Phasing; Static Resistances - York DM036 Installation Manual

5011492-XIM-B-0815
Table 21: Belt Drive Motor And Drive Data
BLOWER
MODEL
RANGE (RPM)
HP RPM
5 TON 812-1102 1.5 1450
6 TON 948-1227 1.5 1450
1. All motors have solid bases and are inherently protected. These motors can be selected to operate into their service factor because they
are located in the moving air, upstream of any heating device.
Table 22: Static Resistances
DESCRIPTION
1,2
ECONOMIZER
7-15KW
1
ELECTRIC HEATERS
20-30KW
BOTTOM DUCT CONNECTIONS
3
COOLING ONLY
DESCRIPTION
1,2
ECONOMIZER
7-15KW
1
ELECTRIC HEATERS
20-30KW
BOTTOM DUCT CONNECTIONS
3
COOLING ONLY
1. Deduct these resistance values from the available external static pressure shown in SUPPLY AIR BLOWER PERFORMANCE Tables.
2. 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 62.0 Pa [0.25 IWG], the unit will deliver less M3/S or CFM during full economizer operation.
3. Add these resistance values to the available static resistance values on SUPPLY AIR BLOWER PERFORMANCE Tables.

Phasing

YORK MODEL DM units are properly phased at the factory.
Check for proper compressor rotation. If the blower or
compressors rotate in the wrong direction at start-up, the
electrical connection to the unit is misphased. Change the
incoming line connection phasing to obtain proper rotation.
(Scroll compressors operate in only one direction. If the scroll is
drawing low amperage, has similar suction and discharge
pressures, or producing a high noise level, the scroll is
misphased).
34
1
MOTOR ADJUSTABLE MOTOR PULLY
FRAME SERVICE DESIG-
SIZE FACTOR NATION
56 1.0 IVL44
56 1.0 IVM50
0.47 0.57 0.66
17.4 19.8 22.3
10.0 12.4 14.9
14.9 17.4 19.8
1
14.9 17.4 19.8
19.8 25.0 29.8
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
PITCH DIA. BORE
mm inch mm inch
69-97 2.8-3.8 22 7/8
86-112 3.4-4.4 22 7/8
RESISTANCE, Pa
3
M
0.75 0.85 0.94
27.3 32.2 37.2
17.4 19.8 24.8
22.3 27.3 32.2
22.3 24.8 27.3
34.7 39.7 44.6
RESISTANCE, IWG
CFM
1600 1800 2000
0.11 0.13 0.15
0.07 0.08 0.10
0.09 0.11 0.13
0.09 0.10 0.11
0.14 0.16 0.18
Scroll compressors require proper rotation to operate
correctly. Units are properly phased at the factory. Do
not change the internal wiring to make the blower,
condenser fans, or compressor rotate correctly.
FIXED BLOWER PULLY
PITCH DIA. BORE
mm inch mm inch
127 5.0 25 1
132 5.2 25 1
/S
1.03 1.13 1.23
42.2 49.6 57.0
29.8 34.7 39.7
37.2 42.2 49.6
29.8 34.7 39.7
49.6 57.0 64.5
2200 2400 2600
0.17 0.20 0.23
0.12 0.14 0.16
0.15 0.17 0.20
0.12 0.14 0.16
0.20 0.23 0.26
Johnson Controls Unitary Products
BELT
PITCH
DESIG-
LENGTH
NATION
mm inch
922 36.3 A35
947 37.3 A36
1.32 1.42
64.5 74.4
47.1 54.6
57.0 64.5
47.1 54.6
71.9 79.4
2800 3000
0.26 0.30
0.19 0.22
0.23 0.26
0.19 0.22
0.29 0.32