HVAC

Cooling

Lounge

A new window AC was installed July 2014

Shop

There is a heat pump / air handler cooling system mounted on the ceiling and roof.

These are some very vague and poorly collated notes about that:

heat pump stat - but we aren't using the heat pump for heating, so we don't even need the fancy board since it's for defrost. we use it when we're cooling only. Right now, the wire from the roof is wired to make it so when power is on (7,9,11) PP1-1 - it runs all the time. There is no relay control of it that's active. the red wire in the control wire will throw a relay on and off to control the heat pump.

but, we don't need to use the heat mode of the unit and it's not wired upstairs for it at the moment, so we should set up the filtrete like so -

take off silver jumper, use RC and Y. (normal cooling, not heat pump cooling - the transformer is ganged right to the relay up top). thin red wire on the transformer goes to RC thick red wire from the roof goes to Y blue and white should be stuck together like they are.

we also need to put the air handler/fan unit on the coil that hangs down (big tan thing) run always if the heat pump is on, since it will ice up otherwise. However, it's also useful when things aren't in cooling mode for running some air from outside to the shop, so we want a switch that can manually trigger the relay that will be controlling the air handler.

According to Everrett, the AC in the shop froze up sometime between mid june and late april 2014. Eric Stein noted that the switch box on the bottom of the shop AC was open in mid june. That's probably not good. Presumably, nobody read the HVAC wiki page before trying to do things with HVAC. For shame!

Notes from service call 2014/07/09

Service was provided by "My Guy HVAC" They were on time and professional. The only issue was the technician struggled a little with the unconventional connections in the shop system. The were working on a flat service fee so no extra cost was incurred because of his confusion.

Above notes are accurate except there is no thermostat at all and the unit doesn't' supply outside air. The unit on the roof is wired for cooling only. Connect the small (22ga?) red wires to the left of pp1-1 to trigger the contacter for the compressor on the roof. There is no control board for the air handler and the blower is wired directly to the switches. The switches on the bottom of the air handler are each switching one leg of the 240v circuit for the blower. This should be changed to a DPST switch at a minimum. A disconnect would be better. The blower circuit is taken from 2 legs of the 3 phase circuit used for the compressor. This is a potential safety issue. As well as confusing as one would expect a separate breaker for the blower. The service tech indicated that the unit is low on refrigerant, estimated 2-3 lbs. Due to the other issues, I chose not to have the the refrigerant topped off at this time.The unit uses R-22 refrigerant.

My recommendation is that we leave the unit alone unless or until there is a 24v control added to the blower, a separate circuit with a disconnect is run to the blower and a filter setup is arranged.

Here is a photo of the spec plate on the rooftop unit (To be added)

Upstairs

There is an HVAC unit in the comms/hvac closet upstairs near the side stairs.

Unit in utility closet:

• Brand: International Comfort Products Corporation
• Model: FBF100F14A4
• Mfg No: NTG3100GFA4
• Serial No: L0114187076
• manual

Rooftop Unit:

• Brand: Heil
• Model: NACO36AKA1
• Serial No: L011404663

Note from service call 2014/07/09

Service was provided by "My Guy HVAC" They were on time and professional.

Unit was low by 3 lbs of R-22 refrigerant. Likely has a small leak. Unit was inspected and topped off. Recommended that we change the filter every 60-90 days.

Notes from service call 2015/06/10

Service was again provided by "My Guy HVAC". Inspected electric and coil, looked clean and good. Checked filter, cycled inside. Filter needs replacing. They added 2 lbs R-22 refrigerant to get it back up to pressure. Cycled the system. They added a can of Easy Seal to hopefully seal the leak, but they cannot provide a guarantee that it will work. We will know for sure if it worked by next year. If it did not work, we can just continue to top off the refrigerant every year, which will probably cost about $200-$300 per year. This is considerably less expensive than buying a new unit, I think. This time they recommended that we change the filter every 30 days. I'm gonna pick up a few from Home Depot later today.

Heating Zones

The upstairs and the downstairs are the 2 separate heating zones.

Upstairs

The thermostat is by the closet across from the top of the front stairs, in the craft area. The heat and cooling are in the closet.

Downstairs

The room in the back left corner of the main room (looking toward the back of the building) contains our boiler and our hot water tank.

The thermostat is located in the metal shop area. The non-functioning wifi thermostat was replaced by a "dumb" thermostat in the fall of 2014. This thermostat controls heat in the shop area.

The front room has a thermostat near the safe. This system is independently controlled by the same boiler system in the boiler room. This thermostat ALSO controls radiator pipes upstairs. Setting the thermostat high in the lounge can make the upstairs area very warm, be aware.

Outside air exchange

Shop

Fresh air intake

There is a large powered air intake mounted above the boiler room and the hot metal area. The landlord indicated (7/1/14) that this system needs to be operational to satisfy city inspection. The electrical circuit (3 phase) for this unit was disconnected and the 240v portion was relocated to the compressor. In addition, the wiring from the disconnect to the magnetic motor starter was removed. This probably occurred shortly after we occupied the building. The disconnect immediately below the motor was relocated to the mill 2/14. The heating feature of this intake was disconnected by the landlord prior to our arrival.

Failure to make this operational may result in fines.

Exhaust

Roof vents

2 powered vents. Switched at the back of the shop by the electrical panels.

The south unit is not operational and needs diagnosis and repair. 7/9/14 with the switch on a humming noise could be heard on the roof. I suspect a stuck fan or a belt issue. The mushroom cap on the roof can be removed with an adjustable wrench for access.

The north unit is operational and seems to be thermostatically controlled (not verified). Unknown size or capacity.

Laser. 4", current cfm unknown. 80cfm or so.

Cold metal 10"?

Central shop 10"?

Wall vents

Catwalk 4"

North wall. 4" DO NOT USE! It is a code violation to vent in this manner.

Boiler Room

Powered exhaust, north wall. Switched in proximity. Near the compressor.

Automatic fresh air intake. East wall.

Maintenance

Some of our HVAC systems require regular maintenance.

Pumps

In the boiler room the two red pumps that force hot water for radiant heat in the front room and the shop area. These pumps have three ports for oil lubrication. The two ports on either side of the pump get 3 drops of oil each, the covered port over the bearing needs one strong squirt. This needs to be done annually. This was last preformed 2015-04-01.

Filter

The furnace upstairs has a filter that will need to be changed every 3 months. Last changed 2015-04-01