Balcar R410A 171, Thermal insulating process, How to install drain up kit, Tightening connection

Tightening connection

Thermal insulating process

3 INSTALLATION PROCEDURE OF DRAIN-UP KIT

How to install drain up kit	2. Hang the temporary hanging hook of the drain up
	kit to the side slit of the indoor unit from inner side.

– 171 –

CAUTION

•Do not apply excessive torque. Otherwise, the nut may crack depending on the conditions.

	(Unit : N•m)
Outer diam. of copper pipe	Tightening torque
6.4 mm (diam.)	14 to 18 (1.4 to 1.8 kgf•m)
9.5 mm (diam.)	33 to 42 (3.3 to 4.2 kgf•m)
12.7 mm (diam.)	50 to 62 (5.0 to 6.2 kgf•m)
15.9 mm (diam.)	68 to 82 (6.8 to 8.2 kgf•m)

•Tightening torque of flare pipe connections

Pressure of R410A is higher than that of R22. (Approx. 1.6 times) Therefore, using a torque wrench, tighten the flare pipe connecting sections which connect the indoor and outdoor units of the specified tightening torque.

Incorrect connections may cause not only a gas leak, but also a trouble of the refrigeration cycle.

Flare at indoor unit side

Flare at outdoor unit side

Align the centers of the connecting pipes and tighten the flare nut as far as possible with your fingers.

Apply thermal insulation to pipes at liquid and gas sides separately.

•Be sure to use thermal insulator with heat resisting temperature 120˚C or more for pipes at gas side.

•Using thermal insulators attached to the indoor unit and Elbow piping kit, apply thermal insulating process surely to pipe connecting section without clearance.

CAUTION

Apply thermal insulating process surely so that no exposure cannot be found up to the end of the pipe connecting section of the indoor unit. (If a part of the pipe is exposed, leakage may be caused.)

Fix with vinyl tape. Set the notch upward.

Elbow piping kit side

Attached thermal insulating pipe

For the connection of refrigerant pipe and thermal insulating process after hanging down the indoor unit, refer to the Installation Manual attached to the indoor unit.

1.Mount the drain up kit fixture to the rear side inside of the indoor unit. (1 screw)

Screwing of drain up kit fixture

Drain up kit fixture

Screw the drain up kit to the indoor unit.

(3 screws: Ceiling surface, side face, and drain up kit fixture)

Side slit of indoor unit

Hang temporary hanging hook from inside of indoor unit.

Temporary hanging hook of drain up kit

Drain up kit

Screwing	Drain up kit	Screwing
(To side face)		(To Drain up kit fixture)

Then tighten the nut with a spanner and torque wrench as shown in the figure.

Half union	Flare nut
Externally	Internally
threaded side	threaded side
Use a wrench to secure.	Use a torque wrench to tighten.

Screwing (To Ceiling surface)

TCB-DP22CE