Static Resistances; Electric Heater Cfm Limitations - York DH 036 Technical Manual

TABLE 11: STATIC RESISTANCES
DESCRIPTION
1 3
ECONOMIZER
ELECTRIC 7-15KW
1
HEATERS
20-30KW
BOTTOM DUCT CONNECTIONS
2
COOLING ONLY
1. Deduct these resistance values from the available external static pressure shown in SUPPLY AIR BLOWER PERFORMANCE Tables.
2. Add these resistance values to the available static resistance values on SUPPLY AIR BLOWER PERFORMANCE Tables.
3. The pressure through 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.
TABLE 12: ELECTRIC HEATER CFM LIMITATIONS
UNIT MODEL SIZE NOMINAL
TONS
3
4
5
22
1000 1200 1400
0.07 0.08 0.09
0.04 0.05 0.06
0.06 0.07 0.08
1
0.06 0.07 0.08
0.08 0.10 0.12
VOLTAGE
5
208/230-1-60 1100
208/230-3-60 1100
460-3-60 -
575-3-60 -
208/230-1-60 1300
208/230-3-60 1300
460-3-60 -
575-3-60 -
208/230-1-60 1600
208/230-3-60 1600
460-3-60 -
575-3-60 -
RESISTANCE, IWG
CFM
1600 1800 2000 2200
0.11 0.13 0.15 0.17
0.07 0.08 0.10 0.12
0.09 0.11 0.13 0.15
0.09 0.10 0.11 0.12
0.14 0.16 0.18 0.20
MINIMUM SUPPLY AIR CFM
HEATER SIZE NOMINAL KW
7 10
1100 1200
1100 1200
1100 1200
- 1200
1300 1300
1300 1300
1300 1300
- 1300
1600 1600
1600 1600
1600 1600
- 1600
036-21506-003-C-0405
2400 2600 2800
0.20 0.23 0.26
0.14 0.16 0.19
0.17 0.20 0.23
0.14 0.16 0.19
0.23 0.26 0.29
15 20
1200 1300
1200 1300
1200 1300
1200 1300
1300 1300
1300 1300
1300 1300
1300 1400
1600 1600
1600 1600
1600 1600
1600 1600
Unitary Products Group
3000
0.30
0.22
0.26
0.22
0.32
30
-
-
-
-
-
-
-
-
1600
1600
1600
1800