Schwank ThermoControl Plus 4 - 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 P5 establishes four 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 below and wiring diagram for two-stage tube heaters.
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
exhaust fan and transformer in each zone. Heating zone required exhaust volume is:
USA: 4 cfm/1,000 Btuh input; Canada: 300 cfm/100,000 Btuh input. Zone transformer sizing: 40VA
first heater + 20VA each additional heater in zone.
The configuration diagrams below indicate the single- and two stage zone strategies for Jumper
positions P1 to P5. Also refer to the wiring diagram for luminous heaters.
Error Output
! See Section 6.11
Jumper Pins are
located inside the
controller to the
right side of the
battery.
Jumper position P5
establishes all two-
t h t
DO NOT USE FAN
OUTPUTS
(SEE SECTION 5.2)
FAN OUTPUTS
FOR TWO-STAGE
LUMINOUS ONLY