McQuay ACZ 045A, Инструкция по установке, эксплуатации и обслуживанию, Страница: 17 / 104

IOMM ACZ/AGZ-1 17
Where rises in liquid lines result in a 0.5 psi loss per foot of lift, a drop in the liquid line results in a rise
in the refrigerant pressure. A substantial drop in the liquid line can assure the existence of pure liquid
at the valve. If it is a substantial increase because of a large drop, the expansion valve selection must
be re-checked to confirm that the valve to be used is not radically oversized.
Liquid Lines from Condensers to Receivers
Receivers in a refrigerant system have both liquid and gas contained within the same vessel. In air-
cooled condenser applications, the condensing temperature can change rapidly resulting in the
requirement for more liquid at a lower temperature and pressure to be introduced into the receiver.
In order for this flow of lower temperature and pressure refrigerant to enter the receiver:
1) The receiver must be located below the condenser outlet with no restrictions in the line.
2) The liquid line connecting the condenser and the receiver must be sized for a maximum velocity of
100 fpm. Piping sizes for this are shown in the ASHRAE tables.
Note: If the interconnecting piping described above contains a Seasontrol type head pressure
control valve representing a restriction in the liquid line, a separate vent from the top of the
receiver to the discharge line entering the condenser is required.
Liquid Line Components
To assist in laying out and specifying split systems, the following recommended (or equal)
components can be used.
Table 7, Liquid Line Components
Sporlan Part Number Shown - (Equivalents Are Acceptable)
Unit
Model
Circuit
Nom.R-22
Tons
(mbh)
Filter
Drier
Solenoid
Valve
Sight
Glass Expansion
Valve
Unit Conn.
In/Out
ACZ030A Circuit #1&#2 15.9 (191) C-487 E19S270 SA-17S OVE-20 7/8-1-3/8
ACZ035A Circuit #1 15.9 (191) C-487 E19S270 SA-17S OVE-20 7/8-1-3/8
Circuit #2 19.1 (229) C-487 E19S270 SA-17S OVE-20 7/8-1-3/8
ACZ040A Circuit #1&#2 19.2 (230) C-487 E19S270 SA-17S OVE-20 7/8-1-3/8
ACZ045A Circuit #1&#2 21.8 (262) C-487 E19S270 SA-17S OVE-20 7/8-1-3/8
ACZ050A Circuit #1 22.1 (265) C-487 E19S270 SA-17S OVE-20 7/8-1-3/8
Circuit #2 26.8 (322) C-967 E19S270 SA-17S OVE-30 7/8-1-3/8
ACZ055A Circuit #1&#2 26.8 (322) C-967 E19S270 SA-17S OVE-30 7/8-1-3/8