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DUAL COMPRESSOR PACKAGED HEAT PUMP INSTALLATION GUIDE
General Installation Information
Check that cabling will not be subject to wear, corrosion, excessive
pressure, vibration, sharp edges or any other adverse environmental
effects. The check shall also take into account the effects of aging or
continual vibration from sources such as compressors or fans.
Determination of Minimum Floor Area
Determine the total refrigerant charge in the system. In
packaged heat pump systems, the factory charge should be
the total charge for the system and there should be no reason
for adding charge in the fi eld. The equipment serial plate
and unit physical data table should serve as reference for the
total charge. Heat pumps with a refrigerant charge of 62 oz
or greater come with a refrigerant mitigation system factory
installed.
The heat pump equipment is ducted and utilizes the blower
for leak mitigation. Once the refrigerant leak sensor detects
leaked refrigerant, the compressor and electric heat will be
deactivated, and the blower will operate in the continuous
fan setting. This will occur for a minimum of 5 minutes and
an alarm in the control will remain until the sensor no longer
detects a leak.
The minimum area where the unit can be installed, Amin, is
based on the refrigerant charge and installation height of the
unit, shown in the table below. Since this heat pump is ducted
and is utilizing the blower for leak mitigation, the ducted/
zoned fl oor area must be greater than the TA
table below. If the heat pump is zoned, the dampers must
open to allow the heat pump blower to mitigate the refriger-
ant leak. The continuous blower speed must be set higher
than Q
, shown in the table below. The continuous fan set-
min
ting is factory set to exceed the minimum airfl ow required for
mitigation.
Model
Confi guration
Vertical
Horizontal Floor
072
Horizontal Floor +2 Ft
Horizontal Floor +4 ft
Horizontal Suspended
WARNING
shown in the
min
H
0
in
ft
m
54.4
4.5
1.4
23.6
2.0
0.6
47.6
4.0
1.2
71.6
6.0
1.8
86.6
7.2
2.2
meter
0
200
400
600
800
1000
1200
1400
1600
1800
2000
2200
2400
2600
2800
3000
3200
When the location of the installation is above 1969 ft (600m),
the Altitude Adjustment Factor in the table is needed to cal-
culate the minimum room size".
Example: For instance, if you are installing a 072 vertical unit.
If your elevation is 5249 ft (1600m) your area factor would be
1.12. If your charge weight is 76oz (2.154kg) at a fl oor height
installation. The A
min
meters). Take 113.4 square Ft X 1.12 for a new Amin of 127.0
square feet (11.9 square meters).
Charge
A
min
lbm
oz
ft2
6.5
76
113.4
6.5
73
429.8
6.5
73
124.4
6.5
73
82.7
6.5
73
68.4
4
H
alt
AF
ft
0
1.00
656
1.00
1312
1.00
1968
1.00
2624
1.02
3280
1.05
3937
1.07
4593
1.10
5249
1.12
5905
1.15
6561
1.18
7217
1.21
7874
1.25
8530
1.28
9186
1.32
9842
1.36
Not recommended
would be 127.0 square Ft or (11.9 square
Q
min
m2
cfm
m3/h
ft2
10.5
128.5
218.4
71.2
39.9
123.4
209.7
68.4
11.6
123.4
209.7
68.4
7.7
123.4
209.7
68.4
6.4
123.4
209.7
68.4
TA
min
m2
6.6
6.4
6.4
6.4
6.4
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