3
2.3
Heating battery
Warning
• Although the mains power supply to the unit has been disconnected there is still risk for injury due to
rotating parts that have not come to a complete standstill.
• Beware of sharp edges during maintenance. Use protective clothing.
• Observe that the heating battery can be hot although the power is switched of. Risk of burning.
2.3.1
Water heating battery
In units with built in water heating battery the hot water coil is located next to the supply air connection. The hot water
coil can be either HWL (hot water coil, low power) or HWH (hot water coil, high power). The coil material is copper pip-
ing with a frame of galvanized sheet steel and aluminium fins. The coil is equipped with venting and immersion sensor
for frost protection.
2.3.2
Electrical heater
In units with built in electrical heater the heating rods are located after the supply air fan in the airflow direction. The
material is stainless steel. The electric heating coil has both automatic and manual overheating protection.
The manual overheat protection is reset by pressing the button, marked RESET figure 1. The power demand of the elec-
trical heating coil is controlled by the main regulator.
The main regulator controls the heat steplessly by a TTC triac control according to the desired supply/extract or room
air temperature that is set in the control panel.
Topvex SF units equipped with Electrical heater performs 3 minutes of re-cooling after the unit have been turned of.
Note:
• If activating the fire alarm when the heater is switched on, the fan stops immediate without re-cooling,
this can cause the overheating protection to trip. See figure 1 where to reset.
• Reset of the overheat protection must be done by an authorized electrician.
• An all pole circuit breaker (safety switch) must precede the unit.
130323 | A002
Summary of Contents for Topvex SF02-S12
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