Direct Vent Tankless Water Heater - Rinnai

Connecting Multiple Water Heaters
The EZConnect cable is an optional accessory
that connects 2 water heaters and allows them to
function as one hot water source.
The MSA-2M and MSA-2S packs are optional
accessories that connect 2 to 5 water heaters
and allow them to function as one hot water
source.
Refer to the instructions that come with the
accessory for complete installation information.
Guidelines
• Do not install both the EZConnect and the
MSA packs because they are not designed to
operate together.
• Water heaters connected with the
EZConnect Cable or the MSA-2M and MSA-
2S packs cannot be used for the bath fill
function.
• Water heaters should be installed less than 18
inches apart so that the cables will reach
between units and to prevent temperature
fluctuations (cold water sandwich effect) when
the water is shut off and turned back on.
• Temperature settings can only be changed on
the controller for the primary unit. (This
changes the temperature on all units within the
MSA or EZConnect system.)
High Altitude Installations
Set switches 2 and 3 to the values shown in table
below for your altitude. The default setting for the
appliance is 0-2000 ft (0-610 m) with switches No. 2
and No. 3 in the OFF position.
0-2000 ft
(0-610 m)
2001-5200 ft
(610-1585 m)
34 VB Series Indoor LS Manual
Number of
Connected
Accessories Necessary:
Water Heaters:
2 (1) EZConnect Cable or (1) MSA-2M
3 (1) MSA-2M and (1) MSA-2S
4 (1) MSA-2M and (2) MSA-2S
5 (1) MSA-2M and (3) MSA-2S
WARNING
5201-7700 ft
(1585-2347 m)
DO NOT adjust the other
switches unless specifically
instructed to do so.
7701-10200 ft
(2347-3109 m)
Switch No. 2 OFF OFF ON ON
Switch No. 3 OFF ON OFF ON
Switch No.
O
F
F
ON
1
2
3
4
5
6
7
8
Activation Options for EZConnect
One unit in standby allows for quicker activation time with
flow rates within the capacity of a single unit.
Two units in standby allows for quicker delivery temperature
for flow rates requiring both units.
Applicable for the RL75 and RL94 models only.
Switch No.
O
F
F
Model
RL75,
RL94
ON
1
2
3
4
5
6
7
8
Number of units
in standby
Switch No.
O
F
F
ON
1
2
Position of switch No. 5 in
bank of 6 switches
1 ON
2 OFF (default)
3
4
5
6
7
8
Switch No.
O
F
F
ON
1
2
3
4
5
6
7
8