Refrigeration - Remote Models; Refrigerant Piping; Line Sizing; Piping Insulation - Hussmann DDS Installation And Service Instructions Manual

07/02/03 Page 6
SECTION 4

REFRIGERATION - REMOTE MODELS

REFRIGERANT PIPING

Refrigerant line connection sizes: All models LIQUID LINE 3/8" OD
SUCTION LINE 5/8" OD for 4' & 6' Models; 1 1/8" for all other models
These connections are made at the right hand end of the cases (facing front) beneath the
refrigerated display area. Refrigerant lines should be sized as shown on the refrigeration legend
(furnished by the owner). If a legend has not been furnished, refer to Section 12 of the
Hussmann Application Engineering Manual for guidance.
OUTLET LOCATION
The refrigerant line outlet is located at the right hand end of the refrigerator beneath the display
pans. After connections have been made, seal this outlet thoroughly both on the inside and the
outside. An aerosol dispensed urethane type of insulation is recommended.

LINE SIZING

Refrigerant lines should be sized as shown on the refrigeration legend prepared for the store and
as (furnished by the owner). If a legend has not been furnished, refer to Section 12 of the
Hussmann Application Engineering Manual for guidance.
OIL TRAPS
P-traps (oil traps) must be installed at the base of all suction line vertical risers.
PRESSURE DROP
Pressure drop reduces capacity of the refrigeration system. To minimize pressure drop, use
proper size tubing, keep the refrigerant line runs as short as possible and use a minimum number
of elbows. Where elbows are needed, use long radius elbows only.

PIPING INSULATION

For refrigerators with other than KOOLGAS defrost, the suction and liquid lines should be
clamped and/or taped together and insulated for a minimum of 30 feet from the refrigerator.
Refrigerators with KOOLGAS defrost should not have their liquid and suction lines in contact
with each other but are to be separately insulated for a minimum of 30 feet from the refrigerator.
Additional insulation for the balance of the refrigerant lines is recommended and required
wherever condensation and dripping would be objectionable.
HUSSMANN - GLOVERSVILLE