Crestline Equipment Schedule / AHRI 1230

Crestline Electrical Specification (THD ≤ 3%; cf. IEEE 519-2022 Table 2)

The Crestline electrical specification caps total harmonic (voltage) distortion (THD) at the point of common coupling at 3% — stricter than the IEEE 519-2022 Table 2 voltage-distortion limits of 5% (1–69 kV) / 8% (≤1 kV total), where 3% is the individual-harmonic limit. At 4%, the installation exceeds the project's 3% cap. An active harmonic filter or multi-pulse drive configuration is required to bring THD into compliance.

Crestline Electrical Specification (THD ≤ 3%; cf. IEEE 519-2022)

The Crestline electrical specification requires total harmonic (voltage) distortion (THD) at the point of common coupling to remain below 3% — stricter than the IEEE 519-2022 voltage-distortion limits of 5% (1–69 kV) / 8% (≤1 kV total). A 4% THD measurement exceeds the project's 3% cap, indicating insufficient harmonic filtering, which can overheat transformers, trip breakers, and damage sensitive electronics on the same bus.

Crestline Equipment Schedule

This installation is acceptable. The radiator WH-2 is operating near its schedule point at 119°F EWT and 101°F LWT (18°F delta-T) with 0.3 GPM flow. By energy balance, the heat the water gives up is exactly Q = 500 × 0.3 × 18 = 2,700 BTU/hr — that IS the radiator's actual heat output, not a 'theoretical' value. That is about 15% above the 2,339 BTU/hr scheduled output, so the unit is over-delivering slightly versus its design point. The gap is not a heat-transfer-coefficient effect: the coefficient and fin/air-side performance determine what delta-T you GET, but once flow and delta-T are measured the output is fixed by energy conservation. A modest over-delivery like this is normal and acceptable in the field.

Crestline Equipment Schedule / ASHRAE 90.1

The pump is operating at its scheduled design point. PHWP-5 at 165 GPM, 16 ft WG, and 69.7% efficiency matches the equipment schedule exactly. The 3x3x7C designation means 3-inch suction, 3-inch discharge, 7-inch impeller (C trim). The 69.7% efficiency is acceptable for a pump of this size — ASHRAE 90.1 establishes minimum pump efficiency requirements based on flow and head. This pump uses a 3 HP motor at 460V/3-phase, and at 69.7% efficiency the calculated brake horsepower is about 0.96 HP, well within the motor's capacity.

Crestline Equipment Schedule / ASHRAE Handbook

The fill pressure is too high. The schedule specifies 30 PSIG fill pressure, not 50 PSIG. Fill pressure must equal the static pressure at the tank location plus a small margin (typically 5 PSI). At 50 PSIG, the bladder is over-inflated — it will prevent the system from accepting expanded water as it heats up, causing the relief valve to open and dump water. The 30 PSIG fill pressure is calculated based on the building height and system static head at the tank connection point. Always verify the pre-charge with a gauge before filling the system.

Crestline Equipment Schedule / ASME

The expansion tank fill pressure of 30 PSIG matches the equipment schedule specification. The pre-charge pressure must be set above the system static pressure (25 PSIG at tank elevation) to prevent the tank diaphragm from being fully compressed by static head before the system heats up. At 30 PSIG, the tank provides 5 PSI above static to ensure proper expansion volume is available when the system heats from fill temperature to operating temperature. The tank absorbs the volume increase as water expands, preventing the pressure relief valve from opening during normal operation.