Heating: Difference between revisions

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== Heating ==
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 ===


Ducting fan 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.
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]


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 :
=== Ground Floor ===


Old wiring appears to be three-phase, but the current motor, which looks fairly new, is single-phase.
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.
=== 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
==== Zones ====


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.
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.


I'm guessing that it's not a centrifugal switch, but a thermal fuse. So the mains input is actually on Z2/U1 as shown on Tec's data sheet, but goes via V1/V2 to match the cover diagram. The fuse has expired for reasons unknown.
From each corner a heating loop runs along side to the mid-point of the longer wall.


==== Thermostat Locations ====


Possible solutions :
{| class="wikitable"
 
! Zone
Short, expensive solution - get a heating engineer to fix it.
! Location
 
! Type
Less expensive solution - buy a replacement motor from the boiler manufacturer and restore the wiring to original
|-
 
| NE
Other possible solutions
| On the internal wall at the front of the class room, next to the whiteboard
 
| Digistat RF1 (Temp only)
- buy another motor from engineersmate and fit it, hope it lasts longer than the previous one.
|-
 
| SE
- take the existing motor to a motor repairer (there's one near Old St) and ask for an expert opinion on it
| In the alcove between the shelving units and the wall of the main hacking area.
 
| Digistat RF2 (Basic Scheduler)
- buy a 1.5kW (or bigger ? perhaps it's undersized) single phase motor with the correct shaft / pulley and fit it.
|-
 
| SW
 
| Near the first aid kit by the front door.
Things we've checked :
| Digistat RF2 (Basic Scheduler)
 
|-
Looking at the motor connections on the cover diagram, it's apparent that mains power must flow into V1 for any effect at all. But this connection has a high resistance to all other pins. It's either a burnt out winding, or possibly a thermal fuse.
| NW
The capacitor appears to be fine
| Located in the secure storage cupboard - currently on a shelf.
 
| Digistat RF2 (Basic Scheduler)
There is a [http://www.tecmotors.co.uk/sites/default/files/WIRING%20DIAGRAMS.pdf wiring diagram] on the Tec website for capacitor-run motors which does not use the unconnected V1 pin. Perhaps this is the correct wiring ? The motor might still work if connected that way, but with no thermal protection. This would not normally bother me, except that it's already blown once and might overheat again. And we want it to run automatically for long periods inside a gas boiler in a screwed-together cabinet in a locked room, so no bodgery please.
|}
 
Paddy has confirmed that the motor will run if the thermal switch is bypassed.
 
TEC (the motor manufacturers / importers) have confirmed that the schematic on the box lid is wrong and their diagram (above, as tested by paddy) should be used.


[[Category:Premises]]
[[Category:Premises]]
[[Category:Infrastructure]]
[[Category:Infrastructure]]

Revision as of 00:23, 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

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 to the mid-point of the longer 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)
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