8
8
10
10
10
10
14
10
10
10
10
10
8
8
10
10
10
10
14
10
10
10
10
8
8
8
10
10
10
10
12
10
10
10
10
8
8
8
10
10
10
10
10
10
 Minimum
Circuit
Ampacity
Dual Circuit
 Maximum

External Fuse
Field Power
or Ckt. Breaker
Wire Size

Ground
Wire Size
Ckt. A
Ckt. B
Ckt. A
Ckt. B
Ckt. A
Ckt. B
Ckt. A
Ckt. B
22
50
30
50
10
8
10
10
25
50
30
50
10
8
10
10
31
33
50
50
45
45
50
50
8
8
8
8
10
10
10
10
34
34
50
50
45
45
50
50
8
8
8
8
10
10
10
10
38
38
38
25
50
50
50
50
50
25
50
50
8
8
8
10
8
8
10
10
10
10
10
10
45
45
45
25
50
50
60
60
60
25
50
50
8
8
8
10
8
8
10
10
10
10
10
10

Maximum size of the time delay fuse or HACR type circuit breaker for protection of field wiring conductors.

Based on 75°C copper wire. All wiring must conform to the National Electrical Code and all local codes.

These “Minimum Circuit Ampacity” values are to be used for sizing the field power conductors. Refer to the National Electric Code (latest revision), article 310 for power conductor sizing.
Caution: When more than one field power conductor circuit is run through one conduit, the conductors must be derated. Pay special attention to note 8 of table 310 regarding Ampacity Adjustment Factors when more than three conductors are in a raceway.

Maximum KW that can operate with heat pump on is 10KW. Other 5KW energizes during emergency heat only.

Maximum KW that can operate with heat pump on is 9KW. Other 6KW energizes during emergency heat only.
NOTE: Reference Specification Sheet S3407 for dehumidification model performance information.
Manual7960-701
Page
5 of 5
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