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

TABLE 21: STATIC RESISTANCES
DESCRIPTION
1,3
ECONOMIZER
7-15KW
ELECTRIC
1
HEATERS
20-30KW
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 22: ELECTRIC HEATER CFM LIMITATIONS
UNIT MODEL SIZE
NOMINAL TONS
3
4
5
18
1000 1200 1400 1600
0.07 0.08 0.09 0.11
0.04 0.05 0.06 0.07
0.06 0.07 0.08 0.09
0.08 0.10 0.12 0.14
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 1600
575-3-60 -
RESISTANCE, IWG
CFM
1800 2000 2200 2400
0.13 0.15 0.17 0.20
0.08 0.10 0.12 0.14
0.11 0.13 0.15 0.17
0.16 0.18 0.20 0.23
MINIMUM SUPPLY AIR CFM
HEATER SIZE NOMINAL KW
7 10 15
1100 1200 1200
1100 1200 1200
1100 1200 1200
- 1200 1200
1300 1300 1300
1300 1300 1300
1300 1300 1300
- 1300 1300
1600 1600 1600
1600 1600 1600
1600 1600 1600
1600 1600 1600
343615-YTG-A-0807
2600 2800 3000
0.23 0.26 0.30
0.16 0.19 0.22
0.20 0.23 0.26
0.26 0.29 0.32
20 30
1300 -
1300 -
1300 -
1300 -
1300 -
1300 -
1300 -
1400 -
1600 1600
1600 1600
1600 1600
1600 1800
Unitary Products Group