Carrier 25VNA8 Instruction Manual download pdf (Page 4)

Step 3 — Clearance Requirements

When installing, allow suf ficient space for airflow clearance,

wiring, refrigerant piping, and service. Allow 24 in. (609.6 mm)

clearance to service end of unit and 48 in. (1219.2 mm) (above

unit. For proper airflow, a 6-- in. (152.4 mm) clearance on 1 side of

unit and 12 --in. (304.8 mm) on all remaining sides must be

maintained. Maintain a distance of 24 in. (609.6 mm) between

units. Position so water, snow, or ice from roof or eaves cannot fall

directly on unit.

On rooftop applications, locate unit at least 6 in. (152.4 mm) above

roof surface.

3/8--- in. (9.53 mm) Dia.

Tie---down Knockouts in

Basepan(2) Places

View From Top

A05177

UNIT BASE PAN

Dimension in. (mm)

TIEDOWN KNOCKOUT LOCATIONS in. (mm)

A B C

23 X 23

(596 X 596)

7---13/16 (198) 4---7/16 (102) 18---1/8 (458)

31.2 X 31.2

(792 X 792)

9---1/8 (232) 6---9/16 (167) 24---11/16 (627)

Fig. 3 -- Tie--down Knockout Locations

Step 4 — Operating Ambient

The minimum outdoor operating ambient in cooling mode is 40_F

(4.4_C) with Infinity Touch Control, 55_F (12.8_C) with

non--communicating systems. The maximum outdoor operating

ambient in cooling mode is 115_F (46.1_C). Compressor

protections will prevent cooling mode operation below minimum

ambient temperature range. The system may operate in cooling up

to 125_F(52_C) (52C) with significant reduced capacity cutback

above 115_F (46.1_C). Refer to Product Data “Detailed Cooling

Capacity” table. Low ambient cooling operation is not currently

available. The maximum heating operation ambient is 66_F

(18.9_C). Compressor protections will prevent starting below 10_F

(--12.2_C) and operation below 2_F (-- 16.7_C).

Step 5 — Elevate Unit

Elevate unit per local climate and code requirements to provide

clearance above estimated snowfall level and ensure adequate

drainage of unit.

CAUTION

UNIT OPERATION HAZARD

Failure to follow this caution may result in equipment

damage or improper operation.

Do not allow water and/or ice to build up in base pan.

CAUTION

UNIT OPERATION HAZARD

Failure to follow this caution may result in equipment

damage or improper operation.

Locate the unit in such a way that it is stable in all

circumstances including adverse weather conditions.

Step 6 — Make Piping Connections

WARNING

PERSONAL INJURY AND UNIT DAMAGE

HAZARD

Failure to follow this warning could result in personal injury or

death.

Relieve pressure and recover all refrigerant before system

repair or final unit disposal. Use all service ports and open all

flow --control devices, including solenoid valves.

CAUTION

UNIT DAMAGE HAZARD

Failure to follow this caution may result in equipment

damage or improper operation.

Do not leave system open to atmosphere any longer than

minimum required for installation. POE oil in compressor is

extremely susceptible to moisture absorption. Always keep

ends of tubing sealed during installation.

CAUTION

UNIT DAMAGE HAZARD

Failure to follow this caution may result in equipment

damage or improper operation.

If ANY refrigerant tubing is buried, provide a 6 in. (152.4

mm) vertical rise at service valve. Refrigerant tubing lengths

up to 36 in. (914.4 mm) may be buried without further

special consideration. Do not bury lines longer than 36 in.

(914.4 mm).

Outdoor units may be connected to indoor section using accessory

tubing package or field--supplied refrigerant grade tubing of correct

size and condition. For tubing requirements between 80 -- 100 ft.

(24.38 -- 30.48 m), capacity and performance losses can occur.

Follow the pipe sizing recommendations in the 25VNA8 Product

data to manage these losses. This unit shall not be installed with

greater than 100 ft (30.48 m) of equivalent line length.

Refer to Table 1 for field tubing diameters. No additional

accessories are required for line lengths between 80 -- 100 ft. (24.4

-- 30.5 m) on this product.

Table 1 – Refrigerant Connections and Reco mmended Liquid a nd Vapor Tube Diameters (in.)

UNIT SIZE

LIQUID VAPOR*

Connection

Diameter

Tube

Diameter

Connection

Diameter

Max (Rated)

Diameter

Minimum Tube

Diameter

25VNA824, 25VNA825

3/8 3/8 3/4 7/8 5/8

25VNA836

3/8 3/8 3/4 7/8 5/8

25VNA848

3/8 3/8 7/8 1 --- 1 / 8 3/4

* Units are rated with 25 ft. (7.6 m) of lineset. See Product Data sheet for performance data when using different size and length line sets.

Notes:

1. Do not apply capillary tube indoor coils to these units.

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Carrier 25VNA8 Instruction Manual Page 4

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