Zone Controls for Heating Flashcards
What is a zone?
A section of a building, heated or cooled, controlled by a thermostat.
What are 3 reasons to zone a house?
- To have more control over the temperature of each room in a house.
- To make a house more comfortable.
- To save money on heating or cooling.
Zoning can be done with what types of heating systems?
- Hot Water baseboard
- Steam
- Hot air
When zoning with circulators, each zone needs what 4 things?
- a separate circulator
- a flow check valve
- a relay
- thermostat
Zoning with zone valves:
Each zone needs 3 things:
- a zone valve
- a thermostat
- one circulator (properly sized)
Zoning with zone valves for 3 or more zones:
Each zone needs 4 things…
- a zone valve
- a thermostat
- one circulator (properly sized)
- a 24 volt 40 VA transformer (Transformer properly sized for all zones connected)
Relays are used for what?
to energize the circulator and burner circuits
RA 832A is used for what type of systems?
millivolts systems
RA 845A is used for what type of systems?
24 volt systems
Multiple zones are best controlled by ________?
a relay pack
RA 832A Relay Connections:
T-T connects to ____
X-X connects to ____, and what kind of switch?
1-2 connects to ____
2-3 connects to ____, and
(Which is hot and which is neutral?)
2-4 connects to ____
and (Which is hot and which is neutral?)
1-3 are ____ contacts and connect to ____ volts.
1-4 are ____ contacts and connect to ________ volts.
RA 832A Relay Connections:
T-T to thermostat
X-X to T-T on Aquastat and is an end switch
1-2 to 120 volt power system
2-3 to circulator
(2 is neutral, and 3 is hot)
2-4 to optimal load 2nd load,
(4 is hot, 2 is neutral)
1-3 N/O connect to 120 volts
1-4 N/O connect to 120 volts
RA 845A Relay Connections:
T-T connects to
1-2 connects to
4 connects to 1 for what reason?
4 and 3 are ______ contacts.
3 connects to hot on ________ and needs a neutral from_______.
5-6 are _______ contacts
RA 845A Relay Connections:
T-T connects to the thermostat
1-2 connects to 120 volt power input
4 connects to 1 as a jumper for 120 V
4 and 3 are N/O contacts
circulator,
and needs a neutral from 2
5 and 6 are N/O contacts
Relay packs only require _________ input once.
120 volt
Relay packs have built in priority for _________.
indirect heater
Relay packs have how many zones per relay?
2-6
Relay packs with built in priority for an indirect heater serves what purpose?
To shut off all other zones to make hot water.
A relay pack has end switch contacts which get wired to _____________________.
T-T on aquastat
Erie Zone Valves:
red wires go to ______
black wires do what?
red: T-T on aquastat boiler
black: power motor through a 24v transformer
Honeywell V8043F
end switch X-X gets wired to
TH
TR
TH/TR
end switch to T-T on aquastat
TH to thermostat
TR to transformer
TH/TR may not be used unless as a splice/wirenut
