Difference between revisions of "Heating"

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(Heating)
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== Heating ==
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Ujima House has a central heating system, operated and maintained by the landlord. Hot water is pumped from the boiler house located on the roof to the various radiators, most of which are finned tubes in vented enclosures, looped around the edges of the building.
  
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=== Current Configuration ===
  
Motor seems dead, [[User:mentar|mentar]] took it apart and connected it to the mains to make sure it was the motor that wasn't working, which was confirmed.
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The heating appears to come on intermittently throughout the day. At the time of writing its not clear if its on a schedule, a thermostat elsewhere in the building controlled by the landlord, or if there is a fault. The Hackspace is always warm enough, so its yet to be an issue.
[https://www.dropbox.com/sh/6sagaenhghakcg6/r6_uE1lVzB Drop box photos]
 
  
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The thermostats are all configured to be 18°C which may be a little conservative - we'll see how it goes.
  
The motor is a bit of a puzzle :
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=== Ground Floor ===
  
Old wiring appears to be three-phase, but the current motor, which looks fairly new, is single-phase.
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To be confirmed
  
The motor is numbered  1.541TPCB3, which doesn't appear to correspond with the parts listed at http://www.tecmotors.co.uk/ though TPC is one of their designations.
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=== First Floor ===
  
The exact same motor is listed at http://www.engineersmate.com/products/SINGLE-PHASE-MOTORS-230V/1-5KW-4-POLE-FOOT-MOUNT-230V-1PH-PERM/P239654
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==== Diagram ====
  
The wiring diagram inside the connection cover appears to show a capacitor-start motor with a centrifugal switch, but there is no obvious switch. It would be reasonable to assume some of the internal wiring is to a switch, but the connections shown are open circuit. Furthermore, if they were to a switch, it would turn the motor off once it got to speed.
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[[File:Ujima_heating.jpg|800px]]
  
I'm guessing (maybe over-guessing) that there was previously a 3-phase motor installed and it has recently been replaced by this one, possibly bought from the engineer's mate website as part of surplus custom stock. It is thought to have worked for a while, and it isn't clear why it no longer works. Other documents on the TEC website show a different wiring for similar motor types, suggesting the wiring on this one may be unusual (perhaps it should have an external centrifugal switch?) or wrong.
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==== Zones ====
  
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In all 4 corners of the first floor there's a basic controller attached to the wall, which controls a solenoid valve. These are paired with a wireless thermostat.
  
Possible solutions :
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From each corner a heating loop runs along side the wall.
  
Short, expensive solution - get a heating engineer to fix it.
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==== Thermostat Locations ====
  
Less expensive solution - buy a replacement motor from the boiler manufacturer and restore the wiring to original
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{| class="wikitable"
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! Zone
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! Location
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! Type
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|-
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| NE
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| On the internal wall at the front of the class room, next to the whiteboard
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| Digistat RF1 (Temp only)
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|-
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| SE
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| In the alcove between the shelving units and the wall of the main hacking area.
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| Digistat RF2 (Basic Scheduler)
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|-
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| SW
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| Near the first aid kit by the front door.
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| Digistat RF2 (Basic Scheduler)
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|-
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| NW
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| Located in the secure storage cupboard - currently on a shelf.
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| Digistat RF2 (Basic Scheduler)
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|}
  
Other possible solutions
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[[Category:Premises]]
 
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[[Category:Infrastructure]]
- buy another motor from engineersmate and fit it, hope it lasts longer than the previous one.
 
 
 
- take the existing motor to a motor repairer (there's one near Old St) and ask for an expert opinion on it
 
 
 
- buy a 1.5kW single phase motor with the correct shaft / pulley and fit it. Check that the previous repair has actually provided single phase power (with neutral) and isn't running the motor across two phases
 

Revision as of 00:48, 24 January 2019

Ujima House has a central heating system, operated and maintained by the landlord. Hot water is pumped from the boiler house located on the roof to the various radiators, most of which are finned tubes in vented enclosures, looped around the edges of the building.

Current Configuration

The heating appears to come on intermittently throughout the day. At the time of writing its not clear if its on a schedule, a thermostat elsewhere in the building controlled by the landlord, or if there is a fault. The Hackspace is always warm enough, so its yet to be an issue.

The thermostats are all configured to be 18°C which may be a little conservative - we'll see how it goes.

Ground Floor

To be confirmed

First Floor

Diagram

Ujima heating.jpg

Zones

In all 4 corners of the first floor there's a basic controller attached to the wall, which controls a solenoid valve. These are paired with a wireless thermostat.

From each corner a heating loop runs along side the wall.

Thermostat Locations

Zone Location Type
NE On the internal wall at the front of the class room, next to the whiteboard Digistat RF1 (Temp only)
SE In the alcove between the shelving units and the wall of the main hacking area. Digistat RF2 (Basic Scheduler)
SW Near the first aid kit by the front door. Digistat RF2 (Basic Scheduler)
NW Located in the secure storage cupboard - currently on a shelf. Digistat RF2 (Basic Scheduler)