16 IM 962-2
Installation
Refrigerant Charge
Leak Testing
Pressurize line set and coil through service ttings with dry
nitrogen to 150 psig maximum. Leak test all joints using
liquid detergent. If a leak is found, recover pressure and
repair.
WARNING
Do not use oxygen to purge lines or pressure system for leak
test. Oxygen reacts violently with oil, which can cause an
explosion resulting in severe personal injury or death.
Table 12: Basic System Charge*
Unit Charge oz [g]
06F 178 [5046]
07F 242 [6861]
10F 339 [9661]
11F 300 [8505]
12F 378 [10,716]
15F 506 [14,345]
20F 655 [18,569]
Note: *System with 0 Feet of Tubing
Table 13: Required Ounces of R410A Charge per Foot of
Tubing
Tube Size O.D., in [mm] Liquid Tube, oz [g] Vapor, oz [g]
1/2 [12.7] 1.06 [30.0] 0.04 [1.13]
5/8 [15.88] 1.65 [46.7] 0.07 [1.98]
3/4 [19.05] 2.46 [69.7] 0.10 [2.83]
7/8 [22.23] 3.28 [92.9] 0.13 [3.68]
1-1/8 [28.58] — 0.22 [6.23]
1-3/8 [34.93] — 0.34 [9.63]
1-5/8 [41.28] — 0.48 [13.60]
2-1/8 [53.98] — 0.84 [23.81]
Note: Quantities based on 110°F liquid and 45°F vapor
Tools Required for Installing and Servicing
R410A Models
Manifold Sets:
• Up to 800 PSIG High side
• Up to 250 PSIG Low Side
• 550 PSIG Low Side Retard
Manifold Hoses:
• Service Pressure Rating of 800 PSIG
Recovery Cylinders:
• 400 PSIG Pressure Rating
• Dept. of Transportation 4BA400 or BW400
CAUTION
R410A systems operate at higher pressures than R22
systems. Do not use R22 service equipment or components
on R410A equipment
Specication of R410A
Application: R410A is not a drop-in replacement for R22;
equipment designs must accommodate its higher pressures. It
cannot be retrotted into R22 condensing units.
Physical Properties: R410A has an atmospheric boiling point
of 62.9°F and its saturation pressure at 77°F is 224.5 psig.
Composition: R410A is an azeotropic mixture of 50%
by weight diuoromethane (HFC32) and 50% by weight
pentauoroethane (HFC125).
Pressure: The pressure of R410A is approximately 60% (1.6
times) greater than R22. Recovery and recycle equipment,
pumps, hoses and the like need to have design pressure
ratings appropriate for R410A. Manifold sets need to range
up to 800 psig high-side and 250 psig low-side with a 550
psig low-side retard. Hoses need to have a service pressure
rating of 800 psig. Recovery cylinders need to have a 400 psig
service pressure rating. DOT 4BA400 or BW400.
Combustibility: At pressures above 1 atmosphere, mixture
of R410A and air can become combustible. R410A and air
should never be mixed in tanks or supply lines, or be allowed
to accumulate in storage tanks. Leak checking should never
be done with a mixture of R410A and air. Leak checking can
be performed safely with nitrogen or a mixture of FR410A
and nitrogen.
To Next Page
Loading...
Need help?
General
