507861-01
Issue 1927
Page 7 of 17
Airflow Performance as a Function of External Static Pressure
Model
Indoor Blower Speed
0.1 “w.c.
0.2 “w.c.
0.3 “w.c.
0.4 “w.c.
0.5 “w.c.
SCFM
Watts
SCFM
Watts
SCFM
Watts
SCFM
Watts
SCFM
Watts
*MHP4-1
1-301*P
TAP 1 (FAN)
590
43
535
48
430
55
380
60
315
65
TAP 2 (COOL/HP)
†
1040
161
1005
169
970
177
935
185
900
193
TAP 3 (COOL/HP)
1135
201
1105
211
1070
220
1040
229
1010
237
5 kW
TAP 4 (AUX HEAT)*
1075
151
1040
159
1005
168
N/A
N/A
N/A
N/A
TAP 5 (AUX HEAT)
1165
181
1135
193
1100
205
1065
216
1025
225
7 kW
TAP 4 (AUX HEAT)*
1075
151
1040
159
1005
168
N/A
N/A
N/A
N/A
TAP 5 (AUX HEAT)
1165
181
1135
193
1100
205
1065
216
1025
225
10 kW
TAP 4 (AUX HEAT)*
1075
151
1040
159
1005
168
N/A
N/A
N/A
N/A
TAP 5 (AUX HEAT)
1165
181
1135
193
1100
205
1065
216
1025
225
*MHP4-1
1-361*P
TAP 1 (FAN)
680
61
630
68
575
74
525
79
460
86
TAP 2 (COOL/HP)
†
1235
260
1200
272
1165
284
1135
295
1100
305
TAP 3 (COOL/HP)
1315
304
1280
316
1250
330
1215
342
1180
354
5 kW
TAP 4 (AUX HEAT)*
1240
232
1205
248
1170
262
N/A
N/A
N/A
N/A
TAP 5 (AUX HEAT)
1340
283
1290
300
1260
315
1230
328
1200
338
7 kW
TAP 4 (AUX HEAT)*
1240
232
1205
248
1170
262
N/A
N/A
N/A
N/A
TAP 5 (AUX HEAT)
1340
283
1290
300
1260
315
1230
328
1200
338
10 kW
TAP 4 (AUX HEAT)*
1240
232
1205
248
1170
262
N/A
N/A
N/A
N/A
TAP 5 (AUX HEAT)
1340
283
1290
300
1260
315
1230
328
1200
338
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.
Table 3. Blower Performance (208V or 230V)
Air Filter
All indoor return air must be filtered. A washable filter is
furnished with the unit, located in the return air compartment.
If the optional front return opening is used and a duct is
installed, provisions must be made to accommodate filter
servicing. If a filter is installed at a separate central return
location, then the factory furnished filter must be removed
from the unit.
The filter should be cleaned at least three times during
each of the heating and cooling seasons, or more
frequently if unusual conditions are encountered. To clean
the washable filter, shake filter to remove excess dirt and/
or use a vacuum cleaner. Wash filter in soap or detergent
water and replace after filter is dry. It is not necessary to oil
the filter after washing.
The washable filter may be replaced with a disposable
filter. Table 4 lists filter sizes that fit the unit.
If an installation is made in which it is more desirable to
mount the filter exterior to the unit, in the return duct work
or elsewhere, the washable filter can be used or replaced
with a disposable filter. If a disposable filter is used, use the
information provided in Table 5 when sizing the disposable
filter.
Model Number
Filter Size
(in.)
*MHP4-11-09*
*MHP4-11-12*
18 x 20 x 1
*MHP4-11-18*
20 x 20 x 1
*MHP4-11-24*
*MHP4-11-30*
22 x 24 x 1
*MHP4-11-36*
22 x 28 x 1
Table 4. Filter Sizes