036-21564-002-A-0404
10
Unitary Products Group
HEATER / CFM LIMITATIONS
HEATER
SIZE
NOM. KW
VOLTAGE
1
UNIT MODEL SIZE, NOMINAL TONS
3
4
5
MINIMUM SUPPLY AIR CFM
5
7
10
15
20
30
208 /
230-1-60
1,100
1,100
1,200
1,200
1,300
2
-
1,300
1,300
1,300
1,300
1,300
2
-
1,600
1,600
1,600
1,600
1,600
1,600
5
7
10
15
20
30
208 /
230-3-60
1,100
1,100
1,200
1,200
1,300
2
-
1,300
1,300
1,300
1,300
1,300
2
-
1,600
1,600
1,600
1,600
1,600
1,600
HEATER
SIZE
NOM. KW
VOLTAGE
1
UNIT MODEL SIZE, NOMINAL TONS
3
4
5
MINIMUM SUPPLY AIR CFM
7
10
15
20
30
460-3-60
1,100
1,200
1,200
1,300
-
1,300
1,300
1,300
1,300
-
1,600
1,600
1,600
1,600
1,600
10
15
20
30
575-3-60
1,200
1,200
1,300
-
1,300
1,300
1.400
-
1,600
1,600
1,600
1,800
1
208/230 and 460 volt heaters are UL approved.
208/230 and 575 volt heaters are CGA approved.
2
CGA minimum is 1,400 CFM.
REFER TO ELECTRICAL DATA
TABLES TO SIZE THE
DISCONNECT SWITCH, THE
WIRING AND OVERCURRENT
PROTECTION
REFER TO ELECTRICAL DATA
TABLES TO SIZE THE
DISCONNECT SWITCH, THE
WIRING AND OVERCURRENT
PROTECTION
2
3
4
TO REMOTE SENSOR
2TH04702224 IF USED
2
1
24-volt thermostat with subbase:
—2TH11700224 for manual changeover.
—2TH11704124 for automatic changeover.
2
Only required on units with supplemental electric heat.
FIELD WIRING
CONTROL WIRING
EXTERNAL STATIC PRESSURE DROP
DESCRIPTION
RESISTANCE, IWG
CFM
1000
1200
1400
1600
1800
2000
2200
2400
2600
Economizer
1, 2
0.07
0.08
0.09
0.11
0.13
0.15
0.17
0.20
0.23
Electric Heaters
1
5 - 15 KW
0.04
0.05
0.06
0.07
0.08
0.10
0.12
0.14
0.16
20 - 30 KW
0.06
0.07
0.08
0.09
0.11
0.13
0.15
0.17
0.20
Bottom Duct Connections
1
0.06
0.07
0.08
0.09
0.10
0.11
0.12
0.14
0.16
1
Deduct these resistance values from the available external static pressure shown in the respective Blower Performance Table.
2
The pressure thru the economizer is greater for 100% outdoor air than for 100% return air. If the resistance of the return air duct system is less than 0.25 IWG, the unit will deliver less CFM
during full economizer operation.
STATIC RESISTANCES
POWER WIRING
