McQuay CMU Installation Manual

Horizontal Water Source Heat Pump Units

Contents

Model Nomenclature . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Transportation & Storage . . . . . . . . . . . . . . . . . . . . . . . 2

Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5

Electrical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Cleaning & Flushing System . . . . . . . . . . . . . . . . . . . . 7

Start-up. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Operating Limits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Ty pical Wiring Diagrams . . . . . . . . . . . . . . . . . . . . 10-13

Unit Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . 14-15

Sequence of Operation . . . . . . . . . . . . . . . . . . . . . . . 16

Thermostat Connections. . . . . . . . . . . . . . . . . . . . 17-18

Options for Mark IV/AC Units . . . . . . . . . . . . . . . . 19-22

Field Installed Options on MicroTech Units . . . . . . . . 23

Troubleshooting WSHP . . . . . . . . . . . . . . . . . . . . . . . 24

Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Installation & Maintenance Data

Group: WSHP

Part Number: 106581301

Date: March 2002

IM 526-15

Page 2 / IM 526

Transportation & Storage

Installation

General

Upon receipt of the equipment, check carton for visible damage. Make a notation on the shipper’s delivery ticket before signing. If there is any evidence of rough handling, immediately open the cartons to check for concealed damage. If any damage is found, notify the carrier within 48 hours to establish your claim and request their inspection and a report. The Warranty Claims Department should then be contacted.

Do not stand or transport the machines on end. For stor-

ing, each carton is marked with “up” arrows.

In the event that elevator transfer makes up-ended positioning unavoidable, absolutely ensure that the machine is in the normal upright position for at least 24 hours before operating.

Temporary storage at the job site must be indoors, completely sheltered from rain, snow, etc. High or low temperatures naturally associated with weather patterns will not harm the conditioners. Excessively high temperatures, 140°F (60°C) and higher, may deteriorate certain plastic materials and cause permanent damage.

1. To prevent damage, this equipment should not be operated for supplementary heating and cooling during the construction period.

2. Inspect the carton for any specific tagging numbers indicated by the factory per a request from the installing contractor. At this time the voltage, phase and capacity should be checked against the plans.

3. Check the unit size against the plans to ensure unit installation is in the correct location.

4. After removing the carton, remove the hanger kit from the fan housing.

5. Before installation, check the available ceiling height versus the height of the unit.

6. Note the location and routing of water piping, condensate drain piping, and electrical wiring. The locations of these items are clearly marked on submittal drawings.

7. The installing contractor will find it beneficial to confer

with piping, sheet metal, ceiling and electrical foremen before installing any conditioners.

8. Remove all shipping blocks in the fan wheel.

9. Change the airflow direction from straight discharge to end discharge or vice versa before the unit is installed in the ceiling. Refer to the section in this bulletin for instructions.

10. We recommend that the contractor cover the conditioners with plastic film to protect the machines during finishing of the building. This is critical while spraying fireproofing material on bar joists, sandblasting, spray painting and plastering. If plastic film is not available, the shipping carton may be modified to cover the units during construction.

11. On units with spring mounted compressors, remove the hold-down bolt from the bottom of the unit before starting compressor.

Model Nomenclature

Product Catagory

W = WSHP

Product Identifier

See box below

Design Series

1 = A Design 4 = D Design 2 = B Design 5 = E Design 3 = C Design

Nominal Capacity

007 = 7,000 015 = 15,000 009 = 9,000 019 = 19,000

012 = 12,000 etc....

Note: Installation and maintenance are to be performed only by qualified personnel who are familiar with local codes and regulations, and are experienced with this type of equipment. Caution: Sharp edges are a potential injury hazard. Avoid contact with them.

W CDD 1 009 D Z

Coil Options

None

Voltage

E=208/230-60-1 F=208/23-60-3 J=265-60-1 K=460-60-3 L= 575-60-3 M=230-50-1 N = 380-50-3

McQuay Product Identifiers

CDD = Ceiling mtd./DDC Controls/Ext. Range/Less Board CME = Ceiling mtd./Mark IV/Ext. Range CDE = Ceiling mtd./DDC Controls/Ext. Range CMG = Ceiling mtd./Mark IV/Geothermal CDL = Ceiling mtd./DDC Controls/Std. Range/Less Board CMS = Ceiling mtd./Mark IV/Std. Range CDS = Ceiling mtd./DDC Controls/Std. Range CMU = Ceiling mtd./Mark IV/European Spec.

UNIT DIMENSIONS (mm)

SIZE A B C D E F G 006 – 012 965 921 914 584 632 683 546 015 – 019 1067 1022 1016 610 660 711 571 024 – 030 1114 1069 1067 660 711 762 622 036 – 042 1245 1200 1194 660 711 762 622 048 – 060 1524 1480 1473 711 762 813 673

Figure 1A. Hanger bracket detail, sizes 007 thru 060

Figure 1B. Hanger bracket detail, sizes 070 thru 120

UNIT DIMENSIONS (INCHES)

SIZE A B C D E F G H 007 – 012 38 36 321⁄2 201⁄4 22 181⁄2 34 20 015 – 030 44 42 381⁄2 201⁄4 22 181⁄2 40 20 035 – 042 50 48 441⁄2 201⁄4 22 181⁄2 46 20 048 & 060 545⁄16 525⁄16 48 285⁄32 30 26 50 28 070 – 120 See Figure 1B

IM 526 / Page 3

Unit Location

1. Locate the unit in an area that allows for easy removal of the filter and access panels. Leave enough space for service personnel to perform maintenance or repair. Provide sufficient room to make water, electrical and duct connections.

2. The contractor should make sure that adequate ceiling panel access exists, including clearance for hanger brackets, duct collars and fittings at water and electrical connections.

3. Allow adequate room below the unit for a condensate trap and do not locate the unit above pipes.

4. Each unit is suspended from the ceiling by four threaded rods. The rods are attached to the unit corners by a hanger bracket through a rubber isolator. Caution: Do not use rods smaller than specified below. The rods must be securely anchored to the ceiling or to the bar joists.

Figure 1C. Unit sizes 007 thru 060

Figure 1E. Unit sizes 070 thru 120

5. Each unit is furnished with a hanger kit. The kit is shipped unassembled and includes hanger brackets, rubber isolators, washers, bolts and lock washers. Lay out the threaded rods per the dimensions in Figures 1A and 1B. Assemble the hangers to the unit as shown in Figures 1C, 1D and 1E. Securely tighten the brackets to the unit.

6. When attaching the hanger rods to the unit, a double nut is recommended since vibration could loosen a single nut. The installer is responsible for providing the hex nuts when installing hanger rods.

7. Leave minimum 3" (76 mm) extra threaded rod below the double nuts or minimum 3" (76 mm) clearance between top of unit and ceiling above to facilitate top panel removal for servicing

8. The unit should be pitched towards the drain in both directions to facilitate condensate removal.

UNIT DIMENSIONS (mm)

SIZE A B C D E F G H 007 – 012 965 914 826 514 559 470 864 508 015 – 030 1118 1067 978 514 559 470 1016 508 035 – 042 1270 1219 1130 514 559 470 1168 508 048 & 060 1380 1329 1219 715 762 660 1270 711 070 – 120 See Figure 1B

Hanger bracket dimensions

⁄8" Threaded Rod

(By Others)

Vibration Isolator

Washer

Hex Nuts (By Others)

Bolt & Lock Washer

By McQuay International

By Others

Hanger bracket dimensions for WCMU type units

5/8

” Threaded Rod (

By Others)

Coil

Airflow

Fan

Assembly

Control

Box

Comp

C G

1-15/16"

(51 mm)

1-7/8"

(48 mm)

Fan

Assembly

Airflow

Coil

80" (2032 mm)

82" (2083 mm)

44"

(1118

mm)

42"

(1067

mm)

(51 mm)

Comp

Control Box

(51 mm)

Page 4 / IM 526

h =

amount to provide a grip for removing.)

2. Adjust sheave pitch diameter for desired speed by opening moving parts by half or full turns from closed position. Do not open more than five full turns.

3. Replace external key “E” and securely tighten setscrews “B” over key and setscrews “C” into keyway in fixed half of the sheave.

4. Put on belts and adjust belt tension to 4 lbs. ±0.7 lbs. (18N ±3N) for a

⁄2" to 3⁄4" (13 mm to 19 mm) belt deflec-

tion height.

5. To determine the deflection distance from normal position, use a straightedge or stretch a cord from sheave to sheave to use as a reference line. On multiple-belt drives an adjacent undeflected belt can be used as a reference.

6. Future adjustments should be made by loosening the belt tension and increasing or decreasing the pitch diameter of the sheave by half or full turns as required. Readjust belt tension before starting drive.

7. Be sure that all keys are in place and that all setscrews are tight before starting drive. Check setscrews and belt tension after 24 hours service.

8. When new V-belts are installed on a drive, the initial tension will drop rapidly during the first few hours. Check tension frequently during the first 24 hours of operation. Subsequent retensioning should fall between the minimum and maximum force.

Unit Motor RPM Factory Motor Sheave Size HP Range Setting (RPM) Position

⁄2 756 – 902 785 4 Turns Open

070

3 907 –1081 904 5 Turns Open 1

⁄2 698 – 832 858 11⁄2 Tu rns Open

090

3 907 –1081 904 5 Turns Open 3 756 – 901 814 3 Turns Open

120

5 907 –1081 904 5 Turns Open

Air Balancing

Unit sizes 070 thru 120 are supplied with a variable pitch motor sheave to aid in airflow adjustment. They are set at the factory according to Chart 1 shown below.

When the final adjustments are complete, the current draw of the motors should be checked and compared to the full load current rating of the motors. The amperage must not exceed the service factor stamped on the motor nameplate.

Upon completion of the air balance, it is a common industry recommendation that the variable pitched motor sheave be replaced with a properly sized fixed sheave. A matching fixed sheave will provide longer belt and bearing life and vibration free operation. Initially, it is best to have a variable pitched motor sheave for the purpose of air balancing, but once the balance has been achieved, fixed sheaves maintain balancing and alignment more effectively.

Adjustment (See Figure 2)

1. All sheaves should be mounted on the motor or driving

shaft with the setscrew “A” toward the motor

2. Be sure both driving and driven sheaves are in alignment

and that shafts are parallel.

3. Fit internal key “D” between sheave and shaft, and lock

setscrew “A” securely in place.

Adjusting

1. Loosen setscrews “B” and “C” in moving parts of sheave

and pull out external key “E”. (This key projects a small

Single Groove

Key E projects to provide a grip for removing.

Figure 3. Drive belt adjustment

Figure 2.

Chart 1A. 60 Hz

()

Where: t=Span length, inches (mm)

C=Center distance, inches (mm) D=Larger sheave diameter, inches (mm) d=Smaller sheave diameter, inches (m) h=Deflection height, inches (mm)

Note: The ratio of deflection to belt span is 1:64.

Chart 1B. 50 Hz

Filter Access

t = C2–

D-d

Unit Motor RPM Factory Motor Sheave Size HP Range Setting (RPM) Position

070 11⁄2 756 – 901 786 4 Turns Open 090 11⁄2 720 – 860 858 11⁄2 Tu rns Open 120 3 756 – 902 815 3 Turns Open

Each unit is shipped with a filter bracket for side filter removal. For bottom removal push the filter up into top bracket to gain clearance of bottom bracket and remove the filter. Also, a sheet metal duct filter retainer can be fabricated when return air duct work is used.

Span Length (t)

fle

tio



IM 526 / Page 5

Air Discharge Conversion

Unit sizes 007 thru 060 can be shipped as straight discharge air or end discharge air arrangement. Most likely, the unit will have to be converted from straight discharge to end discharge. To accomplish this:

1. Remove top panel.

2. Remove the access panel to the fan motor. Remove the piece of insulation at the bottom on the side of the bottom panel.

3. Remove the fan discharge panel, rotate it 180 degrees, and move it to the other side. In other words, with

straight air discharge the housing is bottom horizontal and with an end discharge the housing is top horizontal.

4. Remove the three bolts holding the fan motor on and rotate it so that the motor oilers are in the up position.

5. Install insulation base panel below new access panel location.

6. Reinstall the top panel.

7. Reinstall the piece of insulation and the access panel.

Ductwork & Attenuation

Discharge ductwork is normally used with these conditioners. Return air ductwork may also be required.

All ductwork should conform to industry standards of

good practice as described in the ASHRAE Systems Guide.

The discharge duct system will normally consist of a flexible connector at the unit, a transition piece to the full duct size, a short run of duct, an elbow without vanes, and a trunk duct teeing into a branch duct with discharge diffusers as shown in Figure 4. The transition piece must not have angles totaling more than 30° or severe loss of air performance can result. Do not connect the full duct size to the unit without using a transition piece down to the size of the discharge collar on the unit. With metal duct material, the sides only of the elbow and entire branch duct should be internally lined with acoustic fibrous insulation for sound attenuation. Glass fiber duct board material is more absorbing and may permit omission of the canvas connector.

The ductwork should be laid out so that there is no line of sight between the conditioner discharge and the distrib-

ution diffusers.

Return air ducts can be brought in through a low side wall filter-grille and then up through the stud pieces to a ceiling plenum or through air ceiling filter-grilles. The ceiling filter-grille must not be placed directly under the conditioner.

Return air ductwork can be connected to the standard filter rack. See Figure 5 (side filter removal shown). The filter rack can be installed for bottom filter removal or side filter removal by locating the brackets. For side filter removal the brackets should be located on the bottom, left side, and top. For bottom filter removal the brackets should be mounted on the left side top and right side with the spring clips supporting the filter.

Do not use sheet metal screws directly into the unit cabinet for connection of supply or return air ductwork, especially return air ductwork which can hit the drain pan or the air coil.

Figure 4.

Figure 5. Filter rack/return air duct collar

2x2 Ft. Diffuser (Example Only)

Branch Duct Internally Lined With Acoustic Fibrous Insulation

Trunk Duct

Square Elbow

Canvas Collar

Heat Pump

Transformation

Piece

Discharge Collar

On Heat Pump

Both Sides Internally Lined With Acoustic Fibrous Glass Insulation

Suggested Duct Layout For

Multiple Diffuser Application

Standard 1" (25mm) and 2" (51 mm) for sizes 007 thru 060

Standard 2" (51 mm) for sizes 070 thru 120

Ventilation may require outside air. The temperature of the ventilation air must be controlled so that mixture of outside air and return air entering the conditioner does not exceed conditioner application limits. It is also typical to close off the ventilation air system during unoccupied periods (night setback).

The ventilation air system is generally a separate build-

Ventilation Air

ing subsystem with distribution ductwork. Simple introduction of the outside air into each return air plenum chamber reasonably close to the conditioner air inlet is not only adequate, but recommended. Do not duct outside air directly to the conditioner inlet. Provide sufficient distance for thorough mixing of outside and return air. See Operating Limits on page 10.

Page 6 / IM 526

Electrical Data

1. Verify the compatibility between the voltage and phase of the available power and that shown on the unit serial plate. Line and low voltage wiring must comply with local codes or the National Electrical Code, whichever applies.

2. Apply correct line voltage to the unit. A

⁄8" (22mm) hole

and/or a 1

⁄8" (29 mm) knockout is supplied on the side of the unit. A disconnect switch near the unit is required by code. Power to the unit must be sized correctly and have dual element (Class RK5) fuses or an HACR circuit

General

breaker for branch circuit overcurrent protection. See the nameplate for correct ratings.

3. Three phase 50 cycle units, 380/50/3, require a neutral wire for 230/50/1 power to the fan circuit.

4. Connect the thermostat/subbase wiring with the power “off ” to the unit.

5. Field supplied relays installed on the input terminals

W1, W2, Y1, Y2 or G may introduce electrical noise. Never install relay coils in series with the inputs.

230 Volt Operation

Fan Assembly

All 208-230 volt single-phase and three-phase units are factory wired for 208 volt operation. For 230 phase operation, the line voltage tap on the 24 volt transformer must be

All fan motors are multi-speed, PSC type with integral mounting brackets and thermal overload protection. The motor is isolated from the fan housing for minimum vibration transmission. Fan motors have a terminal strip on the motor body for simple motor speed change without going back to the control box. All the fan/motor assemblies have a removable orifice ring on the housing to accommodate

changed. Disconnect and cap the red lead wire and interchange it with the orange lead wire on the primary of the 24 volt transformer.

Figure 6. Sizes 006 through 012

Piping

1. All units should be connected to supply and return piping in a two-pipe reverse return configuration. A reverse return system is inherently self-balancing and requires only trim balancing where multiple quantities of units with different flow and pressure drop characteristics exist in the same loop. Check for proper water balance by measuring differential temperature reading across the water connections. To insure proper water flow, the differential flow should be 10°F to 14°F (5°C to 8°C) for units in cooling mode.

A direct return system may also work acceptably, but proper water flow balancing is more difficult to achieve and maintain.

2. The piping can be steel, copper or PVC.

3. Supply and return runouts usually join the unit via short lengths of high pressure flexible hose which are sound attenuators for both unit operating noise and hydraulic pumping noise. One end of the hose should have a swivel fitting to facilitate removal for service. Hard piping can also be brought directly to the unit. This option is not recommended since no vibration or noise attenuation can be accomplished. The hard piping must have unions to facilitate unit removal. See Figure 7 for typical piping setup.

4. Some flexible hose threaded fittings are supplied with sealant compound. If not, apply Teflon tape to assure a tight seal.

5. Supply and return shutoff valves are required at each conditioner. The return valve is used for balancing and should have a “memory stop” so that it can always be closed off but can only be reopened to the proper position for the flow required.

6. No unit should be connected to the supply and return piping until the water system has been cleaned and flushed completely. After the cleaning and flushing has taken place, the initial connection should have all valves wide open in preparation for water system flushing.

7. Units with water regulating valves need to have the capillary routed outside the unit through a notch in the access panel. Be sure to install the split rubber grommet (supplied) in this notch to protect the capillary and check to ensure that all other parts of the capillary do not contact other steel or copper parts. Install the valve in the return water line.

8. Condensate piping can be steel, copper or PVC. Each unit includes a condensate connection.

motor and fan wheel removal without disconnecting the ductwork. The fan housing protrudes through the cabinet allowing adequate material for connection of flexible duct. Each model unit is shipped from the factory for maximum performance and minimum sound requirements. Fan sound levels and performance can be effected by external static pressure

Figure 6a. Sizes 015 through 060

FAN

MOTOR

FAN

MOTOR

WHITE (COMMON)

BROWN (CAPACITOR)

BLUE (HIGH SPEED) SIZE 012

RED (LOW SPEED) SIZES 006-009, 015, 024

WHITE (COMMON)

BROWN (CAPACITOR)

BLACK (HIGH SPEED) SIZES 042, 060

BLUE (MED. SPEED) SIZES 030, 048

RED (LOW SPEED) SIZES -015, 019, 024, 036

IM 526 / Page 7

9. The condensate disposal piping must have a trap. The piping must be pitched away from the unit not less than

⁄4" per foot (21 mm per meter) (see Figure 8). Generally, the condensate trap is made of copper and soldered on the unit. A piece of vinyl hose from the trap to the drain line is used for simple removal. A complete copper or PVC condensate system can also be used. Union fittings in the copper lines should be applied to facilitate removal. Factory supplied condensate hose assemblies have pipe thread fittings to facilitate connection of a flexible vinyl or steel braided hose.

Figure 7. (Sizes 007 through 060 shown)

Figure 8.

Ball Valves

Supply

Riser

Return

Riser

Condensate

Riser

Supply Air

Optional Cleanout

⁄2"

(38 mm)

⁄2"

(38 mm)

Hanger Kits (4)

Flex Hoses

Electrical Access Panel

⁄4" Per Foot (21 mm Per Meter)

10. Do not locate any point in the drain system above the drain connection of any unit.

11. Automatic flow controlled devices must not be installed prior to system cleaning and flushing.

12. A high point of the piping system must be vented.

13. Check local code for the need for dielectric fittings.

Cleaning & Flushing System

1. Prior to first operation of any conditioner, the water circulating system must be cleaned and flushed of all construction dirt and debris.

If the conditioners are equipped with water shutoff valves, either electric or pressure operated, the supply and return runouts must be connected together at each conditioner location. This will prevent the introduction of dirt into the unit. See Figure 9.

Figure 9.

2. Fill the system at the city water makeup connection with all air vents open. After filling, close all air vents.

The contractor should start main circulator with the pressure reducing valve open. Check vents in sequence to bleed off any trapped air, ensuring circulation through all components of the system.

Power to the heat rejector unit should be off, and the supplementary heat control set at 80°F (27°C).

While circulating water, the contractor should check and repair any leaks in the piping. Drains at the lowest point(s) in the system should be opened for initial flush and blowdown, making sure city water fill valves are set to make up water at the same rate. Check the pressure gauge at pump suction and manually adjust the makeup to hold the same positive steady pressure both before and after opening the drain valves. Flush should continue for at least two hours, or longer if required, to see clear, clean drain water.

3. Shut off supplemental heater and circulator pump and open all drains and vents to completely drain down the system. Short circuited supply and return runouts should now be connected to the conditioner supply and return connections. Do not use sealers at the swivel flare connections of hoses.

4. Trisodium phosphate was formerly recommended as a cleaning agent during flushing. However, many states and localities ban the introduction of phosphates into their sewage systems. The current recommendation is to simply flush longer with warm 80°F (27°C) water.

Return Runout

Supply Runout

Mains

Flexible Hose

Runouts Initially Connected Together

Note: Do not overtorque fittings. The maximum torque without damage to fittings is 30 foot pounds. If a torque wrench is not available, use as a rule of thumb, finger-tight plus one quarter turn. Use two wrenches to tighten the union, one to hold the line and one for simultaneous tightening of the nut.

Page 8 / IM 526

Start-up

1. Open all valves to full open position and turn on power to the conditioner.

2. Set thermostat for “Fan Only” operation by selecting “Off” at the system switch and “On” at the fan switch. If “Auto” fan operation is selected, the fan will cycle with the compressor. Check for proper air delivery.

3. For those units that have two-speed motors, reconnect for low speed operation if necessary.

4. Set thermostat to “Cool.” If the thermostat is an automatic changeover type, simply set the cooling temperature to the coolest position. On manual changeover types additionally select “Cool” at the system switch.

Again, many conditioners have time delays which protect the compressor(s) against short cycling. After a few minutes of operation, check the discharge grilles for cool air delivery. Measure the temperature difference between entering and leaving water. It should be approximately 1

⁄2 times greater than the heating mode temperature difference. For example, if the cooling temperature difference is 15°F (8°C), the heating temperature difference should have been 10°F (5°C). Without automatic flow control valves, target a cooling temperature difference of 10°F to 14°F (5°C to 8°C). Adjust the combination shutoff/balancing valve in the return line to a water flow rate which will result in the 10˚F to 14°F (5°C to 8°C) difference.

5. Set thermostat to “Heat.” If the thermostat is the automatic changeover type, set system switch to the “Auto” position and depress the heat setting to the warmest selection. Some conditioners have built-in time delays which prevent the compressor from immediately starting. With most control schemes, the fan will start immediately. After a few minutes of compressor

operation, check for warm air delivery at discharge grille. If this is a “cold building” start-up, leave unit running until return air to the unit is at least 65°F (18°C).

Measure the temperature difference between entering and leaving air and entering and leaving water. With entering water of 60°F to 80°F (16°C to 27°C), leaving water should be 6°F to 12°F (3.3°C to 6.6°C) cooler, and the air temperature rise through the machine should not exceed 35°F (19°C). If the air temperature exceeds 35°F (19°C), then the water flow rate is inadequate.

6. Check the elevation and cleanliness of the condensate line. If the air is too dry for sufficient dehumidification, slowly pour enough water into the condensate pan to ensure proper drainage.

7. If the conditioner does not operate, check the following points: a. Is supply voltage to the machine compatible? b. Is thermostat type appropriate? c. Is thermostat wiring correct?

8. If the conditioner operates but stops after a brief period: a. Is there proper airflow? Check for dirty filter, incor-

rect fan rotation (3-phase fan motors only), or incorrect ductwork.

b. Is there proper water flow rate within temperature

limits? Check water balancing; backflush unit if dirtclogged.

9. Check for vibrating refrigerant piping, fan wheels, etc.

10. Do not lubricate the fan motor during the first year of operation as it is prelubricated at the factory.

11. Field supplied relays installed on the input terminals

W1, W2, Y1, Y2 or G may introduce electrical noise. Never install relay coils in series with the inputs.

5. Refill the system with clean water. Test the water using litmus paper for acidity, and treat as required to leave the water slightly alkaline (pH 7.5 to 8.5). The specified percentage of antifreeze may also be added at this time. Use commercial grade antifreeze designed for HVAC systems only. Do not use automotive grade antifreeze.

Once the system has been filled with clean water and antifreeze (if used), precautions should be taken to protect the system from dirty water conditions. Dirty water will result in system wide degradation of performance and solids may clog valves, strainers, flow regulators, etc. Additionally, the heat exchanger may become clogged which reduces compressor service life or caus-

es premature failure. A SystemSaver

from McQuay International should be employed to continuously remove solids as the system operates. Contact your local representative for further information on this device.

6. Set the loop water controller heat add setpoint to 70°F (21°C) and the heat rejection setpoint to 85°F (29°C). Supply power to all motors and start the circulating pumps. After full flow has been established through all components including the heat rejector (regardless of season) and air vented and loop temperatures stabilized, each of the conditioners will be ready for check, test and start-up, air balancing, and water balancing.

IM 526 / Page 9

Operating Limits

Extended Range

Standard Units

Units

Cooling Heating Cooling Heating

Min. Ambient Air 50˚F/10˚C 50˚F/10˚C 40˚F/5˚C 40˚F/5˚C Normal Ambient Air 80˚F/27˚C 70˚F/21˚C 80˚F/27˚C 70˚F/21˚C Max. Ambient Air 100˚F/38˚C 85˚F/29˚C 100˚F/38˚C 85˚F/29˚C Min. Ent. Air ➀ ➁ 50˚F/10˚C 50˚F/10˚C 50˚F/10˚C 40˚F/5˚C Normal Ent. Air, 80/67˚F 70˚F 80/67˚F 70˚F

dw/wb 27/19˚C 21˚C 27/19˚C 21˚C Max. Ent. Air 100/83˚F 80˚F 100/83˚F 80˚C

db/wb ➀ ➁ 38/28˚C 27˚C 38/28˚C 27˚C

➀ At ARI flow rate. ➁

Maximum and minimum values may not be combined. If one value is at maximum or minimum, the other two conditions may not exceed the normal condition for standard units. Extended range units may combine any two maximum or minimum conditions, but not more than two, with all other conditions being normal conditions.

This equipment is designed for indoor installation only. Sheltered locations such as attics, garages, etc., generally will not provide sufficient protection against extremes in

Environment

Standard units

Units are designed to start and operate in an ambient of 40°F (5°C), with entering air at 40°F (5°C), with entering water at 70°F (21°C), with both air and water flow rates used in the ARI Standard 320-86 rating test, for initial startup in winter.

Note: This is not a normal or continuous operating con-

dition. It is assumed that such a start-up is for the purpose of bringing the building space up to occupancy temperature.

Extended range units

Extended range heat pump conditioners are designed to start and operate in an ambient of 40°F (5°C), with entering air at 40°F (5°C), with entering water at 40°F (5°C), with both air and water at flow rates used in the ARI Standard 320-86 rating test, for initial start-up in winter.

Note: This is not a normal or continuous operating con-

dition. It is assumed that such a start-up is for the purpose of bringing the building space up to occupancy temperature.

temperature and/or humidity, and equipment performance, reliability, and service life may be adversely affected.

Air and water limits

Water enthalpy

Extended Range

Standard Units

Units

Cooling Heating Cooling Heating

Min. Ent. Water ➀ ➁ 55°F/13°C 55°F/13°C 40°F/5°C 40°F/5°C Normal Ent. Water 85°F/29˚C 70˚F/21°C 85°F/29˚C 70˚F/21°C Max. Ent. Air ➀ ➁ 110°F/43˚C 90°F/32°C 110°F/43˚C 90°F/32°C

Additional Information For Initial Start-up Only

Operating voltages

115/60/1 . . . . . . . . . . . . . . . 104 volts min.; 127 volts max.

208-230/60/1 . . . . . . . . . . . 197 volts min.; 253 volts max.

265/60/1 . . . . . . . . . . . . . . . 238 volts min.; 292 volts max.

230/50/1 . . . . . . . . . . . . . . . 197 volts min.; 253 volts max.

460/60/3 . . . . . . . . . . . . . . . 414 volts min.; 506 volts max.

380/50/3 . . . . . . . . . . . . . . . 342 volts min.; 418 volts max.

575/60/3 . . . . . . . . . . . . . . . 515 volts min.; 632 volts max.

Note: Voltages listed are to show voltage range. However, units operating with overvoltage and undervoltage for extended periods of time will experience premature component failure. Three phase system unbalance should not exceed 2%.

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