Mitsubishi Electric Ecodan PUZ-WM85VAA + FTC6

Compatibility

Direct Edge integration has not been established

Mitsubishi's exact outdoor-unit product sheet and FTC6 compatibility matrix identify the paired equipment. The FTC6 installation manual documents meter-pulse and Smart Grid Ready contact inputs, but the consulted sources provide no firmware-matched third-party data interface or Edge integration contract.

Confirm the installed PUZ-WM85VAA nameplate, its FTC6 PAC-IF072B-E controller revision, cylinder/hydrobox arrangement, meter coverage and existing controls. PUZ-WM85YAA and -BS variants need their own identity and wiring review. Do not treat FTC6 input terminals or MELCloud access as a native Edge read or dispatch path.

Models

Specifications

Mitsubishi's product sheet identifies PUZ-WM85VAA(-BS) as a single-phase R32 monobloc with 8.5 kW heating capacity at A-7/W35. This is an outdoor-unit specification at a defined test condition, not a whole-system output guarantee.¹

Exact outdoor unit

PUZ-WM85VAA; verify any -BS suffix on the installed nameplate¹

Declared heating point

8.5 kW at A-7/W35; 3.27 kW power input; COP 2.60 at that point¹

FTC6 pairing

PAC-IF072B-E controller compatibility matrix includes PUZ-WM85(V/Y)AA(-BS)²

Meter inputs

IN8/IN9 electricity pulses; IN10 heat-meter pulses, subject to commissioned meter and controller settings^2, 3

Grid-signal inputs

IN11/IN12 contact combinations; external control design and installer approval required³

Interface

Documented measurements and integration boundaries for Ecodan PUZ-WM85VAA + FTC6.

• The exact FTC6 manual names IN8 and IN9 for electricity-meter pulses and IN10 for heat-meter pulses. Confirm meter pulse weight, coverage and polarity with the installer; these inputs do not expose a third-party telemetry endpoint by themselves.
• IN11 and IN12 encode four Smart Grid Ready states. The manual documents open/short combinations for normal operation, switch-on recommendation, switch-off and switch-on commands during heating or DHW operation. These are control inputs, not a general VPP API.
• To calculate site COP or seasonal performance, measure delivered thermal energy and all included electrical loads over matching intervals. The manufacturer's A-7/W35 product COP is a specified test point, not a measured site result.
• MELCloud is a Mitsubishi service described in the product information. The consulted documents do not establish a local read API, register map or authorized Edge control path through it.

Setup

1. Identify the installed pair

   Photograph the PUZ-WM85VAA outdoor nameplate and confirm PAC-IF072B-E board/controller identity, firmware and attached hydrobox or tank. Record whether the -BS suffix applies.

2. Define the measurement boundary

   Specify independent thermal and electrical meters with matching time intervals. Include pumps, backup heaters and any other relevant electrical loads explicitly; choose a meter pulse weight and document what each FTC6 input receives.

3. Separate inputs from telemetry

   Confirm whether meter pulses are only consumed by FTC6 or also available to an approved monitoring system. Do not assume the controller exposes these totals through Modbus, MELCloud or Edge.

4. Review flexibility with the installer

   If SG Ready or demand response is required, obtain Mitsubishi-approved wiring, safe operating limits, frost/DHW priorities, local override and a project-specific commissioning plan. Keep remote dispatch out of scope until that contract is verified.

Common questions

Can EpiSensor Edge read PUZ-WM85VAA directly over Modbus?

The consulted Mitsubishi sources do not document a direct Modbus server or an exact Edge integration for this pairing. FTC6 meter and SG Ready terminals are inputs to the controller. Request a firmware-matched manufacturer interface contract before proposing direct reads.^2, 3

What do the FTC6 IN8, IN9 and IN10 terminals do?

They accept pulses from up to two electrical meters and a heat meter. The installer must specify the meter boundary and pulse setting; a terminal listing does not prove an external telemetry feed or system-wide COP.³

Does Smart Grid Ready make this a VPP-dispatchable heat pump?

No. FTC6 documents four contact-input states for heating and DHW operation, but a VPP needs an approved controller interface, safe scheduling rules, fallback, consent and measured response. This guide does not authorize remote switching or setpoint writes.³