Carrier 30GTN015-035 installation instructions Install Accessories, Refrigerant Circuit

Step 5 — Install Accessories

ELECTRICAL — A number of electrical accessories are available to provide the following optional features (for details, refer to the Controls, Start-Up, Operation, Service, and Troubleshooting book):

•Energy Management Module (used for any of the fol- lowing types of temperature reset, demand limit and ice features):

—4 to 20 mA leaving fluid temperature reset (requires field-supplied 4 to 20 mA generator)

—4 to 20 mA cooling set point reset (requires field- supplied 4 to 20 mA generator)

—Discrete inputs for 2-step demand limit (requires field- supplied dry contacts)

—4 to 20 mA demand limit (requires field-supplied 4 to 20 mA generator)

—Discrete input for Ice Done switch (requires field- supplied dry contacts)

•Chilled fluid flow switch/interlock

•Navigator display:

Provides hand-held, mobile capability using easy to read 4-line display. Keypad function is the same as the Scrolling Marquee module. Features magnet for ‘hands free’ service of components.

HOT GAS BYPASS — Hot gas bypass usually is not rec- ommended because it results in application of equipment out of its normal design application range. However, if its use is required, the appropriate hot gas bypass package may be used. For installation details, refer to separate instructions supplied with the accessory package.

Step 6 — Refrigerant Circuit

LEAK TESTING — Units are shipped with complete op- erating charge of R-22 (see Tables 1A-1B) and should be under sufficient pressure to conduct a leak test. If there is no pressure in the system, use standard refrigeration practices to search for the leak. Repair the leak using good refrigeration practices. After leaks are repaired, system must be evacuated and dehydrated prior to recharging with refrigerant.

DEHYDRATION — Refer to Carrier Standard Service Tech- niques Manual, Chapter 1, Refrigerants, Sections 6 and 7 for details. Do not use compressor to evacuate system.

REFRIGERANT CHARGE (Refer to Table 1A or 1B) — Immediately ahead of filter drier in each circuit is a factory- installed liquid line service valve. Each valve has a 1/4-in. Schrader connection for charging liquid refrigerant.

11