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036-21564-002-A-0404
10 Unitary Products Group
HEATER / CFM LIMITATIONS
HEATER
SIZE
NOM. KW
VOLTAGE
1
UNIT MODEL SIZE, NOMINAL TONS
345
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
345
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 CGAapproved.
2
CGAminimum is 1,400 CFM.
REFER TO ELECTRICALDATA
TABLES TO SIZE THE
DISCONNECT SWITCH, THE
WIRING AND OVERCURRENT
PROTECTION
REFER TO ELECTRICALDATA
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