Stat Location | hussman IGSS-FMSS-0301 instruction

IGSS-FMSS-0301

Refrigeration

REFRIGERANT TYPE

The standard refrigerant will be R-404 unless otherwise specified on the customer order. Check the serial plate on the case for information.

Piping for more than one case on a condensing unit is run underground with either common suction and liquid lines from the machine room or individual suction and liquid lines joined together in the machine room.

REFRIGERATION LINES

LIQUID SUCTION

3/8" O.D.

5/8" O.D.

NOTE: The standard coil is piped at 5/8" (suction); however, the store tie-in may vary depending on the number of coils and the draw the case has. Depending on the case setup, the connecting point in the store may be

5/8", 7/8", or 11/8". Refer to the particular case you are hooking up.

Refrigerant lines should be sized as shown on the refrig- eration legend furnished by the store.

Install P-traps (oil traps) at the base of all suction line ver- tical risers.

Pressure drop can rob the system of capacity.To keep the pressure drop to a minimum, keep refrigerant line run as short as possible, using the minimum number of elbows. Where elbows are required, use long radius elbows only.

For refrigerators with KOOLGAS defrost, suction, and liquid lines should not contact each other and should be insulated for a minimum of 30' from the refrigera- tor. Additional insulation for the balance of liquid and suction lines is recommended and required wherever condensation and dripping would be objectionable.

CONTROL SETTINGS-Remote

See the “Case Specs” section of this guidebook for the appropriate settings for your merchandiser. Maintain these parameters to achieve near constant product tempera- tures. Product temperature should be measured first thing in the morning, after having been refrigerated overnight. Defrost times should as directed in the Case Specifica- tions section of this guide.The number of defrosts per day should never change. The duration of the defrost cycle may be adjusted to meet conditions present at your loca- tion.

CONTROL SETTINGS-Self Contained

On Self Contained cases all functions, defroat, fans, tem- perature are controlled by Pagon ERC-2 controller. See case spects for proper temperature and defrost settings.

ACCESS TO TX VALVES & DRAIN LINES

MECHANICAL - Remove product from end of case. Remove product racks. Remove refrigeration and drain access panels (labeled).TX valve (mechanical only) and drain are located under each access panel at end of the case.

ELECTRONIC - The Electronic Expansion valve master and slave cylinder(s) are located within the electrical access panel(s).

ELECTRONIC EXPANSION VALVE (OPTIONAL)

A wide variety of electronic expansion valves and case controllers can be utilized. Please refer to EEV and con- troller manufacturers information sheet. Sensors for elec- tronic expansion valves will be installed on the coil inlet, coil outlet, and in the discharge air. (Some supermarkets require a 4th sensor in the return air). Case controllers will be located in the electrical raceway or under the case

THERMOSTATIC EXPANSION VALVE LOCATION

This device is located on the same side as the refrigera- tion stub. A balanced port expansion valve model is fur- nished as standard equipment.

EXPANSION VALVE ADJUSTMENT

Expansion valves must be adjusted to fully feed the evapo- rator. Before attempting any adjustments, make sure the evaporator is either clear or very lightly covered with frost, and that the fixture is within 10°F of its expected operat- ing temperature.

MEASURING THE OPERATING SUPERHEAT

1.Determine the suction pressure with an accurate pressure gauge at the evaporator outlet.

2.From a refrigerant pressure temperature chart, determine the saturation temperature at the observed suction pressure.

3.Measure the temperature of the suction gas at the thermostatic remote bulb location.

4.Subtract the saturation temperature obtained in step No.2 from the temperature measured in step No.3.

3. The difference is superheat.

5. Set the superheat for 5°F - 7°F.

T-STAT LOCATION

Thermostats are located within the electrical raceway.The raceway location is dependent on the style of the front

IGSS-FMSS-0301 specifications

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hussman IGSS-FMSS-0301 manual Stat Location

Models: IGSS-FMSS-0301