Motormaster II Head Pressure Controller CPL0WAMB001A00

Motormaster II Head Pressure Controller CPL0WAMB001A00 – Carrier Low Ambient Fan Cycling Kit, 208-230/460V Compatible

Condition: New

The Motormaster II CPL0WAMB001A00 is a low ambient head pressure controller designed by Carrier® to regulate condenser fan operation based on coil temperature, enabling reliable cooling system performance in cold climates. This control module cycles the condenser fan(s) to maintain proper condensing pressure when ambient temperatures drop as low as -20°F (-29°C). It’s compatible with 1.5 to 5-ton rooftop units, providing system stability and performance in conditions that would otherwise hinder refrigerant flow or cause evaporator icing.
This model includes a thermistor sensor, wiring harness, control board, and mounting hardware, and is capable of operating with 208-230V or 460V 3-phase systems. A jumper setting provides an alternate control mode, raising the control range by approximately 20°F to improve system reliability in frosting-prone installations.

Specifications
Manufacturer: Carrier / ICP / Bryant / Payne
Model: CPL0WAMB001A00 (Motormaster II)
Voltage Compatibility: 208–230V and 460V 3-phase
Rated For: 1.5 – 5 ton systems
Minimum Ambient Operation: -20°F (-29°C)
Control Range:
Standard: 70°F to 130°F condenser coil temp
Alternate: 90°F to 150°F (jumper-selectable mode)
Weight: ~7–8 lbs
Mounting Orientation: Vertical (leads at bottom)
Enclosure: Pre-mounted in protective metal housing

Features
Fan cycling based on condenser temperature, not pressure, for precise control
Jumper-adjustable setpoint range – alternate mode raises condensing temp range by ~20°F
Dual voltage transformer – one model supports both standard and high-voltage units
Protects compressor by maintaining optimal head pressure under low ambient conditions
Thermistor-based control – avoids pressure switch failures and wiring complexity
Plug-and-play integration with Carrier rooftop units (single-point or non-single-point systems)
Sensor grease included for accurate thermistor mounting

Applications
Carrier 48/50TC, RAS, RGS, RHS rooftop units
Bryant, Payne, Arcoaire rooftop units (ICP brands)
Commercial buildings, server rooms, telecom shelters, data centers
Cold-climate HVAC where outdoor temps often drop below 50°F
Systems using R-410A or R-22 (verify with unit model)

Compatible HVAC Units
This module is compatible with various Carrier and ICP rooftop platforms including:
Carrier:
48TC04–12, 50TC04–12
RAS/RGS/RHS Series (036–121)
558J, 580J, PAD, PHD, PDS, PDD
Bryant / Arcoaire equivalents (ICP platforms with same chassis and control layout)

Comparable and Related Products
ICM Controls ICM333 – Universal head pressure fan controller
Honeywell W7459A1001 – Low ambient fan cycling controller
Emerson HPS2 – Fan controller for pressure-based systems
Carrier CPLJAMB001A00 – Similar product with slight voltage/control variations
Johnson Controls P66 series – Customizable head pressure cycling controls

Related
Carrier low ambient fan control kit
Head pressure controller for rooftop HVAC
Motormaster II condenser fan control
HVAC fan cycling in cold climate
Rooftop unit condenser fan modulator
CPL0WAMB001A00 replacement kit
Carrier R-410A rooftop accessories
Fan controller for -20°F ambient temperatures

Common Requests
“Will this work with a single-phase unit?”
✅ Yes – though designed for 3-phase, can be adapted to compatible single-phase units.
“Does this include the sensor?”
✅ Yes – thermistor and conductive grease are included in the kit.
“Can I use this with 460V units?”
✅ Yes – dual-voltage support: 208-230V and 460V.
“How do I enable the alternate mode?”
✅ By moving the onboard jumper, the control range shifts 20°F higher to prevent coil frosting.
“Is this a pressure or temperature-based controller?”
❌ Not pressure-based. ✅ This is a temperature-based fan control for better stability and sensor reliability.

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