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Ductwork
Ductwork should be designed and sized according to the
methods in Manual Q of the Air Conditioning Contractors
of America (ACCA).
Check unit air supply outlet for debris before making
ductwork connections.
It is recommended that supply and return duct connections
at the unit be made with flexible joints. If flexible ducts are
used, a 6" sheet metal starter collar is required.
The supply and return air duct systems should be designed
for the CFM and static requirements of the job (see Table
4). They should not be sized to match the dimensions
of the duct connections on the unit. The return duct
should be sealed to the unit casing and terminate outside
the space containing the unit.
Do not screw into the indoor coil.
Gas Heating
Rise
Mid
Range
Rise
(F°)
(F°)
15 - 45
30
25 - 55
40
N/A: Do not operate unit using this blower speed at this external static pressure.
† As shipped speed for Cooling operation. Blower speed must be field adjusted to speed Tap 3 for higher duct static applications.
* As shipped speed for Heating operation. Blower speed must be field adjusted to Speed Tap 5 for higher duct static applications.
507858-01
CAUTION
0.1 "w.c.
Indoor
Blower
Speed
TAP 1
430
46
---
(FAN)
TAP 2
375
39
---
(COOL)†
TAP 3
N/A
N/A
---
(COOL)
TAP 4
365
35
31
(HEAT)*
TAP 5
N/A
N/A
N/A
(HEAT)
TAP 1
430
46
---
(FAN)
TAP 2
375
39
---
(COOL)†
TAP 3
N/A
N/A
---
(COOL)
TAP 4
445
48
40
(HEAT)*
TAP 5
N/A
N/A
N/A
(HEAT)
Table 4. Blower Performance (208V or 230V)
Installation
Brackets
0.2 "w.c.
0.3 "w.c.
370
50
---
320
53
315
42
---
N/A
N/A
N/A
N/A
---
440
83
300
39
37
240
42
N/A
N/A
N/A
460
83
370
50
---
320
53
315
42
---
N/A
N/A
N/A
N/A
---
440
83
390
53
46
340
56
N/A
N/A
N/A
530
102
Issue 1922
Remove and replace screw to secure bracket
(one each side)
Figure 5. Securing Unit
0.4 "w.c.
---
265
57
---
---
N/A
N/A
---
---
390
87
---
47
N/A
N/A
N/A
24
415
88
27
---
265
57
---
---
N/A
N/A
---
---
390
87
---
53
N/A
N/A
N/A
34
480
108
37
0.5 "w.c.
200
62
---
N/A
N/A
---
340
92
---
N/A
N/A
N/A
370
98
30
200
62
---
N/A
N/A
---
340
92
---
N/A
N/A
N/A
440
114
41
Page 7 of 21
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