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13.3 Refrigerant piping installation • Tools used in services
13.3.1 Required Tools
R32 refrigerant heat pump use the common parts as R410A heat pump for two-way valves and three-way valves
(diameters of service ports); thus, they maintain commonality in the maintenance of the compressive strength, the
size of pipe flaring, and the size of flare nuts as R410A. Therefore, for refrigerant pipe installation and services, you
can use tools for R410A.
However, mixing of refrigerants is not allowed, so that you have to separate the cylinders for the recovery of
refrigerants.
Tools used for installation •
relocation •
replacement of heat pump units
Works
R32
R410A
R22
Flaring
Flare tools for R410A (clutch type)
Flare tools for R22 (clutch type)
Connection of pipes
Torque wrench (diameter 1/4 3/8)
Torque wrench (diameter 1/2 5/8) *1
Toque wrench (diameter 1/2 5/8)
Manifold gauge charging hose
R32 & R410A Common (As at November 2013)
R22 Only
Air purging
Vacuum pump + Reducer / expander
Vacuum pump
Gas leakage test
Detection liquid or soup water, HFC detector
*1. Nut diameters of 1/2 5/8, the size of torque wrench common with R410A
For other installation, you can use general tools such as screw drivers (+, -), metal saws, electric drills, long-nose
pliers, hole core drills (ø70 or ø65), linen tape, levels, temperature gauges, clamp meters, electric knives, nippers,
pipe cutters, reamers or scrapers, spring benders, (diameters 1/4 3/8 1/2 5/8), monkey wrenches, fixing wrenches
(17 or 12 mm), feeler gauges, hexagon wrenches (4 mm), testers, megohm testers, etc.
Tools used for services
Works
R32
R410A
R22
Insertion of refrigerant
Digital scale for refrigerant charging, refrigerant cylinders, cylinder adopters and packing *a
Recovery of refrigerant
Refrigerant recovery devices, refrigerant cylinders, manifold gauges, charging hoses *b
*a. Use cylinder for each refrigerant, cylinder adopter and packing.
*b. Use refrigerant recovery cylinder separately for each refrigerant
(no mixture of refrigerant allowed)
. Please be
aware that there are some refrigerant collection devices which do not have self-certification.
13.3.2 Tools for R32 (common with R410A)
1. Flare gauges
Use flare gauges when you perform flaring with flare
tools (crutch type). Flare gauges are used to set the
pipe ends at 0.5 ~ 1.5 mm from clump bars of flare
tools.
Flare gauges
2. Flare tools (clutch type)
Flare tools have larger holes of clump bars in order
to set the pipe end at 0 ~ 0.5 mm, and have stronger
springs inside to ensure solid flaring torques. These
flare tools can be used commonly for R22.
Flare tools (clutch type)
