Carrier 50YQ User Manual

Jrt<twnna y>'	^
Numb^One

Maker	installation, Start-llp
AirConditbning

and Service instructior^

eDivision of

Carrier Cotporalio

Carrier Parkway • Syracuse NY 13221

Single-Package Heat Pumps

	Page
SAFETY CONSIDERATIONS .........................	1
INSTALLATION.................................................	, 1-4
Step 1 — Check Equipment and Jobsite	. 1

•UNPACKAGE UNITS

•INSPECT EQUIPMENT

•COMPLETE OR CONSIDER SYSTEM REQUIREMENTS

Step 2 — Mount Heat Pump Package ..

•ON THE GROUND: MOUNT HEAT PUMP ON AN ELEVATED FRAME POSITIONED ON A LEVEL CON­ CRETE PAD

•ON THE ROOF: MOUNT UNIT ON A LEVEL PLATFORM OR FRAME

Step 3 — Make Ductwork Connections

•CONNECT SUPPLY AND RETURN AIR DUCTWORK

INDEX

Step 4 — Provide for Cooling Cycle Condensate Disposal for Cooling Cycle ... 4

• CONNECT DRAIN LINE

^Step 5 — Make Electrical Connections... 4

•INSTALL A BRANCH CIRCUIT DISCONNECT PER NEC

•ROUTE LINE POWER WIRES INTO UNIT

•CONNECT GROUND LEAD TO GROUND LUG IN SPLICE BOX FOR SAFETY

•SET INDOOR FAN MOTOR SPEED

•ROUTE CONTROL POWER WIRES

•ELECTRIC HEATER INSTALLATION

START-UP.............................................................	5-7
SERVICE .............................................................	7-14
V TROUBLESHOOTING..................................	15, 16

^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 main­ tenance functions of cleaning coils and filters and replacing filters. All other operations should be per­ formed 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 oper­ ations. Have fire extinguisher available for all braz­ ing operations.

INSTALLATION

Step 1 — Check Equipment and Jobsite

UNPACKAGE UNITS — Move units to final loca­ tion. Slide units from cartons taking special care nob to damage unit.

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

COMPLETE OR CONSIDER SYSTEM RE­ QUIREMENTS before installing the 50YQ units.

Consult local building codes and National Elec­ trical Code (NEC) for special installation requirements.

Provide sufficient space for coil airflow clearance, wiring, and servicing unit. (See Fig. 1.) Locate unit where supply and return air ducts can be con­ veniently brought out to unit duct connections.

Unit may be placed with duct side as close to building as condensate drain, top removal, duct con­ nections and power connections permit. Position unit so water or ice from roof does not drop directly on top of unit or in front of coil. Make provisions for condensate drainage and defrost water disposal.

Roof installation method for 50YQ depends on building construction and special requirements of local building codes. Ensure that roof can support unit weight. Protect unit from prevailing winds to ensure adequate defrost.

© Carrier Corporation 1979

781

Form 50YQ-3SI

0'-6J3^

■g CONDUIT

CONTROL-*“»

WIRING

If DKO

ELECTRIC^

HEAT X

l| DKO

LINE

WIRING'

CONN

L> INDOOR AIRFLOW

^ OUTDOOR AIRFLOW

RIGHT SIDE VIEW

Ceitified dimension drawings available on request

Fig. 1 Dimensions and Connections

Table 1 — Installation Data (See Fig. 1)

UNIT	50YQ024	50YQ030
OPER WEIGHT (lb)	303	320
DTMENSTONS (ft-in )
A
B
C'	1-11-5/8	1-11-5/8
DUCT CONN (ft-in )
D	1- 7-3/4	1- 7-3/4
FILTER SIZEt (in.)
Disposable	20x25	15x20 (2)
Permanent	15x20	20x20
‘Dimension "C" includes 1-in built-in base support		channels
fRecommended field-supplied filters are 1-in thick

Step 2 — Mount Heat Pump Package

ON THE GROUND; MOUNT HEAT PUMP ON AN ELEVATED FRAME POSITIONED ON A LEVEL CONCRETE PAD See Pig. 2 for pad dimensions. Ensure pad does not obstruct coil slots in unit basepan. (Slots drain water during heating and defrost cycles. See Fig. 2 for drain slot loca­ tions.) Construct pad a minimum of 6 in. thick to provide clearance under basepan coil slots for drainage and ice buildup. In areas where prolonged subfreezing temperatures or snowfall occur, increase clearance to 12 to 18 inches by constructing an angle-iron frame to support unit 12 to 18 in. off concrete base. Design cross angle of frame so as to not obstruct basepan coil slots. See Fig. 3 for recom­ mended frame construction. Alternate construction should follow dimensions. Extend a 24-in. gravel apron around pad for condensate and defrost water drainage field.

ON THE ROOF: MOUNT UNIT ON A LEVEL PLATFORM OR FRAME — Elevate unit for proper clearance as described under ground installa­ tion above. Design roof and plan water runoff so as to prevent unit and its duct flashing from sitting in water, in accordance with all applicable codes.

	50YQ036		50YQ042		50YQ048		50YQ060
333		375		417		448
		4-0-7/16
		3-6-1/4			2-7-5Z8	3-1-5/8
1-11-5/8		2- 3-5/8
	Side-by-Side Rectangular
1- 7-3/4 1 1-11-3/4				2-3-3/4		2-9-3/4
	15x20		20x20 (2)		20x25		25x25
	20x20				20x20		_2.Ûx25 ^
	20x25		20x25		15x20 (2)		20x20 (2)

Step 3 — Make Ductwork Connections

CONNECT RETURN AND SUPPLY AIR DUCTWORK — Connect ductwork to unit supply and return air duct connections. Refer to Fig. 1 and Table 1 for unit supply and return air connection sizes and locations.

		NtWfTSaX:OFU1«T
		«ïTH «JCT coitwecTfONS.
	«Nfraasc	i
		y-t ■
	?ïEAfîsii«e8?a«(T^	A / ■
	UNIT OUTÏ-iN?-

•JEF^SSBE

		WT» Access &msjs
ooKOT	fMm	i««oei%E»soss«E«T>
mnotutcPimz		^
d47«IS AilES.
mres.		«ievSKNf
t to 3f«as «lowiait <w ssibir«i!iife9
fr««» as(Xi, <S«!«>s.on A «• 4S >o,		<s 3S sncsse«^ 1«
3r«AS where eievsieci f:e«» is f.oi		A w A2

iHmee&'cm B js 3T xiches

2 AJiow a 3'*t service, ctoarahce at frotrt fear anc feit sioe of unit

Fig. 2 — Concrete Pad Dimensions

	iz TOS'«
0C		□ «Sy iSJRSS
<D’=
O'i-	3	3}í(J}fiS£0
!_	re“ fc&5 fíBi

Ajrets íftOfí - li TO f-s COMMt STO { ■POTAL í&6ftMTrTY 2Sf 7035Ÿ >

m.0 FRA«E TO^TtíE».

PAífíT WlTH2l«C-ÍÍ}C» ?*»ÍT(StíSTf«OOP>

F¡g. 3 — Heat Pump Mounting Frame

Flanges are provided on unit for rectangular duct connections. Figure 4 shows a typical duct system with 50YQ installed. Do not operate unit longer than 5 minutes without ductwork. If necessary, refer to Carrier System Design Manual, Part 2, for sys­ tem air duct design. When designing and installing ductwork, consider the following:

a. When connecting ductwork to unit, do not drill holes in area shown below. Coil may be damaged.

b.Install field-supplied filters in return air duct­

work. Recommended sizes for filters are shown in Table I.

c. Avoid abrupt duct size increases and reductions.

■d. Use flexible connectors between ductwork and unit to prevent transmission of vibration. When electric heater is installed, use fireproof canvas

(or similar heat resistant material) connector be­ tween ductwork and unit discharge connection. If flexible duct is used, insert a sheetmetal sleeve inside duct. Design this connector or sleeve so that it extends 24 in. from electric heater element.

e.Size ductwork for cooling air quantity (cfm). The minimum air quantity for proper heating/ cooling operation and electric heater operation is 400 cfm per ARI cooling ton as listed below:

UNIT 50YQ	MIN CFM
024	8 3 3
030	1 0 0 0
036	1 1 8 3
042	1 3 6 6
048	1 6 3 3
060	1 9 3 3

Heater limit switches may trip at air quantities below those recommended.

Insulate and make weatherproof all external ductwork. Insulate and cover with a vapor barrier all ductwork passing thru unconditioned spaces. Follow latest SMACNA (Sheet Metal and Air Conditioning Contractors National Association) and NESCA (National Environ­ mental Systems Contractors Association) mini­ mum installation standards for residential heat­ ing and air conditioning systems.

g.Secure all ducts to building structure. Weather­ proof duct openings in wall or roof according to good construction practices.

"Separate disconnect required for electric heater

> Fig. 4 — Typical Installation — 50YQ

Step 4 — Provide for Cooling Cycle Conden­ sate Disposal — Condensate may be drained directly onto gravel apron or connected by drain line(s) to a dry well. Follow local codes.

CONNECT DRAIN LINE to rubber condensate drain fitting on side of unit (see Fig. 5). Use clamp provided. Install factory-supplied condensate trap (taped to indoor fan compartment for shipment) at end of drain line. If a drain line is not used, connect condensate trap to unit drain fitting as shown in Fig. 5.

CONDENSATE

TRAP (SHIPPING

LOCATION, INSTALL

ON CONDENSATE

DRAIN LINE)

CONDENSATE

DRAIN LINE

¡i DKO LINE POWER

Fig. 5 — Condensate Drain and Trap Details

Step 5 — Make Electrical Connections — In­ stall field wiring in compliance with local and national fire, safety and electrical codes. Be sure

voltage to unit is within ± 10% of voltage indicated on nameplate. On 3-phase units, check that phases are balanced within 2%. Contact local power company for correction of improper line voltage.

Oisrratton «kf tïiïÿi <M3t 3t
wth exijessm phase	¡as
affect waCFaïïty,	coiaM

See Table 2 for recommended wire and fuse sizes.

INSTALL A BRANCH CIRCUIT DISCONNECT PER NEC of adequate size to handle unit starting current. Provide a separate disconnect for unit and for each accessory electric heater circuit as required. (See electrie heater Installation, Start-Up and Service Instructions.) Locate disconnect(s) within sight of and readily accessible from the unit, per Section 440-14 of National Electrical Code (NEC).

ROUTE LINE POWER LEADS INTO UNIT ^ Extend leads from disconnect per NEC thru hole provided (Fig. 1) into line wiring splice box (Fig. 6). Use copper or copper-clad aluminum wire. (Do not make connections with aluminum wire.)

UNIT	CONTROL WIRING	CONTROL WIRING
CONTROL BOX	TERMINAL BOX	CONDUIT,

Fig. 6 — Unit Control Box

CONNECT GROUND LEAD TO GROUND LUG IN SPLICE BOX FOR SAFETY — Connect power wiring. See Fig. 7. Connect line power leads to yellow and black pigtails on single-phase units; yellow, blue and black pigtails on 3-phase units.

SET INDOOR FAN MOTOR SPEED — Refer to page 3 for minimum allowable air quantity for safe electric heater operation. Three-speed indoor fan motor is factory wired for high-speed operation. Fan motor is equipped with spade-type speed selec­ tor terminals marked 1, 2 and 3. For electric heater operation, set motor at: “Low” — sizes 024 thru 042; “High” — size 048; “Med” — size 060.

MOTOR TERMINAL	1	2	3
FAN SPEED	High	Medium	Low

ROUTE CONTROL POWER WIRES (24-v) thru 7/8-in. conduit provided in unit. Fig. 1 and 5. Ex­ tend leads to unit control wiring terminal board in unit control box. Connect leads to terminal board as directed in Fig. 8.

The 50YQ unit transformer supplies 24-v power for complete system including accessory electric heater.

781

i-r'

tv

Table 2 — Unit Electrical Data (60-Hz)

						OPER			COMPRESSOR			IFM		OFM			BRANCH CIRCUIT
						VOLTAGE*												Min Gnd
	MODEL			V/PH											Min	Max			Max Fuse	Min
															Wire			Wire	or HACR
								LRA		RLA	BCSC	FLA		FLA		Ft				Circuit
						Max	Min								Size			Size	Type Ckt»*
																Wire				Amps
															(AWG)t			(AWG)t	Bkr Amps
	50YQ024							66		154	—	2 4		1 3	10	48		}— -1	35	23 0
	50YQ030							72		16 1	—	24		1 3	10	46		10	35	23 8
	^ 50YQ036			230/1		253	207	88		18 2	—	3 6		2 1	10	38		10	45	28 5
	50YQ042							94		21.0	21 2	49		1 9	8	52		10	50	33 3
	50YQ048							106		25 0	27 9	49		2 2	6	71		10	60	42 0
	50YQ060			208/230/1		253	187tt	150		29 2/33 4	35 3	6 4		20	4	43		6	60	52 5
	50YQ042			200/3		220	180	79		146	16 6	49		20	10	55		10	40	27 6
	50YQ048							87		16 9	183	49		2 2	10	48		10	45	30 0
	50YQ036			200/230/3		253	180	87		12 5/11 7	—	3 6		2 1	10	74		10	30	21.3/25 3
	50YQ042			230/3		253	207	GT~		U6	143	49”		i¥~		67		id		24 7
	50YQ048							70		14 8	16 4	4 9		2 2	10	58		10	40	27 6
	50YQ042			460/3		506	414	35		g 3		49		1 9 ‘	14	104		14	15	12 4
	50YQ048							35		7.5	8 8	4 9		2 2	14	90		12	20	14 6
	50YQ042			575/3		632	518	27		49	6 8	49		1 9	14	164		14	15	11 2
	50YQ048							30		60	64	49		2 2	14	141		14	15	10 9
	AWG			American Wire Gage							^Permissible limits of the voltage range at which units will operate
	BCSC		Branch Circuit Selection Current								satisfactorily
	FLA		Full Load Amps								tCopper wire sizes based on 60 C Use copper or copper-clad aluminum wire
	IFM		Indoor Fan Motor								only Use latest NEC for copper-clad aluminum conductor sizing
	LRA		Locked Rotor Amps								^Required when using nonmetallic conduit
	OFM		Outdoor Fan Motor								“Maximum dual element fuse
	RLA		Rated Load Amps								ttMinimum voltage is 197 when outdoor ambient temperature exceeds
	HACR — Heating Air Conditioning & Refrigeration										105 F

ELECTRIC HEATER INSTALLATION — For complete heater installation data, refer to accessory electric heater Installation, Start-Up and Service Instructions.

			GROUND LUG
			(IN SPLICE BOX)
		--GROUND LEAD-
l-PHASE		________________
CONN	Ll			BLK-----------	(
TO
DISCONNECT		________________
PER NEC	L2			-YEL----------	i
			50YQ HEAT PUMP
			GROUND LUG
			(IN SPLICE BOX)
		------ GROUND LEAD-
3-PHASE	LI----------------------------------------------		■ -^-BLK--
CONN
TO	L2-			BLU-----------	i
DISCONNECT
PER NEC
	L3	______________________________ -YPl------------------------		YEL	i
			50YQ HEAT PUMP
_____ Field Wiring		Splice Connections
NOTE Use copper or copper-clad aluminum wire

Fig. 7 — Line Power Connections

START-UP

The 50YQ unit compressors are equipped with crankcase heaters. It is recommended that heater be energized a minimum of 24 hours before starting unit. To energize heater only, set thermostat at OFF posi­ tion; turn on unit main power at disconnect switch.

Heat Anticipator Settings for Room Thermo­ stat — Set anticipator settings for room thermostat according to Table 3. These settings may be changed slightly to provide a greater degree of comfort for a particular installation.

Table 3 — Thermostat Anticipator Setting

		FIRST STAGE	ACCESS.		SECOND STAGE
	UNIT		ELECTRIC
		ANTICIPATOR	HTR (Kw)		ANTICIPATOR
		SETTING			SETTING
			240 V	280 V
					-gg— —
			5 0	3 75
					26
	50YQ024,		7 5	5 6
			100	7 5	26
	030,036,
		Fixed	15 0	11 3	52
	042,048,
			20 0	150	52
	060
			25 0	188	52
			27 0	22 25	78

Accessory Outdoor Thermostat provides adjust­ able outdoor control of accessory electric heaters of 15 Kw and over. This thermostat makes contact when a drop in outdoor temperature occurs. It ener­ gizes a stage of electric heat when the outdoor tem­ perature setting is reached, provided the room thermostat is on the second stage of heating. One outdoor thermostat is recommended for each stage of electric heat after the first stage. Set the outdoor thermostat(s) progressively lower for each stage. Refer to heat load of building and unit capacity to determine the correct outdoor thermostat settings.

The accessory emergency heat relay is required when 2 outdoor thermostats are used. It is auto­ matically energized by the manually operated emer­ gency heat switch in the indoor thermostat subhase. The indoor thermostat locks out compressor and the relay bypasses the outdoor thermostats for electric heater operation during heat pump shutdown. When one outdoor thermostat is used, an emergency heat relay is not required. The emergency heat switch in the indoor thermostat subbase bypasses outdoor thermostat, locks out compressor and acti­ vates electric heater.

184