resideo R8845U Manual

R8845U Universal Switching Relay

APPLICATION

The R8845U Universal Switching Relay provides intermediate
switching of line- and low-voltage devices from a line- or
lowvoltage controller. The R8845U may be used to replace
several Resideo or competitive switching relays and is
typically applied in hydronic heating systems.

FEATURES

• Replaceable, socketed relays.
• Replacement relay common to other hydronic replacement
controls.
• Two troubleshooting LEDs.
• Push-to-test button.
• Replaceable transformer fuse.
• Low-voltage contact ratings for Powerpile® applications.
• Long-life DC relay drive control technology.
• Relays can be used with external 24 Vac or 24 Vdc supply,
line-voltage control, or with internal 24V transformer.
• One model replaces several competitor models.
• One model replaces many Resideo models: R182A,B,C,J;
R482A,B,C,J; R845A, R882A,B,C,J and RA832A. (See
Table 1, Replacement Cross Reference.)

SPECIFICATIONS

IMPORTANT
The specifications given in this publication do not
include normal manufacturing tolerances. There-
fore, this unit may not exactly match the listed spec-
ifications. Also, this product is tested and calibrated
under closely controlled conditions, and some minor
differences in performance can be expected if those
conditions are changed.
Model: R8845U Universal Switching Relay with 24V control-
ler for switching one- or two-line voltage loads and one
low-voltage load.
Electrical Ratings:
Voltage: 120 Vac, 60 Hz.
Thermostat Heat Anticipator Setting: 0.12A.
Transformer Ratings:
Primary: 120V, 60 Hz.
Secondary: 24 Vac, 12 VA maximum, 9 VA available for exter-
nal loads. Secondary protected by replaceable 1A auto-
motive fuse.
Contact Ratings: 7.4 AFL, 44.4 ALR on each set of line-volt-
age contacts; maximum connected load is 2000 VA.
Switching Action: Two Spst, plus Powerpile® rated low-volt-
age Spst. If normally closed contacts are needed, use
RA889A.
Temperature Ratings:
Ambient: -20°F to 120°F (-29°C to 49°C).
Humidity Ratings: 0 to 90% rh, non-condensing.
Electrical Connections: No. 8 captivated wire clamp screw
terminals.
Finish: Zinc plated steel.
Knockouts:
Case Bottom: Three 1/2 in. (13 mm) for conduit box.
Case Top: One 7/8 in. (22 mm) for wiring.
Approvals:
Underwriters Laboratories Inc. Listed: File no. E4436, Guide
no. XAPX.
Canadian Underwriters Laboratories Listed: Guide no.
XAPX7.

PRODUCT DATA

68-0215-02