Crestline Hydronic Specification

Crestline Equipment Schedule / Manufacturer Rating

The leaving water temperature of 130°F exceeds the scheduled 120°F LWT by 10°F. Air-to-water heat pumps are rated at specific entering and leaving conditions — running AWHP-1 at 130°F LWT instead of 120°F significantly reduces capacity and COP. The 20°F delta-T (100°F to 120°F) is the design condition at which the 1,670 MBH capacity was certified. At 130°F LWT, the heat pump must work against a higher condensing temperature, reducing efficiency by roughly 2-3% per degree above rated LWT. The setpoint must be corrected to 120°F.

Crestline Equipment Schedule / NEC Article 430

The pump is connected to the wrong voltage. PHWP-1 is scheduled for 460V/3-phase, not 208V/3-phase. A 460V motor connected to 208V would receive less than half its rated voltage, resulting in severe overheating, drastically reduced torque, and motor burnout within minutes. Per NEC Article 430, the motor branch circuit must match the motor nameplate voltage. The electrician must verify the motor nameplate against the schedule and connect to the correct 460V panel. All four PHWP pumps (1 through 4) are 460V/3-phase at 5 HP.

Crestline Equipment Schedule / NFPA 90A

Fire smoke dampers must be connected to emergency power per the Crestline equipment schedule and NFPA 90A. During a fire, normal power may be lost — if the FSD actuators lose power, they cannot respond to smoke detection signals. While spring-return actuators will fail closed on power loss (a safe condition), the dampers cannot be reopened by the fire alarm system for smoke control sequencing or reset after a false alarm without power. Emergency power ensures the dampers remain controllable throughout the fire event for firefighter smoke management operations.

Crestline Louver Schedule / AMCA 550

This installation is correct. Per the Crestline louver schedule, 1,000 CFM requires a minimum of 2.0 sq ft free area. At this combination, the face velocity is 500 FPM (1,000 CFM / 2.0 sq ft = 500 FPM), which is the maximum recommended velocity for storm-resistant louvers per AMCA 550. The drainable blade design allows rain that enters the louver to drain back outside rather than entering the duct system. The louver size, type, and free area all meet the specification requirements.

Crestline Mechanical Plans

Building 7 requires 4" HWS/HWR risers per the Crestline plans, not 2". As a larger building with 7 floors of radiator units, Building 7 has significantly more connected load than typical residential buildings (which use 2-1/2" risers). A 2" riser serving 7 floors would create excessive velocity, pressure drop, and noise — the radiators on upper floors would be starved of flow while lower floors are over-served. The piping must be replaced with 4" risers as shown on the plans, with proper branch reductions to 1-1/2", 1-1/4", 1", and 3/4" at unit connections.

Crestline Mechanical Plans (project spec exceeds code minimum)

Read against model code alone, 50 CFM intermittent meets the bathroom-exhaust minimum (IMC Table 403.3.1.1 / IRC M1505 set 50 cfm intermittent or 20-25 cfm continuous, with NO distinction between a full and a half bath) — so the contractor's 'meets code minimum' statement is technically true. The verdict fails on the CONTRACT DOCUMENTS, not the IMC: the Crestline mechanical plans specify 100 CFM for a full bathroom with a shower — a project requirement stricter than the code minimum — to handle the extra moisture from showering. Contract specs that exceed code are enforceable, so 50 CFM does not meet the design. The fan must be upsized or the duct run corrected to deliver the specified 100 CFM.