ERM5220R EQUIPMENT REMOTE MODULE
3 33-00205—01
COMPATIBLE PRODUCTS
NOTE: The ERM5220R may only be used with the thermostats listed below. Look for this
image on these products.
If you no longer have the thermostat or EIM packaging, verify thermostat model and manu-
facture date are compatible with ERM. The date code of thermostat (and EIM, if used) must
be 1546 or above
(more recent). Compatible models of thermostat and EIM are listed in
Tables 1 and 2. If your thermostat pre-dates ERM compatibility, see the info on Older Models,
below .
* Date code of thermostat (and EIM if used) needs to be 1546 or more recent (larger number).
Older Models
If the EIM/thermostat date code is smaller (older) than 1546:
• 2.0 or later versions of Prestige IAQ and RedLINK Vision-PRO thermostats can be used if you update the software on the
thermostat.
• The software update page is https://thermostatsetup.honeywell.com/en-US/SoftwareUpdates/Pages/default.aspx
This page has updates for both Prestige IAQ and RedLINK VisionPRO. Prestige is updated via USB stick; VisionPRO is
updated via microSD card.
• Prestige 1.0 models can not be updated.
• The EIM (if used) can not be updated and must be replaced.
NOTES:
— Only two ERMs can be enrolled in a system at one time – one in Boiler mode and one in Compressor mode.
— ERM is not supported by systems using a forced air zone panel, even if the thermostat is wired to the zone panel
or linked to an EIM. (See the FAQ on page 27 for more on this).
— For Boiler applications, the thermostat must be configured for radiant heat.
— ERM will not support series 20 operation in boiler applications unless a relay is used (page 12). When
configured for radiant heat the Y relay shall be off at all times.
— Prestige IAQ always requires a THM5421R EIM. The ERM can be used in conjunction with the EIM for forced air
systems. The ERM would not be used with a Prestige IAQ on heat only systems without fan.
Table 1. ERM (equipment remote module) and kits including the ERM.
ERM5220R1018 Equipment Remote Module (ERM)
YERM5220R8321 Kit with THM5220R1018 ERM and RedLINK-enabled TH8321R1001 VisionPRO thermostat
YERM5220RVPEIM
Kit with THM5220R1018 ERM (Equipment Remote Module), RedLINK-enabled TH8321R1001
VisionPRO thermostat and THM5421R1021 EIM (Equipment Interface Module)
Table 2. Compatible models.
VisionPRO Redlink
thermostats numbers Prestige thermostat and thermostat kit numbers EIM and EIM kit numbers
TH8110R1008* Thermostat THX9421R5021* Thermostat THM5421R1021* EIM
TH8320R1003* Thermostat YTHX9421R5085* Thermostat + EIM + Delta-T sensors
TH8321R1001* Thermostat YTHX9421R5101* Thermostat + EIM +
Wireless outdoor sensor + Delta-T sensors
YTHM5421R1010* EIM +
Delta-T sensors
Table 3. Other accessories.
Model Note
C7189U1005
10K ohm indoor sensor used as a backup on boiler applications.
If the stat fails for more than 30 minutes , it will maintain the system at 55 °F in heating.
C7089U1006
10K ohm outdoor sensor used with outdoor unit ERM5220R installations to display outdoor
temperature at thermostat.
C7089R1013 Wireless outdoor sensor
THM6000R1002 RedLINK Internet Gateway (RIG)
REM5000R1001 Portable comfort control
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