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The setting (turns open) for the optional belt-drive supply air
motor pulley can be determined from Table 15.

OPTIONAL BELT-DRIVE BLOWER

All units with belt-drive blowers have single-speed motors. The
variable pitch pulley on the blower motor can be adjusted to
obtain the desired supply air CFM. Refer to Table 7 for blower
motor and drive data. The tension on the belts should be
adjusted as shown in Figure 7.

Start the supply air blower motor. Adjust the resistances in both
the supply and the return air duct systems to balance the air
distribution throughout the conditioned space. The job
specifications may require that this balancing be done by
someone other than the equipment installer.

To check the supply air CFM after the initial balancing has been
completed:

1. Remove the (two) 

5

16

" dot plugs from the holes located on

the filter access panel side of the unit.

2. Insert at least 8" of 1/4 inch tubing into each of these holes

for sufficient penetration into the air flow on both sides of
the evaporator coil.

NOTE: The tubes must be inserted and held in a position

perpendicular to the air flow so that velocity pres-
sure will not affect the static pressure readings.

3. Using an inclined manometer, determine the pressure drop

across a dry indoor coil. Since the moisture on an indoor
coil may vary greatly, measuring the pressure drop across
a wet coil under field conditions would be inaccurate. To
assure a dry coil, the scroll compressors should be
de-energized while the test is being run.

4. Knowing the pressure drop across a dry coil, the actual

CFM through the unit can be determined from the curve in
Figure 8.

WARNING: Failure to properly adjust the total system air quan-

tity can result in poor system performance.

5. After readings have been obtained, remove the tubes and

seal the holes with the 

5

16

" dot plugs removed in Step 1.

NOTE: DE-ENERGIZE THE SCROLL COMPRESSORS BE-

FORE TAKING ANY TEST MEASUREMENTS TO
ASSURE A DRY INDOOR COIL.

SECURE OWNER’S APPROVAL

When the system is functioning properly, secure the owner’s approval. Show him the

location of all disconnect switches and the thermostat. Teach him how to start and stop the unit and how to adjust temperature
settings within the limitations of the system.

TURNS

OPEN*

BLOWER DRIVE RANGE (RPM)

3 TON

4 TON

5 TON

6 TON

5
4
3
2
1
0

780
842
904
966

1028
1090

790
856
922
988

1054

1120

850
924
998

1072
1246
1220

900
970

1040

1110

1180

1250

*

Pulley can be adjusted in half-turn increments.

TABLE 15 - BELT-DRIVE SUPPLY AIR

MOTOR PULLEY ADJUSTMENT

SPAN LENGTH

DEFL FORCE

* NEVER LOOSEN

(A)

(C)*

(D)

CAUTION

Procedure for adjusting belt tension:

1. Loosen nut (D) from the motor mount.

2. Never loosen nuts (C) from each other while loosening nut (D).

3. Adjust the tension by turning bolt (B).

4. Do not loosen the four nuts (top and bottom) (A); unless additional tensioning

    distance is required; immediately re-tighten these bolts if loosened.

5. Use a belt tension checker to apply a perpendicular force to one belt at the

     midpoint of the span as shown. The deflection force should be applied

     until a specific deflection distance of  4mm (5/32")is obtained. To determine

     the deflection distance from normal position, use a straight edge from

     sheave to sheave as a reference line.  The recommended deflection force

     is as follows:

Tension new belts at the max. deflection force recommended for the belt

section. Check the belt tension at least two times during the first 24 hours of

operation. Any re-tensioning should fall between the min. and max.

deflection force values.

6. After adjusting, re-tighten nut (D) against the motor mount taking care not

    to loosen nuts (C).

(B)

FIG. 7 - BELT ADJUSTMENT

FIG. 8 - PRESSURE DROP ACROSS A DRY

EVAPORATOR COIL VS SUPPLY AIR CFM,
WITHOUT AIR FILTERS

0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

750

1250

1750

2250

2750

3250

3750

036

048

072

NOMINAL CFM

PRE

S

S

URE DROP

 (

IWG)

060

530.18-N7Y

Unitary Products Group

15

Summary of Contents for D2CE 072

Page 1: ...s equipment All forms referenced in this instruction may be ordered from Publications Distribution Center Unitary Products Group P O Box 1592 York PA 17405 APPROVALS Design certified by U L and C G A as follows 1 For use as a cooling only unit or cooling unit with electric heat 2 For outdoor installation only 3 For installation on combustible material SUNLINE 2000 ELECTRIC ELECTRIC SINGLE PACKAGE ...

Page 2: ...erf 5 6 Ton Belt Drive 10 6 Static Resistances 11 7 Motor and Drive Data Belt Drive 11 8 Electrical Data Direct Drive 11 9 Electrical Data Belt Drive 11 10 Supperheat 036 12 11 Supperheat 048 12 12 Supperheat 060 12 13 Supperheat 072 13 14 Heat Anticipator Setting 14 15 Motor Pulley Adjustment 15 FIGURES No Description Page 1 Center of Gravity 3 2 Recommended Drain Piping 4 3 Economizer Rain Hood ...

Page 3: ...ed with a forklift Slotted openings in the base rails are provided for this purpose LENGTH OF FORKS MUST BE A MINIMUM OF 42 Remove the nesting brackets from the four corners on top of the unit All screws that are removed when taking these brackets off must be replaced on the unit Refer to Table 2 for unit weights and to Figure 1 for approximate center of gravity CLEARANCES All units require certai...

Page 4: ...e wiring diagram Electrical lines must be sized properly to carry the load USE COPPER CONDUCTORS ONLY Each unit must be wired with a separate branch circuit fed directly from the meter panel and properly protected CAUTION When connecting electrical power and control wiring to the unit waterproof type connectors MUST BE USED so that water or moisture can not be drawn into the unit during normal ope...

Page 5: ...n hood flange and tighten Attach the two side plates to the unit panel by using two self drilling screws for each side plate at dimples D provided in the panel 6 Position fillpiece at bottom of hood between the two side plates but do not secure at this time Slotted openings MUST be downward for drainage After fillpiece is properly positioned note where contact is made with the unit panel Remove fi...

Page 6: ... UNIT HAS AN ECONOMIZER REMOVE JUMPER J1 FROM TERMINALS 8 AND 10 ON THE RELAY BOARD TO PREVENT SIMULTANEOUS OPERATION OF THE SCROLL COMPRESSOR AND THE ECONOMIZER IF YOU WANT TO CONTROL THE ECONOMIZER ON A SECOND STAGE OF COOLING OR HAVE AN ELECTRIC HEAT ACCESSORY WITH TWO STAGES OF HEAT USE THERMOSTAT 2TH04701024 OR 2TH04701524 WITH SUBBASE 2TB04700224 OR 2TB04700324 COOLING HEATING 24 VOLT THERMO...

Page 7: ...proper size of the supply and return air duct connections SCROLL COMPRESSOR ACCESS 111 2 45 8 3 77 8 61 2 171 2 111 2 171 2 REAR VIEW SIDE SUPPLY AND RETURN AIR OPENINGS UNIT BASE WITH RAILS FRONT VIEW All dimensions are in inches They are sub ject to change without notice Certified di mensions will be provided upon request UNIT WITH ECONOMIZER RAIN HOOD 447 8 B 307 8 A 101 4 43 8 A 31 2 81 4 191 ...

Page 8: ...ED LOW 1684 1487 800 710 1631 1464 780 690 1699 1582 1421 825 750 670 1650 1524 1367 785 720 650 1570 1410 1315 755 690 620 1430 1324 1246 725 650 605 1360 1260 1185 700 630 590 1280 1185 1110 680 610 570 1180 1100 1020 655 590 545 048 HI MED LOW 1996 1804 1681 960 838 760 1933 1765 1640 936 810 738 1868 1714 1604 910 785 715 1795 1650 1541 880 765 695 1722 1589 1490 845 735 670 1635 1508 1416 820...

Page 9: ...TATIC RESISTANCES TABLE FOR RESISTANCE VALUES ON APPLICATIONS OTHER THAN GAS ELECTRIC UNITS WITH SIDE DUCT AIRFLOWS UNIT SIZE AIR FLOW CFM Available External Static Pressure IWG 0 20 0 30 0 40 0 50 0 60 0 70 0 80 RPM Watts RPM Watts RPM Watts RPM Watts RPM Watts RPM Watts RPM Watts 036 2000 843 860 880 925 919 1005 956 1065 993 1145 1030 1195 1067 1235 1900 817 775 854 850 893 920 930 995 970 1065...

Page 10: ...ure IWG 0 20 0 30 0 40 0 50 0 60 0 70 0 80 RPM Watts RPM Watts RPM Watts RPM Watts RPM Watts RPM Watts RPM Watts 060 2500 1059 1560 1077 1590 1095 1630 1114 1650 1134 1660 1158 1685 1181 1720 2400 1032 1405 1054 1470 1074 1525 1094 1560 1116 1595 1140 1620 1167 1640 2300 1005 1260 1024 1275 1049 1370 1069 1440 1090 1475 1116 1505 1142 1535 2200 980 1160 1002 1170 1022 1190 1044 1250 1066 1350 1090...

Page 11: ...PS MIN MAX RLA LRA 036 208 230 1 60 208 230 3 60 460 3 60 575 3 60 187 187 414 518 253 253 504 630 18 0 11 4 6 2 5 0 105 0 90 0 45 0 36 0 1 3 1 3 0 8 0 8 4 4 4 4 2 2 2 2 28 2 20 0 10 8 9 3 45 30 15 15 45 30 15 048 208 230 1 60 208 230 3 60 460 3 60 575 3 60 187 187 414 518 253 253 504 630 24 4 14 1 7 1 5 6 140 0 105 0 55 0 44 0 1 3 1 3 0 8 0 8 5 0 5 0 2 2 2 2 36 8 23 9 11 9 10 1 60 35 15 15 60 35 ...

Page 12: ...15 2 17 4 19 5 21 6 23 7 25 6 27 5 29 5 31 4 80 7 5 9 6 11 7 13 9 16 0 18 2 20 3 22 6 24 8 27 1 29 3 85 6 1 8 3 10 4 12 6 14 8 16 9 19 5 22 1 24 7 27 3 90 6 6 8 2 9 8 11 4 13 0 16 1 19 1 22 2 25 2 95 5 9 7 0 8 0 9 1 12 6 16 1 19 6 23 1 100 5 3 6 2 7 0 7 9 11 1 14 2 17 4 20 5 105 5 4 6 0 6 7 9 5 12 3 15 2 18 0 110 5 0 5 5 8 0 10 5 13 0 15 4 115 6 4 8 6 10 7 12 9 TABLE 11 SUPERHEAT CHARGING TABLE FO...

Page 13: ...0 24 1 27 2 28 7 30 2 31 7 33 2 80 5 2 8 5 11 7 15 0 18 2 21 4 24 7 26 3 27 9 29 6 31 2 85 5 3 8 7 12 0 15 4 18 8 22 2 23 9 25 7 27 4 29 2 90 5 1 7 7 10 4 13 0 15 7 18 4 20 7 23 1 25 4 27 8 95 6 8 8 7 10 6 12 6 14 5 17 5 20 4 23 4 26 3 100 6 2 7 7 9 2 10 7 12 3 15 4 18 5 21 7 24 8 105 5 6 6 7 7 8 8 9 10 0 13 4 16 7 20 0 23 3 110 5 6 6 4 7 1 7 8 11 3 14 8 18 3 21 8 115 5 2 5 5 9 2 12 9 16 6 20 4 TA...

Page 14: ... for heating by the thermostat b Upon a call for heat by the thermostat the first stage of heat will be energized Sequencer 1S or contactor 2M is always the first and last to complete its timing cycle and controls power to the evaporator blower motor c The thermostat will cycle the electric heat to satisfy the heating requirements of the conditioned space Two Stage Heating a If the fan switch is i...

Page 15: ... removed in Step 1 NOTE DE ENERGIZE THE SCROLL COMPRESSORS BE FORE TAKING ANY TEST MEASUREMENTS TO ASSURE A DRY INDOOR COIL SECURE OWNER S APPROVAL When the system is functioning properly secure the owner s approval Show him the location of all disconnect switches and the thermostat Teach him how to start and stop the unit and how to adjust temperature settings within the limitations of the system...

Page 16: ... air circuit Cleaning should be as often as necessary to keep coil clean Use a brush vacuum cleaner attachment or other suitable means If water is used to clean coil be sure power to the unit is shut off prior to cleaning NOTE Exercise care when cleaning the coil so that the coil fins are not damaged Do not permit the outdoor air discharge to be obstructed by overhanging structures of shrubs Unita...

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