Magic-Pak MGE4 Series - Ductwork Design and Connections; Ductwork Sizing and Sealing

507858-01 Issue 1922 Page 7 of 21
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 exible joints. If exible 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.
CAUTION
Figure 5. Securing Unit
Installation
Brackets
Remove and replace screw to secure bracket
(one each side)
Model
Gas Heating
Indoor
Blower
Speed
0.1 “w.c. 0.2 “w.c. 0.3 “w.c. 0.4 “w.c. 0.5 “w.c.
Rise
Range
(F°)
Mid
Rise
(F°)
SCFM Watts Temp Rise SCFM Watts Temp Rise SCFM Watts Temp Rise SCFM Watts Temp Rise SCFM Watts Temp Rise
3/4 Ton
15MGE4-11-091*P
15 - 45 30
TAP 1
(FAN)
430 46 --- 370 50 --- 320 53 --- 265 57 --- 200 62 ---
TAP 2
(COOL)†
375 39 --- 315 42 --- N/A N/A --- N/A N/A --- N/A N/A ---
TAP 3
(COOL)
N/A N/A --- N/A N/A --- 440 83 --- 390 87 --- 340 92 ---
TAP 4
(HEAT)*
365 35 31 300 39 37 240 42 47 N/A N/A N/A N/A N/A N/A
TAP 5
(HEAT)
N/A N/A N/A N/A N/A N/A 460 83 24 415 88 27 370 98 30
24MGE4-11-091*P
25 - 55 40
TAP 1
(FAN)
430 46 --- 370 50 --- 320 53 --- 265 57 --- 200 62 ---
TAP 2
(COOL)†
375 39 --- 315 42 --- N/A N/A --- N/A N/A --- N/A N/A ---
TAP 3
(COOL)
N/A N/A --- N/A N/A --- 440 83 --- 390 87 --- 340 92 ---
TAP 4
(HEAT)*
445 48 40 390 53 46 340 56 53 N/A N/A N/A N/A N/A N/A
TAP 5
(HEAT)
N/A N/A N/A N/A N/A N/A 530 102 34 480 108 37 440 114 41
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 eld adjusted to speed Tap 3 for higher duct static applications.
* As shipped speed for Heating operation. Blower speed must be eld adjusted to Speed Tap 5 for higher duct static applications.
Table 4. Blower Performance (208V or 230V)