Carrier 50WQ User Manual

Number One AirConditbninq Maker

Division of Carrier Corporation

Carrier Parkway • Syracuse NY 13221

Single-Package

Water Source Heat Pumps

SAFETY CONSIDERATIONS INTRODUCTION

...................................................

INSTALLATION....................................................2-4

Step 1 — Check Equipment and Jobsite

• UNPACKAGE UNIT

• INSPECT EQUIPMENT

• COMPLETE OR CONSIDER THESE

..................................................................

SYSTEM REQUIREMENTS

Step 2 — Connect Supply Ductwork Step 3 — Make Piping Connections

• CONNECT WATER SUPPLY AND RETURN LINES

• INSTALL BALANCING VALVES

• INSTALL WATER REGULATING VALVES

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Page

INDEX

' ; '*• : '^•s\- >:■ .vt •:■ ; ': <?!v:'! ••• ■ ' .*!^ '; *r\ *i ^*;'!';'i’;*

• MAKE CONDENSATE DRAIN LINE CONNECTION

Step 4 — Make Electrical Connections.. 3,4

• INSTALL A BRANCH CIRCUIT DISCONNECT PER NEC

• BRING POWER LEADS INTO UNIT

• CONNECT GROUND LEAD TO GROUND LUG IN SPLICE BOX

• SET FAN MOTOR SPEED

• CONNECT CONTROL POWER WIRING

START-UP

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SERVICE...............................................................6

MAINTENANCE

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Page

SAFETY CONSIDERATIONS

Installation and servicing of air conditioning equipment can be hazardous due to system pressure and electrical components. Only trained and quali fied service personnel should install, repair or service air conditioning equipment.

Untrained personnel can perform basic mainten

ance functions of cleaning coils and cleaning and

replacing filters. All other operations should be performed by trained service personnel. When working on air conditioning equipment, observe precautions in the literature, tags and labels attached to the unit and other safety precautions that may apply.

Follow all safety codes. Wear safety glasses and

work gloves. Use quenching cloth for brazing

operations. Have fire extinguishers available for all

brazing operations.

WARNING; Before performing service or

mabiienaace operations oa system, turn off

rsi^ swsidr io sodoor anti and oatdoor

onit, Tam acces&oiy Sweater power switch if

applicate. shock, conld cause per-

I'duct conn

FLANGE

Fig. 1 — Dimensions and Connections

Form 50WQ-2SI

' " Table 1

MODEL 50WQ OPER WT (lb) DIMENSIONS (ft-in.)

B 1-9-1/8 C

SUPPLY DUCT CONN.

(ft-in.) F

FILfER (1) Disposable. 1 -in thick

Size (in.)

1 014

220

2-10-5/16

0- 1-1/2 0- 1-5/8

0-11-1/4 0-10-1/4 0-10-1/4

16x20

— Installation Data (s®e Fi^- 1)

018

240

2-10-5/16 2-10-5/16 3- 2-5/16 1 0- 1-1/2 0- 1-1/2 0- 1-1/2

0- 1-5/8

0-11-1/4 0-11-1/4 0-11-1/4 1

16x20

022

260

1-10-1/8 (Includes Filter Section)

0- 7-5/8

0-11-7/8

16x20

027 1 033

,^270 f

0- 7-5/8

0-11-7/8

•

290

3- 2-5/16

0- 1-1/2 0- 7-5/8

0-11-1/4 0-11-7/8

20x20 20x20

3- 2-5/16

042

320

0-3

0- 5-7/8

0-10-1/4

1- 1-5/8

INTRODUCTION

The 50WQ units are completely self-contained

cooling and heating systems. They are water-to-air heat pumps designed for indoor installation. They may be connected into existing duct systems which are properly sized and designed to handle air quantity of 350 to 450 cfm per ton of cooling. Re quired connections include supply air duct, water supply and return lines, high- and low-voltage wiring. Factory-supplied air filter is installed in rack on unit return air section. See Table I for filter size.

Use recommended thermostat and subbase (Table 3)

for proper unit operation.

INSTALLATION

Step 1 — Check Equipment and Jobsite

UNPACKAGE UNIT — Move to final location. Slide from carton taking special care not to damage service valves or grilles.

INSPECT EQUIPMENT — File claim with ship ping company if shipment is damaged or incomplete.

COMPLETE OR CONSIDER THESE SYSTEM

REQUIREMENTS before installation:

a. Consult local building codes and National Elec

trical Code (NEC) for special installation requirements.

b. Consider type of water source. Ensure there is an

adequate supply of water at temperature of 45 F to 90 F with minimum pressure of 10 psig.

c. Provide sufficient space for water piping, con

densate drain, wiring and servicing unit. See

Fig. 1. When front (external) water piping

connections are used, locate unit so piping does

not block front access panels. (Units installed in

confined areas may have to be removed for major

servicing such as compressor or fan motor replacement.)

d. Provide a minimum 6-in. clearance between

return air filter and adjacent wall.

e. Mount 50WQ on floor or solid platform so unit is

elevated. Make sure unit is supported from the bottom. To reduce sound transmission, es pecially when 50WQ is located in a closet or utility room having louvered doors, the following

acoustical treatment is recommended; place an isolation pad under unit. Pad must be same size as unit base. Construct a 1-in. fiberglass sound shield in front of unit.

Step 2 — Connect Supply Ductwork to unit

supply air duct connection flange. Refer to Fig. 1

and Table 1 for connection size and location. If

necessary, refer to Carrier System Design Manual, Part 2, for system air duct design. When designing and installing ductwork, consider the

following:

a. Size duct for 350 to 450 cfm per ton of cooling

capacity. b. Avoid abrupt duct size increases and reductions. c. Use flexible connectors between ductwork and

unit to prevent transmission of vibration.

BALANCING VALVES (2) WITH SHUTOFF

MIN

SUPPLY RETURN WATER WATER

CONDENSATE TRAP

CONDENSATE DRAIN

Fig. 2 — Water Piping

'WATER

REGULATING VALVE

► AIRFLOW

Table 2 — Electrical Data (60-Hz)

MODEL

50WQ

■ "014*“

018

022

027 033

""042

" 033"-

042 033

042

FLA — Full Load Amps LRA — Locked Rotor Amps RLA — Rated Load Amps

*Permissible limits of the voltage range at which the units will

operate satisfactorily

fRequired when using nonmetallic conduit

V/PH

208-230/1

" -23Ö/T-

208-230/3

460/3

OPER

VOLTAGE*

Max

253

253 253

506

COMPRESSOR ’ FAN

Min

197

187

414

LRA RLA

37 5 54 0 134 65 0

75.0 88 0

100 0

75 0 80 0 18 5 3 2 12 54 10 40

30 0 36 5

____

.. 1

FLA Wire Size

60 69

'07”

0.9 1 7

2 5 12

1 1 14 1 6

r -9 6"

133 1 5 16 2 23 3

27 7 32 To 56

13 8' ' '2 5 ■ "'""14

Power

(AWG)

Ï4 14 14 14

.............

152 12 " ■

NOTES

Fan motors are 208-v, 230-v or 460-v single phase

All units equipped with 24-v transformer for external control circuit

Copper wire sizes based on 60 C Use copper or copper-clad

aluminum wire only.

BRANCH CIRCUIT

Max Ft

Wire

41 33

43 10

135 118 14 15

Gnd

Wire Sizef

(AWG) Amps

14 14 14 30 12 35

u. ...

14 15

Max

Fuse

20 30

50 6Ö 30

■ **? Min

Circuit

Amps

”'1"2 7 "■

17.7 18 1

22 0

31 6

-"sT?"'

Ï9 8 ^ 26 3

. ^ -

102

Table 3 — Accessories

PART NO.

Fh0Ta"D042'

HH93ÄZÖ44^

38CQ900141

DESCRIPTION UNIT

Honeywell thermostat | Ail Thermostat Subbase ~j All Solid-State Time Guard® Device

(Six 38CQ900152)

All

d. Ducts passing thru an unconditioned space must

be insulated and covered with vapor barrier in accordance with the latest issue of SMACNA

(Sheet Metal and Air Conditioning Contractor’s National Association) and NESCA (National Environmental Systems Contractor’s Associa

tion) minimum installation standards for resi

dential heating and air conditioning systems.

Step 3 — Make Piping Connections

CONNECT WATER SUPPLY AND RETURN LINES to water inlet and outlet pipe connections shown in Fig. I and 2. Place plug in unused connec tions. Use flexible hose for water line to reduce possible vibration and improve unit serviceability.

Make sure hoses or pipes are suitable for system

water pressure and sized for proper flow rate.

CAUTION: Improper heat exchanger water

flow due to pjpiiîg, valving or improper pump

operation is hazardous to units.

For water flow and temperature data refer to

Start-Up section, page 4.

CAUTION: Galvanized pipe or fittings are not recomtnended for use with these units due to possible electrolysis.

INSTALL BALANCING VALVES (with shutoff)

in water supply and return lines for water flow

adjustment and a means of water shutoff, if neces sary, when servicing unit. When multiple units are conneeted to a eooling tower, valves permit removal of one unit without interrupting water flow to other units.

INSTALL WATER REGULATING VALVES (if used) in water supply line near unit. Multiple unit installations using cooling tower water do not

normally use a water regulating valve.

MAKE CONDENSATE DRAIN LINE CON

NECTION to female pipe connection provided on

unit. Fig. 2. Install a trap in condensate line as close

as possible to unit. Trap must be at least 3 in. deep

and not higher than the bottom of unit condensate

drain opening. Pitch condensate line to open drain

or sump. Insulate a condensate drain line located above a living area.

Step 4 — Make Electrical Connections — Field

wiring must comply with local and national fire, safety and electrical codes. Voltage to unit must be within the operating voltage range indicated on nameplate or in Table 2. On 3-phase units, phases must be balanced within 2%.

Operation of unit on improper line voltage or with excessive phase imbalance constitutes abuse and is not covered by Carrier Warranty.

INSTALL A BRANCH CIRCUIT DISCONNECT PER NEC of adequate size to handle unit starting current. Locate disconnect within sight of and readily accessible from the unit, per Section 440-14 of National Electrical Code (NEC).

BRING POWER LEADS INTO UNIT — Extend leads from diseonnect per NEC thru hole provided (Fig. 1) into line wiring splice box. Fig. 3.

CONNECT GROUND LEAD TO GROUND

LUG IN SPLICE BOX for safety. Connect power

wiring. See Fig. 3. Splice line power leads to yellow

and black pigtails on single-phase units or yellow

pigtails on 3-phase units. Use wire nuts. Tape each

connection.

Unit transformer on 208-230-volt units is factory wired for 230/24-volt operation. For 208/24-volt operation, remove black (230-v) transformer lead from unit contactor and connect red (208-v) lead to contactor. Cap unused transformer lead.

1-PHASE CONN TO DISCONNECTPER NEC

_____

GROUND LEAD

—^YEL —

—^BLK —

,__^GROUND

—Hä] LUG

50WQ HEAT PUMP CONTROL BOX

I-PHASE

3-PHASE CONN. TO DISCONNECTPER NEC

_____

----- _

GROUND LEAD

—^YEL —

^^YEL-

,__^GROUND

—CöJlug

50WQ HEAT PUMP CONTROL BOX

3-PHASE

Fig. 3 — Line Power Connections

SET FAN MOTOR SPEED — All units are factory wired for high fan speed operation. Set fan motor for medium or low speed operation as follows:

1. Remove unit fan section access panel.

2. Locate Molex fan speed selector block on fan housing, Fig. 5. Selector block receptacle 1 is high fan speed, receptacle 2 is medium fan speed and receptacle 3 is low fan speed. Yellow and black fan motor power leads from control box are connected to selector block receptacle C and

1. Yellow lead is common, black lead is speedchange lead.

3. Change fan motor speed by removing black lead from selector block receptacle 1 and plugging it

into receptacle 2 or 3. Receptacle 4 is not used.

CAUTiONt For proper rniit operaiioit, set unit

fast inoitor ;^>eed ibr air tjuantity mtìàa range

&ÌK>wn in Tabie 4,

Set fan motor speed on 460-volt units — Two-speed fan motor is factory wired for high-speed operation. (Yellow and black power leads from control box are connected to the yellow and black fan motor leads.)

Change fan motor to low speed by wiring as follows:

1. Splice the violet and black fan motor leads together.

2. Splice yellow and black power leads from control box to yellow and red motor leads. (Yellow-toyellow and black-to-red.)

CONNECT CONTROL POWER WIRING (24-v)

— Power leads are brought thru 1 / 2-in. hole pro vided in unit. Fig. 1. Extend leads to low-voltage terminal board located on top of control box. Fig. 5.

Connect leads to terminal board as shown in Fig. 3.

Use room thermostat HH01AD042 and thermo stat subbase HH93AZ044 for proper unit operation. Be sure that field-installed jumper wire is connected between subbase terminals W and Y. Set thermo stat heat anticipator at 0.45 amp for 1-phase units and 0.50 amp for 3-phase units.

2. Ensure that water temperature entering unit is between 45 F minimum and 90 F maximum. For water temperature below 60 F, insulate supply line and install a secondary drain pan under the unit to remove condensate from heat exchanger and internal plumbing.

CAUTION: Water teniperattJre otttside

specified temperature range may cause damage to uiijt.

3. Ensure that supply water is clean and air is purged from system. Air in supply water causes scaling in heat exchanger. Foreign material in water and/or excessive velocity of water can cause damage to tubing.

4. When using a semi-closed system with an “open” cooling tower, a water treatment system should be operational with initial water flow.

To Start Unit — Ensure that air filter is in place on

unit filter flanges provided. Do not operate unit without filter in place. Adjust the thermostat as follows:

1. Set selector switch at OFF.

2. Turn on main disconnect switch to unit.

3. Set fan switch as desired (ON or AUTO.).

4. Set thermostat dial at desired temperature.

5. Set selector switch at HEAT or COOL.

Check system refrigerant charge. See Refrigerant

Charging on page 6.

-^Unit Single-Phase Compressors that are

equipped with a compressor start thermistor (PTC device) — When supply voltage is within limits indicated on nameplate and compressor will not start, check the thermistor with an ohmmeter.

If the PTC is good, and the compressor does not start, disconnect the PTC from the starting circuit and give unit a temporary capacitance boost. Refer to Carrier Standard Service Techniques Manual, Chapter 2, for details on capacitance boost pro cedure. If unit does not start with capacitance boost, compressor may be defective. If unit does not start, check starting capability with PTC assistance. If questionable, remove PTC, add start capacitor and

start relay per start kit installation instructions.

WARNINGc Caftaciiaace boosa or ijistaliatioa of start capadtor and start shtutki be per^ fonued by irauted persoaaet improper procedrn» couici cause tajtjry or equipoaeat

damage.

START-UP

Water Flow and Temperature Data

1. Consider design water flow rates for efficient operation. See Table 4 for permissible water flow range.

Unit Controls and Safety Devices

HIGH-PRESSURE RELIEF VALVE (except 50WQ0I4) is located in compressor. Relief valve opens at a pressure differential of approximately 550 psi between suetion (low side) and discharge (high side) to allow pressure equalization.

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