Bell Sports PQRY-P72-96TGMU-A installation manual Additional refrigerant charge

9. Additional refrigerant charge

At the time of shipping, the heat source unit is charged with the refrigerant. As this charge does not include the amount needed for extended piping, additional charg- ing for each refrigerant line will be required on site. In order that future servicing may be properly provided, always keep a record of the size and length of each refrigerant line and the amount of additional charge by writing it in the space pro- vided on the heat source unit.

9.1.Calculation of additional refrigerant charge

•Calculate the amount of additional charge based on the length of the piping extension and the size of the refrigerant line.

•Use the table to the below as a guide to calculating the amount of additional charging and charge the system accordingly.

•If the calculation results in a fraction of less than 0.1 kg [4 oz], round up to the next 0.1 kg [4 oz]. For example, if the result of the calculation was 10.62 kg [373.3 oz], round the result up to 10.7 kg [376 oz].

<Additional Charge>

9.2.Precautions concerning piping connec- tion and valve operation

•Conduct piping connection and valve operation accurately.

•Flange type side connecting pipe is assembled in factory before shipment.

1For brazing to the connecting pipe with flange, remove the connecting pipe with flange from the ball valve, and braze it outside of the unit.

2During the time when removing the connecting pipe with flange, remove the seal attached on the rear side of this sheet and paste it onto the flange surface of the ball valve to prevent the entry of dust into the valve.

3The refrigerant circuit is closed with a round, close-packed packing upon shipment to prevent gas leak between flanges. As no operation can be done under this state, be sure to replace the packing with the hollow pack- ing attached at the piping connection.

4 At the mounting of the hollow packing, wipe off dust attached on the flange

sheet surface and the packing. Coat refrigerating machine oil (Ester oil,

ether oil or alkylbenzene [small amount]) onto both surfaces of the pack-

ing.

GB

Additional		High pressure
refrigerant		pipe size
charge	=	Total length of
		ø19.05 [3/4]
(kg) [oz]		(m) ⋅ 0.16 (kg/m)
		(in) ⋅ 1.72(oz/ft)
		High pressure
		pipe size
	+	Total length of
		ø6.35 [1/4]
		(m) ⋅ 0.024 (kg/m)
		(in) ⋅ 0.26 (oz/ft)

High pressure pipe size

+Total length of ø15.88 [5/8]

(m)⋅ 0.11 (kg/m) (in) ⋅ 1.18 (oz/ft)

+α1 + α2

+

High pressure		High pressure
pipe size		pipe size
Total length of	+	Total length of
ø12.7 [1/2]		ø9.52 [3/8]
(m) ⋅ 0.12 (kg/m)		(m) ⋅ 0.06 (kg/m)
(in) ⋅ 1.29 (oz/ft)		(in) ⋅ 0.65 (oz/ft)

[Fig. 9.2.1] (P.3)

AClose-packed packing

B Hollow packing

• After evacuation and refrigerant charge, ensure that the handle is fully open. If

operating with the valve closed, abnormal pressure will be imparted to the

high- or low-pressure side of the refrigerant circuit, giving damage to the com-

pressor, four-way valve, etc.

• Determine the amount of additional refrigerant charge by using the formula,

and charge refrigerant additionally through the service port after completing

piping connection work.

• After completing work, tighten the service port and cap securely not to gener-

<Example 1>
Indoor No. 1: 15	A: ø19.05 [3/4] 40 m [131 ft] a: ø6.35 [1/4]	10 m [32 ft]	At the
No. 2: 72	B: ø9.52 [3/8] 10 m [32 ft] b: ø9.52 [3/8]	5 m [16 ft]
No. 3: 15	c: ø6.35 [1/4]	10 m [32 ft]	conditions
No. 4: 12	d: ø6.35 [1/4]	10 m [32 ft]	below:
No. 5: 24	e: ø9.52 [3/8]	10 m [32 ft]

The total length of each liquid line is as follows: ø19.05 [3/4]: A = 40 m [131ft]

ø9.52 [3/8]: B + b + e = 10 [32] + 5 [16] + 10 [32] = 25 m [80 ft]

ø6.35 [1/4]: a + c + d = 10 [32] + 10 [32] + 10 [32] = 30 m [96 ft]

Therefore, <Calculation example> Additional refrigerant charge

= 40 [131] ⋅ 0.16 [1.72] + 25 [80] ⋅ 0.06 [0.65]

+ 30 [96] ⋅ 0.024 [0.26] + 2.0 [71oz] = 10.7 kg [376oz]

<Example 2>
Indoor No. 1: 08	A: ø19.05 [3/4]	40 m [131 ft] a: ø6.35 [1/4]		10 m [32 ft]
No. 2: 06	B: ø9.52 [3/8]	10 m [32 ft]	b: ø6.35 [1/4]	5 m [16 ft]	At the
No. 3: 12	C: ø12.7 [1/2]	10 m [32 ft]	c: ø6.35 [1/4]	10 m [32 ft]
No. 4: 12	D: ø9.52 [3/8]	10 m [32 ft]	d: ø6.35 [1/4]	10 m [32 ft]	conditions
No. 5: 12			e: ø6.35 [1/4]	10 m [32 ft]	below:
No. 6: 72			f: ø9.52 [3/8]	10 m [32 ft]
No. 7: 06			g: ø6.35 [1/4]	5 m [16 ft]

The total length of each liquid line is as follows: ø19.05 [3/4]: A = 40 m [131 ft]

ø12.7 [1/2]: C = 10 m [32 ft]

ø9.52 [3/8]: B + D + f = 10 [32] + 10 [32] + 10 [32] = 30 m [96 ft]

ø6.35 [1/4]: a + b + c + d + e + g = 10 [32] + 5 [16] + 10 [32] + 10 [32] + 10 [32] + 5 [16] = 50 m [160 ft]

Therefore, <Calculation example> Additional refrigerant charge

=40 [131] ⋅ 0.16 [1.72] + 10 [32] ⋅ 0.12 [1.29] + 30 [96] ⋅ 0.06 [0.65] + 50 [160] ⋅ 0.024 [0.26] + 2.5 [89] + 2.0 [71] = 15.1 kg [531 oz]

Value of	α1
Total capacity of connecting indoor units		α 1
	to Model 30	1.0 kg [36 oz]
	Models 31 to 60	1.5 kg [53 oz]
	Models 61 to 126	2.0 kg [71 oz]
	Models 127 to 180	2.5 kg [89 oz]
Value of	α2
		α 2
	BC controller (standard, main only)	0 kg [0 oz]
BC controller (sub) connected (one)		1.0 kg [36 oz]
BC controller (sub) connected (two)		2.0 kg [71 oz]

ate gas leak.

• Flare machining dimension for systems using R410A is larger than that for

systems using other types of refrigerant in order to increase the air tightness.

• Refer to the table on the below for flare machining dimensions, and follow the

regulations set forth by the local authorities. Seal off the opening of the pipe

with a closure material (not supplied) to keep small animals from entering the

pipe if that is a concern.

flare machining dimension (mm)
	outer diameter	size in inches	dimension A
			R410A
	ø6.35	1/4"	9.1
A	ø9.52	3/8"	13.2
	ø12.70	1/2"	16.6
	ø15.88	5/8"	19.7
	ø19.05	3/4"	24.0
flare nut size (mm)
	outer diameter	size in inches	dimension B
			R410A
	ø6.35	1/4"	17.0
	ø9.52	3/8"	22.0
B	ø12.70	1/2"	26.0
	ø15.88	5/8"	29.0
	ø19.05	3/4"	36.0

[Fig. 9.2.2] (P.3)

<A> [Ball valve (Low press. side/flanged type)]

<B> [Ball valve (High press. side/flared type)]

<C> This figure shows the valve in the fully open state.

AValve stem

[Fully closed at the factory, when connecting the piping, when evacuating, and when charging additional refrigerant. Open fully after the operations above are completed.]

BStopper pin [Prevents the valve stem from turning 90° or more.]

CPacking (Accessory)

[Manufacturer: Nichiasu corporation]

[Type: T/#1991-NF]

DConnecting pipe (Accessory)

[Use packing and securely install this pipe to the valve flange so that gas leakage will not occur. (Tightening torque:40 N·m [400 kg·cm]) Coat both surfaces of the packing with refrigerating machine oil. (Ester oil, ether oil or alkylbenzene [small amount])]

EOpen (Operate slowly)

FCap, copper packing

[Remove the cap and operate the valve stem. Always reinstall the cap after opera- tion is completed. (Valve stem cap tightening torque: 23 ~ 27 N·m [230 ~ 270 kg·cm])]

10