Bosch CRC200 User manual

1
Part No. 7738111034Bosch CRC200 + Outdoor Reset (with Third-Party Controls) Quick Start Guide
Bosch Thermotechnology Corp.
BTC 465103301 A | 04.2021
The Bosch CRC200 (part number 7738111034) is an optional controller that can
enhance boiler operation when used with third-party controls to manage all zones.
The CRC200 controller is necessary for enabling outdoor temperature reset control; it
replaces the discontinued Bosch FW200 controller.
This guide is intended ONLY for quick start of outdoor reset when used with
a third-party zone/thermostat system.
1 Installation
Make all wiring connections before powering up the boiler. Install the CRC200
controller near the boiler using the included base. Do not mount the CRC200 in the
living space when a non-Bosch thermostat or zone controller is managing all zones.
Manufacturing date code of CRC200 must be 960 (Dec. 2019) or newer.
Control Wiring
The terminal strips vary on wall vs. floor models. Wall boiler terminals are inside the
Heatronic control panel; floor terminals are in an electrical box on the rear of the
boiler. Refer to figures 1 and 2 below.
Terminals “BB” (BUS1) are for Bosch accessories only: CRC200, CZM100,
CT100
Terminals “2 & 4” (TT2) are thermostat/zone box dry contacts dry contacts
for all third-party controls
Terminals “A & F” (Out Sen3) are for the Bosch outdoor temp sensor kit (PN
87472071010)
Figure 1
B B 4 2 F A
Greenstar Wall Boiler
Figure 2 Greenstar Floor Boiler
1. Connect the CRC200 to terminals “BB” on the wall boiler (BUS1 on the floor
boiler) using 18-2 wire, not longer than 100 ft.
2. Remove the jumper from terminals 2 & 4 (TT2) and connect the third-party
thermostat or zone controller here. Note: The Greenstar will not run if the
jumper is removed and nothing is connected to 2 & 4 (TT2). Terminals 2 & 4
(TT2) take priority over “BB” (BUS1), but they work together to manage the
boiler & zones when using outdoor reset.
3. Connect the outdoor temperature sensor to “A & F” (Out Sen3) on the boiler.
4. Open the temp sensor housing using a screwdriver; pry gently to avoid damage.
Once wired, install it on the north wall of the building, away from all heat sources
& sunlight. The temp sensor must be connected to the boiler or the CRC200 will
not display the outdoor reset menu during setup.
Configuring the CRC200
Figure 3
Press the “back" button to redo the last step or last data entry if
needed).
1. Language selection appears. English (EN) starts flashing. Press the dial to
confirm, or rotate the dial to the desired language and press to confirm. If the
CRC was already programmed, skip to step 14.
2. Date appears. Turn the dial to set month/day/year, and press dial to accept each
field.
3. Time appears. Turn the dial to set the time (hours/minutes) and then press the
dial to proceed.
4. Heating zone (HC) assignment appears. Press the dial to confirm the setting of
“HC1”.
5. Auto Config. appears. Turn the dial and select “Yes”. Wait a few seconds while
the CRC200 searches for connected devices. The menu will automatically move
to “DHW” menu when configuration is finished (or directly to LLH menu if it is a
combi boiler).
6. DHW appears (for heat-only boilers; DHW is not displayed on combi models).
Turn dial & select the right choice for your system (Yes, pr. pump, 3-way valve,
no DHW).
7. LLH appears. Select “Yes on Mod.” for the included supply temp sensor, or “No”
if no sensor exists.
8. Recirculation appears. Select “No”.
9. Heat system appears. Select “low temp” for in-floor radiant, “high temp” for
radiators or baseboards.
10. Design temp appears. The defaults shown in the chart below are 113℉ for low
temp and 167℉ for high temp systems. Adjust the set points as needed for your
specific application. You will set the correct outside temp for your region later in
this quick-start guide.
CRCDefaults LowTemp. HighTemp.
Outside temperature 14 °F 14 °F
Design temperature 113 °F 167 °F
Max. supply temperature 118 °F 167 °F
Table 1

Bosch CRC200 + Outdoor Reset (with Third-Party Controls) Quick Start GuidePart No. 7738111034
Bosch Thermotechnology Corp.
BTC 465103301 A | 04.2021
2
11. Max supply temp appears. Defaults are in the chart above. Set for the maximum
heating temperature of the boiler. This setting does NOT reduce DHW output for
a combi boiler or indirect tank.
12. Frost protect appears. Set to “by room” to prevent system freezing; the boiler
will run automatically when indoor air temp falls below a default temp of 41℉.
13. Heating start appears. Select “Yes” and press the dial, and the main menu
appears.
Configuring Outdoor Temp Reset
1. Activate the hidden service menu by pressing the “Menu” button for 3 seconds;
then press the dial to confirm entering the service menu.
2. Turn the dial to select “system data” and then press dial to confirm.
3. Heating zone (HC) assignment appears. Turn the dial to get to “Control type” &
press dial to confirm.
4. Select “External simple” and press dial. This is the default outdoor reset program
built into the controller.
5. Turn the dial & scroll past a few other menu items to select “Min Outside temp”;
press the dial to confirm.
6. Turn the dial & press to set the outdoor design temp for your area; see chart
below (or look up temps online for your coldest average city temperature).
Cities DesignTemp.
Seattle/Portland 20 °F
Boston/New York/Washington 0 °F
St. Louis/Kansas City 0 °F
Chicago/Detroit/Buffalo/Montreal -9 °F
Denver/Salt Lake City -15 °F
Minneapolis/Fargo/Green Bay -20 °F
Table 2
7. Press the dial to confirm the setting.
8. Press the “back” button three times to exit setup.
9. Turn the dial to 70℉ and press “Manual” mode; do not leave it in “Auto” mode.
The CRC200 uses 70℉ indoor temp as a default for outdoor reset, even when
not used as a thermostat in conditioned space
The CRC200 will now control outdoor temp reset. The third-party thermostats and
zone controllers on terminals “2 & 4” (TT2) will control the zone(s). The CRC200
configuration is complete.
The CRC200 can also be used with other Bosch NSC controls (CZM100, CRC100) to
manage up to 8 zones without the need for third-party controls. The CRC200 can be
used as a programmable room thermostat in a single zone home; it can perform simple
or optimized outdoor reset, indoor reset, or a combination of indoor and outdoor
reset if desired. It will display fault and system messages from the boiler. Contact your
distributor or Bosch for more details.