Prevailing good refrigeration practices should be employed for piping supports, leak testing, evacuation,
dehydration and charging of the refrigeration circuits. The refrigeration piping should be isolated from
the building by the use of vibration-isolating supports. Use a soft, flexible material to pack around the
tubes when sealing openings in walls to prevent tube damage and to reduce vibration transmission.
Before connecting units together with field-fabricated piping, check for leaks and dehydrate the field
piping as follows:
1. Pressurize the field piping to 150 psig (1034 kPa) using dry nitrogen with a trace of refrigerant.
Check system for leaks with a suitable leak detector.
2. After completion of leak testing, release the test pressure (per local code) and triple evacuate
the field piping to 500 microns or lower, breaking the vacuum between the first two
evacuations with dry nitrogen.
3. After the third evacuation, verify 500 microns is maintained for at least one minute after the
piping is isolated from the vacuum pump by a shutoff valve.
Field piping is now ready to be installed between evaporator and condensing units.
Model Numbers R-407C Charge Coupling Size
60 Hz 50 Hz lb-oz (kg) Liquid Suction
95°F (35°C) Standard Sound
PFH014A-_L7 —
8-6 (3.80) #6 #11PFH020A-_L7 —
PFH027A-_L7 —
PFH037A-_L7 PFH036A-_L7
13-5 (6.04) #6 #11
PFH042A-_L7 PFH041A-_L7
PFH067A-_L7 PFH066A-_L7 26-10 (12.08) #10 #12
PFH096A-_L7 PFH095A-_L7
3-ton Circuit 3-ton Circuit 22-9 (10.23) #6 #11
5-Ton Circuit 5-Ton Circuit 36-5 (16.47) #10 #12
105°F (41°C) High Ambient
PFH027A-_H7 — 13-5 (6.04) #6 #11
PFH037A-_H7 PFH036A-_H7
26-10 (12.08) #6 #11
PFH042A-_H7 PFH041A-_H7
PFH067A-_H7 PFH066A-_H7 51-11 (23.45) #10 #12
Quiet-Line
PFHZ27A-_L7 — 13-5 (6.04) #6 #11
PFHZ37A-_L7 PFHZ36A-_L7
26-10 (12.08) #6 #11
PFHZ42A-_L7 PFHZ41A-_L7
PFHZ67A-_L7 PFHZ66A-_L7 51-11 (23.45) #10 #12
Table 2.8 Liebert® PFH unit charge levels and coupling size
Vertiv | Liebert PFH Installer/User Guide | 18
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