Description

The CTK-2 is an HVAC control from MRCOOL stocked by Buy Comfort Direct — full listing: MRCOOL Condensate Trap Kit with Overflow Switch – CTK-2. This page covers what it is, where it fits in a system, what to check before you order, and how it ships.

About the CTK-2

Where the CTK-2 fits

Controls decide how the equipment behaves: thermostats and zoning panels call for heating and cooling, and safety devices such as float switches and condensate pumps stop water damage before it starts. The CTK-2 has to match the equipment it is wired to — stages, heat-pump reversing valve, common wire and voltage all matter.

Modern controls do more than switch a relay: staging, dehumidification calls, fan profiles, dual-fuel changeover and remote access all live in the thermostat or panel. Matching the control to the equipment’s capabilities unlocks features that are otherwise wasted.

Background reading: the U.S. Department of Energy maintenance guide.

What to check before you order

• Compatibility: single or multi-stage, heat pump (O/B), dual-fuel, communicating versus conventional.
• Wiring: 24 V common wire availability, or line-voltage rating where applicable.
• Placement: float switches in the primary drain pan or secondary line; pumps sized for lift.

Installation and service notes

Kill power at the breaker before wiring low-voltage controls, label every conductor, and confirm the common wire before relying on a powered thermostat. Zoning panels and dual-fuel controls need the equipment’s stage and fan settings configured to match, so keep the equipment manual next to the control manual during setup.

Why buy the CTK-2 from Buy Comfort Direct

We are a stocking HVAC distributor — not a marketplace reseller. Orders over $99 ship free, and financing is available at checkout through Affirm. If you are not sure this is the right part, call (877) 843-4822 before you order and we will match it to your equipment. Browse the rest of our Accessories, and see what customers say on our reviews page.

Ordering and delivery

In-stock items ship in 1–2 business days. Orders over $99 ship free; large equipment travels by freight carrier and parts by ground, and you will get tracking by email when it leaves. Need it matched to a system, or need a quantity that is not on the shelf? Use the contact page or call (877) 843-4822 and we will confirm availability before you pay.

CTK-2 FAQ

Will this work with my system?

Send us the equipment model numbers and we will confirm before you order.

Does the CTK-2 ship free?

Yes on orders over $99 — most orders that include it qualify. Large equipment ships by freight carrier; parts ship by ground.

How do I know it matches my equipment?

Send us your equipment model number through our contact page or call (877) 843-4822. We check the pairing before it ships.