Specifications

JGS Underfloor Heating Warm Up Protocol Jan 2005 page 2 of 2
C. Initial Heating-Up Procedure of the Floor Heating System (EN 1264 Part 4, Para 4.4)
The warm up procedure should be carried out using natural infiltration and after switching-off all other
heating, all external doors and windows should be closed.
1. Ensure all heating circuits are filled with cold water and vent the system well using the standard
radiator style vents on the JG Manifold.
2. Fully close the JG Pump pack valve by turning the hand wheel clockwise.
3. Switch on the pump by turning all room thermostats to maximum.
4. Set the flow rate in the underfloor heating circuit to 4 l/min by adjusting the flow gauges on the
manifold.
5. Set the temperature limiter thermostat to 35°C (10°C above the initial target flow temperature
of 25 ºC)
6. Gradually open the Pump pack valve by turning the hand wheel anti-clockwise while monitoring the
flow temperature on the thermometer. This process may take approx. 10 minutes to commence in
order to take the inertia of the thermometer into account.
7. Gradually open the valve until the target flow temperature of 25 ºC is reached. It should be noted
that until the flow temperature reaches 47ºC, when the automatic injection valve takes over, the
controller only operates mechanically in the lower temperature range (25 ºC - 47ºC).
In other words, the flow temperature of the boiler must be constant (opening the valve limits the flow
rate in terms of volume and not temperature-dependent).
Use of the temperature limiter is essential (for safety reasons)
8. After the initial temperature is reached adjust the flow rate in the underfloor heating circuit to 2 l/min
9. The initial water flow temperature shall be maintained at 25ºC for 3 days.
10. On the 4
th
day the temperature can be increased gradually in increments of 5ºC/day until the
maximum design temperature is reached and must be maintained for a further 4 days at maximum
design flow temperature. Adjusting the hand wheel anti-clockwise does this. The overheat thermostat
should also be adjusted at this time to maintain a 10ºC difference. ie when the flow temperature is
40ºC the safety thermostat should be set at 50ºC.
11.
When completed Speedfit recommend the room thermostats are adjusted to desired working levels
and the system operated normally for approx 2 weeks until final balancing, commissioning and
setting of circuit flow rates is carried out.
If Initial heating-up process was interrupted give details?
Please confirm the warm-up procedure was carried out in accordance with above by counter signing below.
John Guest Speedfit Limited
Horton Road, West Drayton, Middlesex UB7 8JL, England
Tel: [phone] Fax: [phone]
Name (Print) Name (Signature) Date
Installer
Client / Clients
Representative
JG Speedfit
(if present)