Schwank ThermoControl Plus 2 - Manual (Page 23)

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6.5 Zone Configuration – Two Stage Tube Heaters
For two-stage tube heaters: All heater zones are set up as two-stage only. Pairs of controller
outputs control low and high fire. The location of the jumper in P3 establishes two two-stage zones.
A 100VA 120V/24V transformer is supplied to power the controller, and eight 24Vac external relays
are also supplied. Additional field supplied items required for EACH two-stage zone: Qty 1 x 100
VA 120V/24V transformer; Qty 2 x external zone relays (one Low-stage + one High-stage); Qty 2
per heater in zone x external heater relays (one Low-stage + one High-stage).
Refer to configuration diagram above and the wiring diagram for two-stage tube heaters in Section 8.
6.6 Zone Configuration – Luminous (high intensity) Heaters
A luminous heater has a 24Vac ignition control module and gas valve. While individual heaters are
single-stage, heater zones can be set up as single-stage, or two-stage. Two-stage zones have a
proportion of the heaters on low-stage, with the balance of the heaters in the zone on high-stage.
The quantity of luminous heaters in a zone is typically limited by: the dimensional size of the zone;
capacity of exhaust fan to satisfy the total input of the zone.
The location of the jumper in P1 … P5 determines the quantity of single-stage and two-stage
zones. For single stage zones, zone relays (eight supplied) switch line voltage to field supplied
DO NOT USE
FAN OUTPUTS
(SEE SECTION
5.2)
FAN OUTPUTS
FOR TWO-
STAGE
LUMINOUS
ONLY