McQuay RHP Installation Manual

BULLETIN NO. IM 150-4

INSTALLATION AND

MAINTENANCE DATA

FORM NO. 308972Y REV. A

MODELS RHP & RHQ

FEBRUARY, 1981

AIR COOLED CONDENSING UNIT

3/4,

1/2,

2,,

1/22

and

INSPECTION

When the equipment is received,

all items should be carefully checked against the bill of lading to be sure all crates and cartons have been received. when received.

carrier immediately and a claim should be filed.

All units should be carefully inspected for damage

If any damage is found,

it should be reported to the

The unit nameplate

should be checked to make sure that the voltage agrees with the power supply available.

RIGGING

Remove nuts from bolts that hold unit to skid. from skid.

protect the cabinet.

steel pipe,

points.

Rig unit as shown in Figure 1.

On 007 through 020 units, use two lengths of

inserted through holes in the unit base, as lifting

See Table 1 for unit weights.

This will free unit

Use a spreader bar to

FIGURE 1

UNIT RIGGING

Page 3

INSTALLATION

General Commercial equipment of this type is intended for installation by qualified refrigeration mechanics.

As a condition of the warranty,

the check tests and startup procedure must be performed by qualified personnel and must be properly reported on the form provided with

each unit.

Arrangements for service should be made prior to in-

stallation as it is not included in the warranty or the selling

price. Unit Location

Units are designed for outdoor application and may be mounted on a roof or concrete slab (ground level installation).

Roof mounted

units should be installed level on steel channels or an I-beam frame

to support the unit above the roof. lators is recommended. the weight of the unit.

The roof must be strong enough to support

See Table 1 for unit weights.

Use of vibration pads or iso-

Concrete

slabs used for unit mounting should be installed level and be prop-

erly supported to prevent settling.

A one piece concrete slab with

footings extended below the frost line is recommended.

The condenser coil side of the unit should be located no closer than

four feet from any wall or other obstruction to provide sufficient

clearance for air entrance. be provided on the discharge side of the unit. work to the coil inlet or fan outlet.

At least four feet of clearance should

Do not attach duct-

Care should be taken to avoid

air recirculation conditions that can be caused by sight screening, walls, etc.

Also keep unit fan discharge away from any building air

intakes.

TABLE 1

l 1

l/8

050B-H

PHYSICAL DATA

CONNECTIONS

SHIPPING

Page

Sound and Vibration Units should be installed away from occupied spaces and above or outside of utility areas, transmission of sound and vibration to occupied spaces.

corridors and auxiliary spaces to reduce the

The refrig-

erant piping should be flexible enough to prevent the transmission

of noise and vibration from the unit into the building.

If the re-

frigerant lines are to be suspended from the structure of the building, isolation hangers should be used to prevent the transmission of

vibration.

Where piping passes through a wall, it is advisable to pack fiberglass and sealing compound around the lines to minimize vibration and retain flexibility in the lines.

FIELD WIRING

Make the on the unit, codes and ordinances. ation must not exceed

supply

All wiring must be done in accordance with applicable

power connection to the fused safety switch supplied

Size conductors using Table

+lO%

of the nameplate value.

on three-phase units must not exceed 2%.

TABLE 2

TOTAL

23Ol

10.9

10.6 1 1.2

23.4

20.0

26.6

UNIT

MPS

5.1

5.9

6.7

6.5

7.8

1 I

_ _

23.3

208-

!30/3P(

-___

17.2

15.9

14.9

23.4

23.2

21 .6

35.1

34.1

35.3

57.1

58.0

46.0

RHP/RHQ

:ONDENSINC

UNIT SIZE

007&M

OlOB-L

0100-M

015B-L

015B-M

OZOB-L OZOB-M 02OB-H

030B-L 030B-M 030B-H

050B-L 050B-M 05OB-H

075B-L

075B-M

075B-H

1 OOB-L

1008&l

1 OOB-H

NOTE:

1. Based on condenser fan motor FLA at 208 volts.

2. Based on 125% of compressor RATED LOAD AMPS plus 100% of FLA for all other motors. Select conductors based on NEC 310-16 or

3. Use only time delay dual element fuses.

4. Based on maximum allowable unit cooler motor amps as shown in table 9.

2081

7.8 7.7

9.0 7.4

8.9 7.6

9.1 6.5

9.0 6.8

12.4

13.1 _

_ 22.9

_ 29.1

_ 35.2 _ _

- -

_ _

_ _ _ _

310-18.

ELECTRICAL RATINGS

MINIMUM CIRCUIT AMPS MINIMUM CIRCUIT AMPS

FOR UNITS WITHOUT

5.7

6.7

7.9

7.7

9.3

(2) ADE

4601

_ 16.6 _ 16.4 _ 16.8 _ 16.7

_ 27.6

_ _ _

- _

_ _

22.6

19.4

35.1

35.6

27.9

] - 1 -

13.5

28.2

T CIRCUIT

208- I

230/38(l)

20.4

18.8

17.5

28.2

27.9

25.9 41

40.4 41

69.2

70.3

55.3

FOR UNITS WITH

ROST

2081

YTZ-

16.3

27.8

_ _

CIRCUI

Voltage vari-

Phase unbalance

MAXIMUM

2301

FUSE

SI2

;

(41

T( T

4601

ZOO81

1P lP

15 15

15 15 25 20 25 20

_ 20

_ 45

_ 50

_ 60

_ _

37.6 _

37.6

32.9

50.1

_ _

50.6

- -

42.9

15 _ 15

15 15

15 _ 15

30 25 25 45

45 _ 40 _

60 35 60 35

60 30 100 50 100 60

90 45

Page 5

The unit is designed to operate with a pumpdown cycle, therefore a

solenoid valve must be installed in the liquid line (see Figure 2). Make sure that the system is wired so that the pumpdown cycle is initiated if power to the unit cooler fan motors is disconnected. Diagrams 1and 2 show typical control wiring for air and electric defrost applications respectively.

SEAsommm

Diagram 15 shows field wiring of the Seasonmiser system.

must have a pump down solenoid valve in the liquid line.

FIELD

WIRING (RHQ

ONLY)

All units The primary

of the Class II transformer is connected in parallel with the pump down solenoid valve. in series with the sensor and heat motor assembly.

pressure control is required,

The transformer secondary (24 VAC) is connected

If a differential

it is connected in parallel with the

subcooling sensor.

DIAGRAM I

DIAGRAM 2

PIPING

Install piping according to standard accepted refrigeration practice.

See Figure 2 for typical refrigerant piping. The following recom-

mendations should be adhered to.

See Tables 3,4 and 5 for recommended liquid and suction line

1. sizing.

Use only refrigeration grade copper tubing.

Soft solder joints are not acceptable. Pass dry nitrogen through lines while brazing.

4. Do not leave dehydrated piping or components open to the atmos-

5. phere any longer than is absolutely necessary. Use a P-trap at the base of suction risers greater than 3

to 4ft.in

height to improve oil return.

Page 6

_ .

10.

Slope suction line

l/2"

per 10 ft.

in direction of flow to improve

oil return. Support piping with hangers to prevent transmission of vibration to the building. If not furnished with condensing unit, install a filter-drier

and a sight glass in the liquid line. A solenoid valve must be installed in the liquid line because the condensing unit is designed to operate with a pump down cycle.

FIGURE

1 2 3 4 Thermostatic Expansion Valve 5 Liquid Line 6 Suction Line, Pitched Toward Compressor 7 NOTE: FILTER-DRIER AND SIGHT GLASS MAY BE

LEGEND

Filter-Drier Solenoid Valve Sight-Glass/Moisture indicator

Drain Line, Heat Trace for Low Temperature

FURNISHED WITH CONDENSING UNIT.

TYPICAL REFRIGERANT PIPING

SEASONMISER PIPING

(RHQ

ONLY)

To maximize the energy-saving potential of the Seasonmiser system, keep tubing runs as short as possible and insulate the liquid line

all the way to the cold zone. desired to prevent sweating. prevent suction gas at the compressor from rising above

The suction line may be insulated if

In any case,

care must be taken to

65OF

under

any condition. Locate the subcooling sensor (and differential pressure switch where

required) at the point where the liquid line enters the refrigerated space.

The location should be outside of the refrigerated space.

The subcooling sensor should be within 12" of the entry point.

Pump down solenoid valves and heat exchangers (where used) should be downstream of the subcooling sensor.

with the evaporator shortens sensor life.

Making the sensor pump down

Heat exchangers upstream

of the sensor can allow the formation of flash gas upstream of the

heat exchanger. The subcooling sensor is assembled with low melting point solder.

It should be installed using flare connections provided.

Brazing

or soldering will damage the sensor.

The differential pressure control should have the pressure tap

labelled liquid connected to the liquid line and the tap labelled suction connected to the suction line.

Page 7

TABLE 6 CONDENSING UNIT CHARGE(LBS.)

AMBIENT TEMPERATURE F

RHPIRHQ

0070-M

OlOB-L 01OB-M

015B-L 015B-M

02OB-L 02OB-M 020B-H

03OB-L 030B-M 03OB-H

05OB-L

05oB-M OBOB-H

075B-L 075B-M 075B-H

lOOB-L lOOB-M IOOB-H

10 0

4.7

4.5

4.7

5.6

5.9

5.6

5.9 6.0 6.1

5.4

10.4

10.9

9.9

18.2 I 18.7

34.6 35.5 36.1 37.0

36.5 37.4

33.2 33.9 34.6

4.8 4.9 5.0

4.6

4.8

5.7 7

610

5.7

5.5 5.6

I 10.5

11.1 11.3

10.1

-10

4.7 419

2::

Tmp5.8

10.7

10.3

19.0 I 19.5 1

38.0 38.9

-20 lower

4.8

5.0

5.9

6.2

5.9

6.2

5.7

11 .o

11.6

10.6

35.5

TABLE 7

LGTH.

LIQ. LINE O.D. OF LIQUID LINE

(FT.)

20 0.34

30 0.51 40 50 60

70 1.19

100

l/4

0.17 0.47

0.68

0.85 2.35 1

.02

1.36 3.76 6.96 11.20

1.53 4.23 7.88 12.60

1.70 4.70 8.70 14.00

CHARGING AND INITIAL STARTUP

Make sure all electrical

The compressor oil level ter of the sight glass.

Make sure the compressor They should be tightened under the hold down nuts Check all system controls and adjust if necessary.

4. in pressure of the low pressure switch for the lowest ambient in

which the condensing unit will be operated, using Table 8.

the cut-out pressure low enough to avoid short cycling.

Make sure compressor suction and discharge valves are back-seated.

Attach charging line to charging port on liquid line valve and

6. front-seat the valve. Turn on electrical power to the condensing unit and the unit

7. cooler(s).

Open the valve on the refrigerant cylinder and begin charging liquid refrigerant into the system.

when the low pressure switch closes.

total system charge, as calculated,

When the correct charge has been added back-seat the liquid line valve.

Page 10

LIQUID LINE CHARGE

3/a

0.94

1.41 1

2.82

3.29

.88

connections are tight.

should be at or slightly above the Use only Suniso 3G or 3GS compressor oil. hold down bolts are properly tightened. to the point where the rubber spacers

just begin to deform.

WEIGHT OF REFRIGERANT (LB.)

l/2

0.87 1.40

1.74

2.61 4.20

3.48 5.60

4.35 7.00

5.22 8.40

6.09 9.80

518

2.80

The compressor will start

Continue charging until the

has been added to the system.

718

2.90 4.95

5.80 9.90

8.70 14.85 22.65

11.60 19.80 30.20

14.50 24.75 37.75

17.40

20.30 34.65 52.85

23.20 39.60 60.40

26.10 44.55 67.95

29.00 49.50 75.50

Ill8

29.70

1 318

7.55

15.10

45.30

cen-

Set the

cut-

Set

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