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2 — 30GT Stub Locations Fig. 3 — 30GT Hot Gas Solenoid Wiring LEGEND COM — Common NC — Normally Closed TC — Temperature Controller HGS — Hot Gas Solenoid NO — Normally Open U1 — Unloader 1 Fig. 4 — 38AKS Hot Gas Bypass Piping INSTALLATION IN 38AKS014-024/INDOOR FAN COIL (CONSTANT VOLUME) SPLIT SYSTEM COMBINATION Step 1 — Install Piping (See Fig. 4) Shut off all power to the unit and remove refrigerant charge using an approved refrigerant recovery device before proceeding with installation. Failure to do so may result for personal injury. IMPORTANT: Do not bury refrigerant piping underground. 1. In applications where the air handler refrigerant distributor is not equipped with a side outlet connection, it is recommended that a Sporlan in-line auxiliary side connector with standard distributor be used. Refer to the installation instructions for the indoor fan coil to obtain nozzle size and distributor connection size. Select the auxiliary side connector based on this information. The side connector must be installed on refrigerant circuit no. 1 (first stage of cooling) of the fan coil being used. LEGEND TXV — Thermostatic Expansion Valve *Pilot valve connects directly to bypass valve per sketch A. 2. Install a field-supplied 1/4 in. NPT to 1/4 in. flare fitting on the gage connection port of the compressor suction service valve. 3. Sweat the pilot solenoid valve supplied in the hot gas accessory package directly to the hot gas bypass valve on the 3/8 in. ODF external equalizer port. 4. Install field-supplied 1/4 in. copper tube (flared with a nut on each end) between the compressor suction valve and the hot gas pilot solenoid valve. 5. Connect a field-supplied 5/8 in. OD copper tube between the discharge line process tube (hot gas stub) and a field- supplied manual shutoff service valve, avoiding any traps in piping. 6. Connect another field-supplied 5/8 in. OD copper tube between the manual shutoff valve outlet and the hot gas bypass valve inlet. 7. Connect a field-supplied 5/8 in. OD copper tube between the leaving side of the hot gas bypass valve and the Sporlan auxiliary side connector (distributor-side connector). 3 Step 2 — Install Control Wiring (See Fig. 5) 1. Install a field-supplied relay with a 24-v coil and normally closed contacts rated for 20 va at 125 vac inductive load. Mount this relay in the 38AKS control box. NOTE: This relay is identified in Fig. 5 as HGR (hot gas relay). 2. For 38AKS014-024: a. Connect a field-supplied wire between TB2-3 and the L1 side of the HGR coil. b. Connect a field-supplied wire between TB2-9 and the L2 side of the HGR coil. c. Connect a field-supplied wire between TB2-2 and HGR-4, one of the normally closed (NC) contacts. d. Connect one leg of the hot gas pilot solenoid valve to HGR-6, the other NC contact. e. Connect the other leg of the hot gas pilot solenoid valve to C2. Step 3 — Restore Refrigerant Charge — Charge unit in accordance with 38AKS Charging Chart found on unit. TC2 TB2 TB2 LLS HGR HGR 3 9 Hot Gas BLU YEL TB2 Pilot Solenoid Valve LEGEND C2 HGR — Hot Gas Relay LLS — Liquid Line Solenoid TB — Terminal Block TC — Thermostat Cooling NOTE: Hot Gas Relay (HGR) use Part No. HN61KK324. Fig. 5 — 38AKS014-024 Hot Gas Bypass Wiring ACCESSORY OPERATION AND ADJUSTMENT Adjustment — The hot gas bypass valve is set to begin opening when the suction pressure falls to approximately 62 psig (427 kPa). The pressure corresponds to a chilled water set point of approximately 44 F (6 C). If the chilled water set point is lower than 44 F (6 C), the bypass setting must be decreased. The opposite is true if the chilled water setting is above 44 F (6 C). Condensing temperature also affects the setting of the bypass valve, and a change may be required. To adjust the setting of the bypass valve, a 5/16 in. hex wrench is required. Remove the cap on the valve, and turn the adjustment nut with the hex wrench. Turning in a clockwise direction increases the setting, and turning in a counterclockwise direction decreases the setting. Operation — The hot gas bypass accessory operates as follows: When a call for cooling is received, the compressor start circuit is energized, along with the hot gas solenoid (HGS) and all unloaders. Once the HGS circuit is completed, the solenoid valve opens allowing the hot gas bypass valve (HGBV) to sense suction pressure and respond accordingly. If the suction pressure is below the HGBP (hot gas bypass) valve setting, the valve begins to open. The valve continues to open until it either reaches an equilibrium or the maximum open position. Discharge gas is bypassed into the mixed-phase line between the expansion valve and the cooler. This condition continues until the suction pressure rises above the HGBP valve setting, a second stage of temperature control is called for, or the unit cycles off. TROUBLESHOOTING PROBLEM PROBABLE CAUSE SOLUTION Hot Gas Bypass Valve Fails to Open. 1. Dirt or foreign material in valve. 2. Equalizer passageway clogged. 3. Ext...
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