Unit BP

PolycoldTM Unit Balance Pressure Chart (dataTable) Acceptable Balance Pressures for PolycoldTM Units

(This reference table covers all known Polycold models)

Polycold Unit Balance Pressure (psig) Balance Pressure (bar)
P-20 75-90 (STEVE) 5.2-6.2
P-50 S 120-135 8.3-9.3
P-50 LT 113-128 7.8-8.8
P-75, P-100 105-120 7.2-8.3
PFC-100 110-125 7.6-8.6
PGC-100 112-132 7.7-9.1
PGC-150 105-120 7.2-8.3
PGC-152 140-160 9.6-11.0
PGCL-1 (1XCL) 140-160 9.6-11.0
PGCL-2 (2XCL) 165-190 11.4-13.1
200, 400 115-125 7.9-8.6
330, 331, 340 130-140 9.0-9.7
500 100-115 6.9-7.9
550 110-125 7.6-8.6
550 LT 110-130 7.6-9.0
551 139-152 9.6-10.5
552 135-155 9.3-10.7
650 100-115 6.9-7.9
660 140-175 9.7-12.1
661 155-175 10.7-12.1
662 160-190 11.0-13.1
670 140-175 9.7-12.1
672 160-190 11.0-13.1
1100 160-200 11.0-13.8
1100 LT 155-170 10.7-11.7
1101 165-185 11.4-12.8
1101 LT 150-170 10.3-11.7
1102 175-200 12.1-13.8

If a prefix is not listed under the Polycold Unit number,
then it can be assumed that it applies to either "P" or "PFC" style units.

True balance pressure readings require unit shutdown for a minimum of 48 hours.

How Best to Interpret Unit Balance Pressure Data

The information provided in the table above, is for purposes of determining if a unit is in need of a top-off charge, and/or if a refrigerant leak has occured. We provide Top-Off Charges for many of the units listed.

It is not advisable (or legal) to add additional refrigerant to a unit without first fixing any leaks that may be present.

If you need to top-off a unit more then 3 times, or if more then 40% of the charge is missing, it is highly recommended that the unit be completely recharged from a new pre-mix refrigerant charge. Failure to adhere to this recommendation could present a danger to the safe operation, and longevity of the Polycold unit.

Additional Note:

For small units (P-75, P-100, PGC-150, ect.), if a refrigerant recovery unit is used to transfer a full refrigerant charge into the unit, it is not unusual to exceed the top-of-range balance pressure by as much as 20-25 psi (1.4-1.7 bar). This pressure will drop into a more reasonable range within 24 hours, once the refrigerant has had a chance to soak into the compressor's oil. In most cases this means using the entire pre-mix charge, even though the balance pressure may seem high at first.

Larger units will experience a similar drop in pressure, but not to the same extent as the smaller units do. As an example; A PFC-1100HC unit will typically be at 205-210 psi (14.1-14.5 bar) just after it is charged. By the next day, the pressure will have dropped into the 185-190 psi range (12.8-13.1 bar).

So although it may be tempting to want to reduce the pressure of a freshly charged unit to better fit into the range specified in the table above, it is always best to wait for at least one to two days before making this decision.