Supplied By www.heating spares.co Tel. 0161 620 6677
5
COMMISSIONING & TESTING
FILLING THE WATER SYSTEM
5.1
Before commissioning the appliance, the whole gas installation
including the meter MUST be purged and tested for gas tightness in
accordance with BS 6891: 1988.
Open all doors and windows, extinguish naked lights,
and DO NOT SMOKE whilst purging the gas line.
!
Before commencing the commissioning procedure, ensure that the gas
service cock is turned on, the electricity supply is isolated, and that the
CH and DHW pipe-work (where fitted) is complete. A special feature of
the CBX appliances is that the water systems can be completely filled
prior to fitting the appliance. It is recommended that this procedure be
followed even when the appliance is to be fitted immediately after filling
the system. Fill the water systems by following the procedure detailed
below steps 1 to 5, and referring to Figure 17.
It is recommended, where possible, to flush the CH
system without the appliance fitted, to avoid debris
and flux blocking the waterways within the
appliance.
17
COMMISSIONING THE WATER SYSTEM
CH RETURN
COLD
WATER IN
FILLING
LOOP
VALVE GAS
SUPPLY
DHW
FLOW CH
DRAIN
CH
FLOW FILLING
LOOP
FILLING
LOOP
VALVE
CONDENSATE
WASTE
OUTLET
(NOTE: TRAP
PARTS FITTED
INSIDE BOILER
NOT ON
PLUMBING JIG)
CH RETURN
CONDENSATE
WASTE OUTLET
(NOTE: TRAP PARTS
FITTED INSIDE
BOILER NOT ON
PLUMBING JIG)
SECONDARY
RETURN FROM
TANK (OPTIONAL)
CH
FLOW
GAS
SUPPLY
CH
DRAIN
1)
Check that the CH flow, return, (and DHW return on SBX appliance
if used), isolating valves are in the open position.
2)
Fill the system with water using one of the approved methods
described in section 3.7 to about 2.0 bar, (filling loop provided on
CBX appliances). Vent the system via the radiator valves and system
air vents in accordance with normal practice. Ensure that all system
air vents are closed.
To aid venting, a manual air vent is provided on the
LHS of the heat exchanger, and an automatic air vent
on the pump assembly.
3)
Check the system for soundness.
4)
Check the operation of the pressure relief valve (Figure 18) by lifting
the lever on the valve gently to ease the valve off its seat. Checking
that water is discharged, release the lever and ensure that the valve
seats correctly and does not leak.
Do not use the pressure relief valve to drain the
system, because dirt or debris could prevent the
valve seating correctly. If the valve leaks or sticks
closed, then replace it.
5)
Drain the entire system to flush out any debris, and refill to 0.2 bar
above the system design pressure (between 0.5 and 1.5 bar) by
repeating the above procedure. Follow the commissioning
procedure described below, and then repeat this instruction with
the system hot. It is recommended that the system be cleaned with
a recognised system cleaner such as Fernox or Sentinel.
6)
On CBX appliances, open the DHW inlet valve and operate each hot
water tap in turn to clear all the air from the pipes and the
appliance.
7)
Remove the pump cap; use a screwdriver to rotate the pump shaft.
Replace the cap.
8)
Disconnect the filling loop from the system.
9)
Prior to lighting the appliance to check the gas rates, the central
heating system should be checked for circulation by operating the
appliance with the gas turned off, this is to ensure that no air locks
occur. The appliance may go into ignition lockout and require
resetting.
18
PRESSURE
GAUGE
CAPILLARY
PRESSURE
RELIEF
VALVE
21
751030 MANUAL (NEW) 21/9/10 08:44 Page 45
