Honeywell RM7838B Series, Manual, Page: 3 / 56

3 65-0120—1
RM7838B
SPECIFICATIONS
Specifications
ELECTRICAL RATINGS (See Table 1):
Voltage and Frequency: 120 Vac (+10/-15%), 50 or 60 Hz
(+/- 10%)*
Keyboard Display Module: 13.0 Vdc peak full wave
rectified (+20/-15%)
Power Dissipation:
RM7838B: 10W maximum.
Display Module: 3W maximum.
Maximum Total Connected Load: 2000 VA.
Fusing: Total Connected Load: 20A maximum, type
FRN or equivalent.
ENVIRONMENTAL RATINGS:
Ambient Temperature:
Operating: -40
°
F to 140
°
F.
Storage: -40
°
F to 150
°
F.
Humidity: 85 percent RH continuous, noncondensing.
Vibration: 0.5G environment.
DIMENSIONS: Refer to Figs. 1, 2 and 3.
WEIGHT:
RM7838B: 1 pound 10 ounces, unpacked.
Keyboard Display Module: 4 ounces, unpacked.
IMPORTANT: A Flame Detection System that must be
ordered separately is required for operation. To select
your Plug-in Flame Signal Amplifier and matching
Flame Detector, see Table 2.
APPROVAL BODIES:
Underwriters Laboratories Inc. listed, File No. MP268,
Guide No. MCCZ.
Canadian Standards Association certified, LR9S329-3.
Factory Mutual approved, Report No. J.I.2X0A1.AF.
IRI acceptable.
Federal Communications Commission, Part 15, Class B—
Emissions.
MOUNTING: Q7800A1005 for panel mount or Q7800B1003
for wall or burner mount.
REQUIRED COMPONENTS:
Plug-in Flame Signal Amplifier (see Table 2)
Mounting Subbase:
Q7800A1005 for panel mounting.
Q7800B1003 for wall mount applications.
Plug-in Purge Timer Cards:
TABLE 1—TERMINAL RATINGS.
Terminal No. Description Ratings
G Flame Sensor Ground 60 to 220 Vac, current limited.
Earth G Earth Ground
1
L2(N) Line Voltage Common
3 Alarm 120 Vac, 1A pilot duty.
4 Line Voltage Supply (L1) 120 Vac (+10/-15%), 50 or 60 Hz (+/- 10%).
2,5
5 Combustion Blower 120 Vac, 9.8AFL, 58.8ALR (inrush).
6 Stop Input 120 Vac, 1 mA.
7 Lockout Interlock 120 Vac, 9A.
8 Interrupted Pilot 120 Vac, 4.5A ignition and 50VA pilot duty.
3
9 Main Fuel Valve 120 Vac, 2A pilot duty.
4
10 Ignition 120 Vac, 4.5A Ignition.
3
(Continued)
Timing Part Number
2 seconds ST7800A1005
7 seconds ST7800A1013
10 seconds ST7800A1021
30 seconds ST7800A1039
40 seconds ST7800A1047
60 seconds ST7800A1054
90 seconds ST7800A1062
2.5 minutes ST7800A1070
4 minutes ST7800A1088
6 minutes ST7800A1096
9 minutes ST7800A1104
12 minutes ST7800A1112
15 minutes ST7800A1120
22 minutes ST7800A1138
30 minutes ST7800A1146
* Operating frequency chosen by selecting RM7838B.