Adjusting The Fixed High Limit (If Required); Changing The Adjustable High Limit (If Required) - Viessmann VITOTRONIC 100 GC1B Installation And Service Instructions Manual

Vitotronic 100, GC1B Installation and Service
Adjusting the Fixed High Limit
Fixed high limit
Adjustable high limit
Coding address for the electronic maximum temperature
limit of Vitotronic 100;
set coding address 06 (see boiler coding section) to the
temperature as shown or less
Changing the Adjustable High Limit
Legend
A Rotary selector
B Break required tab
or
C Break required tab
(if required)
When adjusting the fixed high limit, the adjustable high
limit and the electronic temperature limiter must also be
adjusted (see chart below).
WARNING
Disconnect power to the control and burner!
1. Unclip the fuse box and swing upwards.
2. Turn the slotted screw on the rear of the fixed high
limit until the slot points to desired temperature.
3. Re-fi t the fuse box.
Non-condensing boiler
(VD2/VD2A) °F (°C)
Factory set at;
230°F
(110°C)
212°F
(100°C)
200°F
(93°C)
(if required)
Note: Excessive DHW temperatures can damage the DHW
tank. If the system is operated in conjunction with
a DHW tank, ensure that the maximum permissible
water temperature of the tank is not exceeded. If
necessary, install suitable safety equipment for this
purpose.
1. Remove rotary selector A.
2. Using a pair of pointed pliers, break the restraining
tab B or C out of the stop dial as shown.
3. Install rotary selector A. Turn rotary selector A to
the required temperature. The slot should line up to
the selected temperature.
Installation Sequence
Adjustable to;
210°F 248°F
(99°C) (120°C)
203°F 230°F
(95°C) (110°C)
188°F 223°F
(87°C) (106°C)
Condensing
boiler
(CT3) °F (°C)
Factory set at;
210°F
(99°C)
203°F
(95°C)
188°F
(87°C)
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