Toshiba MMY-MAP1604HT8ZG-E „ Airtightness test, System restriction, Packed valve details

SMMS-iInstallation Manual

◆System restriction

Outdoor unit combination		Up to 4 units
Total capacity of outdoor units		Up to 48 HP
Indoor unit connection		Up to 48 units
Total capacity of indoor units	H2 ≤ 15m	135% of outdoor units’ capacity
(varies depending on the height difference between
	15m < H2	105% of outdoor units’ capacity
indoor units.)

◆Cautions for installation

•Set the outdoor unit first connected to the bridging pipe to the indoor units as the header unit.

•Install the outdoor units in order of their capacity codes: A (header unit) ≥ B ≥ C ≥ D

•When connecting gas pipes to indoor units, use Y-shaped branching joints to keep pipes level.

•When piping to outdoor units using Outdoor unit connection piping kits, intersect the pipes to the outdoor unit and those to indoor units at a right angle as shown in figure 1 on “6. INSTALLATION OF THE OUTDOOR UNIT”. Do not connect them as in figure 2 on “6. INSTALLATION OF THE OUTDOOR UNIT”.

◆Allowable length and allowable height difference of refrigerant piping

SMMS-i Installation Manual

„Airtightness test

After the refrigerant piping has been finished, execute an airtight test.

For an airtight test, connect a nitrogen gas canister as shown in the figure on the next page and apply pressure.

•Be sure to apply pressure from the service ports of the packed valves (or ball valves) at the liquid side, gas side and balance pipe side.

•An airtight test can only be performed at the service ports at the liquid side, gas side and balance pipe side on header unit.

•Close the valves fully at the gas side, liquid side and balance pipe side. As there is a possibility that the nitrogen gas will enter into the cycle of outdoor units, re-tighten the valve rods at the liquid side and balance pipe side before applying pressure.

(When using MAP140 or MAP160, you do not have to re-tighten the liquid side valve rod as their valves at the liquid side are ball valves.)

•For each refrigerant line, apply pressure gradually in steps at the liquid side, gas side and balance pipe side.

Be sure to apply pressure at the gas side, liquid side, and balance pipe side.

WARNING

Never use oxygen, flammable gases, or noxious gases in an airtight test.

Item		Allowable	Pipes
		value
Total extension of	Less than 34HP or

Connected to indoor unit

Low pressure High pressure

gauge gauge

	pipe (liquid pipe,	Less than 96kW	less	300m	LA + LB + La + Lb + Lc + Ld + L1 + L2 + L3 + L4
					+ L5 + L6 + L7 + a + b + c + d + e + f + g + h + i + j
	real length)	96kW or more	34HP or more	500m
	Farthest piping length L (*1)		Equivalent length	235m	LA + LB + Ld + L1 + L3 + L4 + L5 + L6 + j
			Real length	190m
	Main piping length		Equivalent length	120m (*2)	L1
			Real length	100m (*2)
Pipe length
	Farthest equivalent piping length from the first branch Li			90m (*3)	L3 + L4 + L5 + L6 + j
	(*1)
	Farthest equivalent piping length between outdoor units L0			25m	LA + LB + Ld (LA + Lb, LA + LB + Lc)
	(*1)
	Maximum equivalent piping length of pipes connected to			10m	La, Lb, Lc, Ld
	outdoor units
	Maximum real length of pipes connected to indoor units			30m	a, b, c, d, e, f, g, h, i, j
	Maximum equivalent length between branching sections			50m	L2, L3, L4, L5, L6, L7
			Upper outdoor	70m (*4)	–
	Height between outdoor and indoor		units
Height	units H1		Lower outdoor	40m (*5)	–
			units
difference
	Height between indoor units H2			40m	–
	Height between indoor units H3			5m	–

			Main piping	Gas side valve fully closed
				Header outdoor unit
				Service port
	Packed valve details			Brazed
To gauge manifold		To outdoor unit		Copper pipe
Liquid-side service port			Gas-side valve	Fully
Liquid-side valve				closed
Balance	To			Service port
	outdoor	To
service port
	unit		Gas-side
		outdoor		Liquid valve fully closed
		unit	service port
				Fully
Balance valve	Piping at site
			Piping at site	closed

Piping at site

Service port

Balanced pipe side valve fully closed

V V Gauge

L H manifold

Reducing valve

Copper pipe

Nitrogen gas

*1: Farthest outdoor unit from the first branch: (D), farthest indoor unit: (j)

*2: If the total capacity of outdoor units is 46HP or more, make the equivalent length 70m (real length 50m) or less.

*3: Make the difference 65m or less if the height difference between outdoor and indoor units (H1) is more than 3m.

*4: Make the difference 50m or less if the height difference between indoor units (H2) is more than 3m.

*5: Make the difference 30m or less if the height difference between indoor units (H2) is more than 3m.

Connected to other follower units

Able to detect a serious leakage

1.Apply pressure 0.3MPa (3.0kg/cm²G) for 5 minutes or more.

2.Apply pressure 1.5MPa (15kg/cm²G) for 5 minutes or more.

Available to detect slow leakage

3. Apply pressure 3.73MPa (38kg/cm²G) for approx. 24 hours.

• If there is no pressure decrease after 24 hours, the test is passed.

EN

27-EN – 14 – 28-EN