York K4EU120A50A, K5EU090A50A installation instructions Installing Refrigerant Mains

550.39-N4YI

Table 2 - PHYSICAL DATA

	Model	KEU090	KEU120
	Rows Deep	3	3
	Rows High	27	32
Evaporator Coil	Finned Length (in./mm)	46 / 1168	46 / 1168
	Fin/Inch	13	13
	Tube O.D. (in./mm)	38 / 9.5	38 / 9.5
	Face Area (Ft.2/m2)	8.6 / 0.80	10.2 / 0.95
Centrifugal Blower	inches	15 x15	15 x 15
	Wheel Dia. x Width	381 x 381	381 x 381
	mm
Blower Motor*	Nominal Rating (HP/kW)	112 / 1.12	2 / 1.5
	inches	16 x 25 x 1	16 x 25 x 1
Filters	Size	406 x 635 x 25	406 x 635 x 25
(4 Req'd)	mm
	Face Area (Ft.2/m2)	11.1 / 1.03	11.1 / 1.03
Weight (Lbs,/kg)	Operating	325 / 147	330 / 150
	10 kW	63 / 28.6	63 / 28.6
	16kW	66 / 30	66 / 30
	Electric Heaters	71 / 32	71 / 32
	26 kW
Accessory Weights(Lbs/kg)	36 kW	74 / 33.6	74 / 33.6
	Supply Air Plenum	102 / 46	102 / 46
	Base	60 / 27	60 / 27
	Return Air Grille	15 / 6.8	15 / 6.8
	Hot Water Coil	105 / 48	117 / 53

*All of these 1450 RPM motors have a solid base, a 56 frame, inherent protection and permanently lubricated ball bearings. Refer to Table 7 for additional motor and drive data.

NOTE: Refer to the appropriate condensing unit installation instruction for charging data.

REFRIGERANT MAINS

Many service problems can be avoided by taking adequate pre- cautions to provide an internally clean and dry system, and by us- ing procedures and materials that conform with established standards.

Hard drawn copper tubing should be used where no apprecia- ble amount of bending around pipes or other obstructions in necessary. Use long radius ells wherever possible. If soft cop- per is used, care should be taken to avoid sharp bends which may cause a restriction.

Pack fiber glass insulation and a sealing material such as Per- magum around refrigerant lines where they penetrate a wall to reduce vibration and to retain some flexibility.

Support all refrigerant lines at minimum intervals (8 ft./2.4m) with suitable hangers, brackets or clamps.

Braze all copper to copper joints witH Sil-Fos 5 or equivalent brazing material. Do not use soft solder.

Never braze or solder liquid and suction lines together. The complete suction line should be insulated with no less the 12" (12mm) ARMAFLEX or equivalent. If the liquid line is installed in warm space, it must be insulated.

If it is desirable to tape or wire the liquid and suction lines to- gether for support purposes, they must be completely insulated from each other.

INSTALLING REFRIGERANT MAINS

The units are evacuated and dehydrated at the factory and shipped with a holding charge (1 lb./2.2kg) of Refrigerant-22. The suction and liquid connections are sealed with copper disks.

WARNING: Provisions for recovering refrigerant releases must be available during all phases of installation, leak testing and charging. Do NOT release refrig- erant into the atmosphere. A Schrader valve is pro- vided for refrigerant recovery.

If the unit has already lost its holding charge, it should be leak tested and the necessary repairs should be made. If the unit has maintained its holding charge, you can assume that it has no leaks and proceed with the installation.

Make sure the refrigerant in the lines has been recovered, then drill a small hole through the discs to prevent any internal pres- sure from blowing them off and to allow the flow of dry nitrogen through the connections when unbrazing the closures.

NOTE: To minimize the possibility of system failure due to dirt and moisture, a filter-drier must be installed in each liquid line as close to the evaporator as possible. Filter-driers are not supplied with the evaporator blow- ers. They are supplied with the matching condensing sections.

The temperature required to make or break a brazed joint is sufficiently high to cause oxidation of the copper unless an inert atmosphere is provide.

CAUTION: Dry nitrogen should flow through a brazed joint at all times when heat is being applied and until the joint has cooled.

The liquid, suction and drain connections inside the unit must be piped to the outside. Refer to Unit Dimensions for locations and dimensions of these connection.

Unitary Products Group 5