Hvac

heat pump stuff now located at e://onedrive/jupyter/energy

https://www.obiecomfortsolutions.com/company-obie-comfort-solutions/

Air distribution basics

maintenance/repair

11/5/21

problem: tstat lights were on but zone valve lights were off. End switch was not being activated for LR and TV (intermittent)

• replaced LR zone valve with new, voltage between terminal 1 and 3 was low
• replaced TV zone valve with clip salvage, voltage between terminal 1 and 3 was low
• ordered spare from ebay. Still have one clip salvage 2nd shelf near boiler. Replaced valves are on top shelf, have tape folded back to indicate they were replaced.

https://mckwiki.parleyvale.com/images/f/f6/SelectingCirculators.pdf

boiler

Lochinvar 120000 BTU

service 9/12/2019

Suburban Service Westwood 781-769-6694 2hrs $338 $169/hr

esp8266 hvac controller

3/8/

Soldered DHT11 onto an esp8266 to monitor attic humidity.

For the firmware in fs/www/iot/pio/pio-ardui/espboth/secstidif created config and saved as CONFIG_CYURD117attic_hum.cpp/h. Tricky bit was

3/7/22

replaced 700ma power supply with 2A (10W)

2/24/22

TODO problem with 74(mb) and 75(peri), furthest away devices. Constant wrong low readings followed by correct readings try new power supply first

Supply for the six 8266's and 7 relays blew today, flashing on and off. Replaced with same kind. It lasted since 11/19, 2 1/2 years, when that disastrous upgrade happened while I was sick from derm drug.

max power esp8266 170ma * 7 = 1672ma power for 8 relays

The "L" in SRC-05-SL-C means 0.36 Watts. Since Watts is Volts times Amps we can divide by Volts to get Amps:

0.36 / 5 = 0.072 = 72 mA per coil. * 8 = 575 mA

total power needed: 1672ma + 575ma =2247ma NOT 700ma

1/24/22

The design embedded in the wooden plates for all but the living room uses a tiny pcb soldered right to the esp8266 with the sensor haging out so as not to be overheated by the chip. This KICAD esp82single design can use espboth/secstidif with a CONF_CYURD074hvacMB.cpp like configuration. All other fixes should use this version. Flaky devices are the master bedroom and peri's study. For the master bedroom, re'flashing brought it back to life. Had trouble flashing. Turns out I tried 3 bad usb cables in a row so I thought it was windows 11. You can check for a working connection in DeviceManager. view/show_hidden_devices. CH340 is the driver for esp and I plugged it into CYURD001 and its listing under PORTS changed from greyed out to dark when a good cable/connection was in play.

current design

code and spec file in d://fs/www/iot/pio/pio-ardui/espBoth/secstdif