Table 13: static resistances, Table 14: power exhaust performance, Table 15: blower motor and drive data – Energy Tech Laboratories DHG240 User Manual
Page 18
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TABLE 13: STATIC RESISTANCES
1
DESCRIPTION
RESISTANCE, IWG
CFM
15 TON
20 TON
4500
5765
7200
6000
7000
9400
WET COIL
0.1
0.1
0.1
0.1
0.1
0.1
ECONOMIZER OPTION
0.1
0.1
0.1
0.1
0.1
0.1
HORIZONTAL DUCT CONN.
2
0.2
0.3
0.5
0.2
0.3
0.5
1
Deduct these resistance values from the available unit ESP values listed in the respective blower per-
formance table except for Horizontal Duct Connections.
2
Add these values due to less airflow resistance.
TABLE 14: POWER EXHAUST PERFORMANCE
MOTOR
SPEED
1
STATIC RESISTANCE OF RETURN DUCTWORK, IWG
0.2
0.3
0.4
0.5
0.6
CFM
kW
CFM
kW
CFM
kW
CFM
kW
CFM
kW
HIGH
2
5250
0.83
4500
0.85
4200
0.88
3750
0.93
3000
0.99
MEDIUM
4900
0.77
3900
0.79
3500
0.82
2900
0.85
-
-
LOW
4400
0.72
3700
0.74
3000
0.78
-
-
-
-
1
Power exhaust motor is a 3/4 HP, PSC type with sleeve bearings, a 48 frame and inherent protection.
2
The factory setting.
TABLE 15: BLOWER MOTOR AND DRIVE DATA
MODEL
SIZE
DRIVE
BLWR
RANGE
(RPM)
MOTOR
1
ADJ. MOTOR PULLEY
FIXED BLOWER PULLEY
BELT
(NOTCHED)
HP FRAME
EFF.
(%)
DESIGN-
NATION
O/D
(in.)
PITCH
DIA
(in.)
BORE
(in.)
DESIGN-
NATION
O/D
(in.)
PITCH
DIA
(in.)
BORE
(in.)
DESIG-
NATION
PITCH
LNGTH.
(in.)
QTY.
15 Ton
Std.
850/1065
5
184T
89.5
1VP56
5.35
4.3-
5.3
2
1-1/8
BK90
8.75
8.4
1
BX70
71.8
1
High
Spd.
Acs.
965/1190
BK80
7.75
7.4
1
BX68
69.8
1
20 Ton
Std.
870/1025
7.5
213T
91
1VP68
6.75
5.5-
6.5
2
1-3/8
BK120
11.75
11.4
1-3/16
BX83
84.8
1
High
Spd.
Acs.
950/1120
BK110
10.75
10.4
1-3/16
BX80
81.8
1
1
All motors have a nominal speed of 1800 RPM, a 1.15 service factor and a solid base. They can operate to the limit of their service
factor because they are located in the moving air, upstream of any heating device.
2
DO NOT close this pulley below 1 turn.