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Questions tagged [heat-pump]

The heat-pump is a type of central heating system that extracts heat from the outside, reversing the process used by a central air system.

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Mitsubishi Hyper Heat Models Capacity Weirdness

Why do some of the h2i models not have 100% capacity at 5 degrees like advertised. These models, in fact, don't even list a 5 degree sizing, but drop off at their 17 degree like traditional heat pumps....
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33 views

What is the name for fixed metal venetian blinds?

I am about to build a canopy/enclosure for heat pump outdoor unit to protect it from strong wind and angle rain. It needs to cover the unit all around but still allow free air flow. Ideally the walls ...
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Heat pump pool wiring

Wondering if anyone can help me here. I have a heat pump for my pool. It says min fuse/breaker 50amp and maximum 60amp. So I have a couple options and questions I was hoping someone can help with. ...
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Do recirculation pumps work with water source heat pumps?

Our plumber has installed the recirculation pump but, when it is on we only have tepid water. When we unplug it we have hot water. Just wondering if recirculation pumps are meant to work with heat ...
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Fujitsu Halcyon: Custom Air-Filter (C.F.M.)

I'm trying to make airfilters to fit over my Fujitsu Halcyon Wall Mounted heating & air-conditioning split system. I'm talking about the indoor unit specifically. The wire mesh screens that come ...
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30 views

Heat Strip in Heat Pump

We had a/c here last week to fix a capacitor on our a/c unit and signed up for their maintenance program. They came today to clean everything and do checkup and said the heat strip in our heat pump ...
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Manually Toggling Heatpump Reversing Valve to enable cooling

Background A Radiothermostat CT80 fails to signal heatpump cooling, so jumpering the RED node with the GRN (Fan) and YEL (Cooling) node has successfully enabled cooling. The weather became cold, ...
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35 views

Hook up new thermostat

Top brown picture is my old thermostat white is the new one , do I have it wired correct? On out side unit we have replaced motor, fuses, compassator ,cc contactor ,relay . We have a heat pump. But ...
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Direct Wiring (bypass thermostat) of heatpump cooling

Last September my CT80 radiothermostat would not signal cooling despite the measured temperature exceeding the temperature setpoint. It would be nice if a relative could manually switch the cooling ...
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79 views

Is HVAC device a heat pump?

A Florida HVAC device keeps a bank of storage units frosty in the summer time. A wifi thermostat is desired: a determination has to be made as to whether the device is a heat pump or not. The ...
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34 views

Will coefficient of performance rise in the future for heat pumps?

I can see there are heat pumps with x > 4.1 SCOP, which is great! Q: But will this get better in the future? Ex. in 10 years? New type of heat-pumps? Or are there any psyhical limitations, that ...
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Heatpump Wiring Color Convention

A heatpump thermostat is to be upgraded. I am unsure of: Which color wire is the Common (thought to be BLUE) Where should the brown wire be connected? (B node?) Is the 'B' node in the photo ...
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If my heat pump does not have a neutral, do I still need a neutral wire?

I had a friend wire 10-3 line for a new heat pump. He connected the red and black conductor wires in the house to the 2-pole 60 amp breaker and the neutral white to the neutral bus bar. The outdoor ...
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4answers
71 views

Efficiency of a heat pump water heater during the winter

In my understanding, heat pump water heaters pump energy from the room around the water tank into the water. Clearly, this must be energy efficient in the summer time, especially if I am using AC ...
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1answer
46 views

How can I deal with a heat pump condenser producing lots of water?

Heat pumps was replaced in 2017. North Florida has had moderately cool weather (50-60 degrees F) recently. I noticed water underneath one of the units. Is the water pooling normal? If yes, why? If ...
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Heat pump blower motor cycles on/off after running 140 seconds

Standard Trane split heat pump, condenser outside blower inside. Usually the system will run normally but after 2 min 20 seconds the blower motor will cycle on and off randomly for 20 seconds. Then ...
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4answers
151 views

Best Way to Heat a Ductless Multi-Level Home

I just bought a home and it desperately needs an update to its heating. It currently has baseboard electric resistance heaters in every room. There is no duct-work in the house. We're in cold humid ...
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45 views

Why is my Heat Pump fan not turning in cold weather?

My heat comes on and you can hear the condenser unit come on as well. However the fan is not turning? The outside temp is 30 degrees? Is this normal? Can anyone share some wisdom on this? Thank ...
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Heat pump can't get a zone to 72° F

I have a heating system with both a heat pump and a boiler. The rule for the system is that if the temperature in a zone is 5° F less than called for, then the boiler will come on, but otherwise the ...
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Dual energy controller 2AC02700701 runs heat pump with low fan only

I am running a central heat system that uses a heat pump as stage 1 and a gas furnace as stage 2. The thermostat is not directly connected to the furnace and heat pump motor, instead to goes through a ...
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2answers
67 views

Thermostat White-Rodgers 1F82-261 switches to stage 2 heat for no apparent reason

I am running a central heat system that uses a heat pump as stage 1 and a gas furnace as stage 2. The thermostat used is the White-Rodgers 1F82-261 which supports 2 stages of heat. When using regular ...
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1answer
86 views

Carrier infinity 25vna heat pump utility curtailment

I have a newly installed infinity greenspeed hp system and the utility is trying to figure out how to control the outdoor unit in heating mode. It's my understanding that the utility sends a signal ...
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24 views

AC \ Heatpump radiator corrosion

The example, from another posting, shows radiator corrosion. My heat pump's radiator is so corroded that it is unable to radiate heat and now the heat pump must be replaced. What preventative ...
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26 views

Troubleshooting remote AC (heat pump)

BACKGROUND The system was working well in July: 6AM: AC turns on and reaches target temperature of 77 deg ISSUES Although it is a heatpump in cooling mode, I will refer to the system as an AC for ...
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What performance or efficiency advantages are there in practice for command-modulated inverter heat pumps vs. self-modulated units?

Inverter technology has caught on in the North American heat pump market, with most major HVAC manufacturers offering the feature not only in mini-splits, but in traditional split system ...
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270 views

Generac Generator with Carrier Infinity Heat Pumps

I've signed a contract to install a Generac 22.5 kW whole house generator and transfer switch in our home outside Boston. Our home has Carrier Infinity 3 ton heat pumps installed on the first and ...
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121 views

How can I tell if my new AC is overloading my home electric service?

I just installed a mini-split A/C system. It is 2 outdoor compressor units and 7 indoor head units. (I did 95% of the install myself, toot toot) It was working great, but the weather had been ...
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1answer
65 views

Efficiency of having 2 heat pumps in my house

I have a 2 story house and I want to replace our old window AC. I was initially thinking of replacing it by a single heat pump unit, but in order to get government funding, I would need to get one ...
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26 views

Minisplit Maintenance Issues

I have a Daikin 12kBTUH minisplit heat pump installed in my 1 BR 480 sq ft apartment in North Florida. It heats and cools and is very quiet. Our electric bills average betweeen $45 to $70/mo. ...
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48 views

Help wiring thermostat for heat pump

I'm replacing an old thermostat with a slightly newer thermostat. It's connected to a heat pump and the old wiring (picture attached) was: White = W2 Yellow = Y Brown = O/B Red = R Green = G Blue = C ...
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387 views

How does one set the temperature threshold for heatpump? Carrier Infinity

I've just had a Carrier Infinity heat pump installed, with the matching smart thermostat. The only problem with it is that while it has three settings for the heat source: Heat pump only Electric ...
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1answer
162 views

Coleman 6230-901 outdoor unit fan running slow (and continuously)

I have an old rental mobile and the heat pump is operating normally, except the outdoor unit fan is running all the time (unless the breaker is off), and it runs very slowly. The run capacitor ...
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Heating the cold exhaust on heat pump

I'm honestly kinda surprised that nobody has tried that (at least, my Google Fu failed me in finding someone that did). I just bought my first home and noticed something. My outdoor coil for my heat ...
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4k views

Honeywell RTH6500 WiFi Thermostat wiring questions for a heat pump

I'm trying to install a new Honeywell RTH6500 thermostat on an old heat pump system that has regular plus emergency heat and the closest matching diagram says to put both the white "W2" wire and black ...
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1answer
48 views

After market air filter replacment

I have a Lennox heat pump which has an air handler with a Lennox X7935 Carbon Clean Healthy Climate MERV 16 Filter installed. These filters are like $105 per at least. When we purchased this whole ...
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3answers
573 views

Why don't heat pumps run for a bit BEFORE starting the air circulation fan?

I'd like to think I understand how heat pumps work decently well. My home has one plus electric heat, which I try not to resort to because heat pump is more efficient, if slower. When a traditional ...
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4answers
152 views

Will heat pump heat home faster than space heater?

I know that a heat pump is cheaper to operate than an electric space heater, but I'm wondering if a heat pump will heat our home faster than an electric space heater. I'm asking because I have an ...
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65 views

Must a 4 ton variable speed air handler use a 4 ton heat pump?

This is an air conditioning question: Must a 4 ton variable speed air handler use a 4 ton heat pump or can a 3.5 ton heat pump or smaller size heat pump be used instead?
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86 views

How to bypass this component to a Tetco Heat Pump

I have Tetco Heat Pump system that came with my house when it was purchased. About a year ago, I started hearing a water hammer in my pipes that I traced back to the solenoid(?) in the picture below. ...
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1answer
667 views

Air handler turns on even when set temp is reached

My HVAC is a heat pump system, the air handler inside is a Goodman aspf183016ea. The whole system/house is about 3 years old, and is all electric. I recently moved into the home and noticed that the ...
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1answer
70 views

Bosch Heat Pump + Hydronic Coil?

I was hoping to get some advice on the proper setup for this system. I live in Long Island, NY and just moved into a large house with an extremely old oil burner and 3 a/c condensers. I'm about to ...
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1answer
49 views

Is this humidifier properly installed?

Has anyone seen a humidifier installed this way: humidifier installed to side of air handling unit (hole drilled into side of AHU and discharging humidified air directly into the AHU). Always thought ...
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1answer
88 views

Is there any significant loss of cooling efficiency to wrap the both sunction line and liquid line together using one single insulator?

The installation of a split-type air-conditioner wraps both sunction line and liquid line together using one single insulation, instead of wraping each line separately. Is there any significant loss ...
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2answers
823 views

Should my a/c have some sort of a drip pan (photo)

I've got water (condensation) dripping from this "radiator" in my a/c. It's slanted so MOST of the condensation drips along the radiator and into a drip pan. I'm wondering if I just need to clean it ...
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2answers
103 views

How exactly do heat pumps work in a cold climate?

I don't really get how heat pumps work in a cold climate. In New England where I live, most energy is spent heating the house in the winter. During the winter the outside is ALWAYS colder than the ...
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1answer
203 views

Ductless Mini Split heat pump not cooling / heating outside of room

I have a wall mounted mini split (Fujitsu 9,000 BTU) installed in my bedroom over my bed, intended to heat and cool my upstairs (there has no suitable location in the hallway). It is a standard sized ...
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1answer
67 views

Split System Air Con icing up at night only..?

My Mitsubishi Split System works great all summer but now I find that it heats wonderfully all day but then ices up outside during the night when the temp falls below 0. At -2 it stops altogether and ...
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30 y.o. air pump troubleshooting. Where do I start?

500 sq.ft. apartment, 2nd floor, 32 y.o. through the wall, ducted air heat pump. The pump is installed in a closet next to the apartment (separate entry), and the air ducts spread from there along the ...
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94 views

Is it possible to wire an electric radiant floor as a heat pump in my Nest thermostat?

I have a standard gas furnace, but recently installed an electric radiant floor in one room. I have a transformer at the electric floor and a regular low voltage thermostat wire to my Nest thermostat. ...
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32 views

Heat pump (AC Heater) start cooling once programmed temp is reached?

My AMANA (and another McQuay unit) in wall AC/heat pump unit works fine on cold days. However, I noticed when the room temperature is higher than the programmed temperature the heater starts letting ...